chrome/browser/ui/tabs/tab_strip_model_unittest.cc

// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "chrome/browser/ui/tabs/tab_strip_model.h"

#include <stddef.h>

#include <algorithm>
#include <array>
#include <map>
#include <memory>
#include <optional>
#include <string>
#include <string_view>
#include <utility>
#include <vector>

#include "base/containers/fixed_flat_map.h"
#include "base/containers/flat_map.h"
#include "base/containers/flat_set.h"
#include "base/memory/raw_ptr.h"
#include "base/notreached.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "base/test/scoped_feature_list.h"
#include "base/time/time.h"
#include "build/build_config.h"
#include "chrome/browser/content_settings/host_content_settings_map_factory.h"
#include "chrome/browser/ui/browser_list.h"
#include "chrome/browser/ui/browser_window/test/mock_browser_window_interface.h"
#include "chrome/browser/ui/tabs/features.h"
#include "chrome/browser/ui/tabs/split_tab_metrics.h"
#include "chrome/browser/ui/tabs/tab_enums.h"
#include "chrome/browser/ui/tabs/tab_group_model.h"
#include "chrome/browser/ui/tabs/tab_model.h"
#include "chrome/browser/ui/tabs/tab_strip_model_observer.h"
#include "chrome/browser/ui/tabs/tab_strip_model_test_utils.h"
#include "chrome/browser/ui/tabs/tab_strip_user_gesture_details.h"
#include "chrome/browser/ui/tabs/tab_utils.h"
#include "chrome/browser/ui/tabs/test_tab_strip_model_delegate.h"
#include "chrome/browser/ui/ui_features.h"
#include "chrome/test/base/browser_with_test_window_test.h"
#include "chrome/test/base/testing_profile.h"
#include "components/commerce/core/commerce_utils.h"
#include "components/content_settings/core/browser/host_content_settings_map.h"
#include "components/tab_groups/tab_group_color.h"
#include "components/tab_groups/tab_group_id.h"
#include "components/tabs/public/split_tab_data.h"
#include "components/tabs/public/split_tab_visual_data.h"
#include "components/tabs/public/tab_group.h"
#include "components/tabs/public/tab_group_tab_collection.h"
#include "components/tabs/public/tab_interface.h"
#include "components/web_modal/web_contents_modal_dialog_manager.h"
#include "components/web_modal/web_contents_modal_dialog_manager_delegate.h"
#include "content/public/browser/render_process_host.h"
#include "content/public/browser/render_view_host.h"
#include "content/public/browser/web_contents.h"
#include "content/public/test/browser_task_environment.h"
#include "content/public/test/navigation_simulator.h"
#include "content/public/test/test_renderer_host.h"
#include "content/public/test/web_contents_tester.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/skia/include/core/SkColor.h"
#include "ui/base/models/list_selection_model.h"

using content::WebContents;

namespace {

struct ObservedSelectionChange {
  ObservedSelectionChange() = default;
  ObservedSelectionChange(const ObservedSelectionChange& other) = default;
  ~ObservedSelectionChange() = default;

  ObservedSelectionChange& operator=(const ObservedSelectionChange& other) =
      default;

  explicit ObservedSelectionChange(
      const TabStripSelectionChange& selection_change) {
    old_tab = selection_change.old_tab ? selection_change.old_tab->GetHandle()
                                       : tabs::TabHandle::Null();
    new_tab = selection_change.new_tab ? selection_change.new_tab->GetHandle()
                                       : tabs::TabHandle::Null();

    old_model = selection_change.old_model;
    new_model = selection_change.new_model;
  }

  tabs::TabHandle old_tab = tabs::TabHandle::Null();
  tabs::TabHandle new_tab = tabs::TabHandle::Null();

  ui::ListSelectionModel old_model;
  ui::ListSelectionModel new_model;
};

class MockTabStripModelObserver : public TabStripModelObserver {
 public:
  MockTabStripModelObserver() = default;
  MockTabStripModelObserver(const MockTabStripModelObserver&) = delete;
  MockTabStripModelObserver& operator=(const MockTabStripModelObserver&) =
      delete;
  ~MockTabStripModelObserver() override = default;

  enum TabStripModelObserverAction {
    INSERT,
    CLOSE,
    DETACH,
    ACTIVATE,
    DEACTIVATE,
    SELECT,
    MOVE,
    CHANGE,
    PINNED,
    REPLACED,
    CLOSE_ALL,
    CLOSE_ALL_CANCELED,
    CLOSE_ALL_COMPLETED,
    GROUP_CHANGED,
  };

  struct State {
    State(WebContents* dst_contents,
          std::optional<size_t> dst_index,
          TabStripModelObserverAction action)
        : dst_contents(dst_contents), dst_index(dst_index), action(action) {}

    raw_ptr<WebContents, DanglingUntriaged> src_contents = nullptr;
    raw_ptr<WebContents, DanglingUntriaged> dst_contents;
    std::optional<size_t> src_index;
    std::optional<size_t> dst_index;
    int change_reason = CHANGE_REASON_NONE;
    bool foreground = false;
    TabStripModelObserverAction action;

    std::string ToString() const {
      std::ostringstream oss;
      const auto optional_to_string = [](const auto& opt) {
        return opt.has_value() ? base::NumberToString(opt.value())
                               : std::string("<none>");
      };
      oss << "State change: " << StringifyActionName(action)
          << "\n  Source index: " << optional_to_string(src_index)
          << "\n  Destination index: " << optional_to_string(dst_index)
          << "\n  Source contents: " << src_contents
          << "\n  Destination contents: " << dst_contents
          << "\n  Change reason: " << change_reason
          << "\n  Foreground: " << (foreground ? "yes" : "no");
      return oss.str();
    }

    bool operator==(const State& state) const {
      return src_contents == state.src_contents &&
             dst_contents == state.dst_contents &&
             src_index == state.src_index && dst_index == state.dst_index &&
             change_reason == state.change_reason &&
             foreground == state.foreground && action == state.action;
    }
  };

  int GetStateCount() const { return static_cast<int>(states_.size()); }

  // Returns (by way of parameters) the number of state's with CLOSE_ALL,
  // CLOSE_ALL_CANCELED and CLOSE_ALL_COMPLETED.
  void GetCloseCounts(int* close_all_count,
                      int* close_all_canceled_count,
                      int* close_all_completed_count) {
    *close_all_count = *close_all_canceled_count = *close_all_completed_count =
        0;
    for (int i = 0; i < GetStateCount(); ++i) {
      switch (GetStateAt(i).action) {
        case CLOSE_ALL:
          (*close_all_count)++;
          break;
        case CLOSE_ALL_CANCELED:
          (*close_all_canceled_count)++;
          break;
        case CLOSE_ALL_COMPLETED:
          (*close_all_completed_count)++;
          break;
        default:
          break;
      }
    }
  }

  const State& GetStateAt(int index) const {
    DCHECK(index >= 0 && index < GetStateCount());
    return states_[index];
  }

  void ExpectStateEquals(int index, const State& state) {
    EXPECT_TRUE(GetStateAt(index) == state)
        << "Got " << GetStateAt(index).ToString() << "\nExpected "
        << state.ToString();
  }

  void PushInsertState(WebContents* contents, int index, bool foreground) {
    State s(contents, index, INSERT);
    s.foreground = foreground;
    states_.push_back(s);
  }

  void PushActivateState(WebContents* old_contents,
                         WebContents* new_contents,
                         std::optional<size_t> index,
                         int reason) {
    State s(new_contents, index, ACTIVATE);
    s.src_contents = old_contents;
    s.change_reason = reason;
    states_.push_back(s);
  }

  void PushDeactivateState(WebContents* contents,
                           const ui::ListSelectionModel& old_model) {
    states_.emplace_back(contents, old_model.active(), DEACTIVATE);
  }

  void PushSelectState(content::WebContents* new_contents,
                       const ui::ListSelectionModel& old_model,
                       const ui::ListSelectionModel& new_model) {
    State s(new_contents, new_model.active(), SELECT);
    s.src_index = old_model.active();
    states_.push_back(s);
  }

  void PushMoveState(WebContents* contents, int from_index, int to_index) {
    const auto tab_index_to_selection_model_index =
        [](int tab_index) -> std::optional<size_t> {
      if (tab_index == TabStripModel::kNoTab) {
        return std::nullopt;
      }
      DCHECK_GE(tab_index, 0);
      return static_cast<size_t>(tab_index);
    };
    State s(contents, tab_index_to_selection_model_index(to_index), MOVE);
    s.src_index = tab_index_to_selection_model_index(from_index);
    states_.push_back(s);
  }

  void PushCloseState(WebContents* contents, int index) {
    states_.emplace_back(contents, index, CLOSE);
  }

  void PushDetachState(WebContents* contents, int index, bool was_active) {
    states_.emplace_back(contents, index, DETACH);
  }

  void PushReplaceState(WebContents* old_contents,
                        WebContents* new_contents,
                        int index) {
    State s(new_contents, index, REPLACED);
    s.src_contents = old_contents;
    states_.push_back(s);
  }

  struct TabGroupUpdate {
    int contents_update_count = 0;
    int visuals_update_count = 0;
  };

  const std::map<tab_groups::TabGroupId, TabGroupUpdate>& group_updates()
      const {
    return group_updates_;
  }

  const TabGroupUpdate group_update(tab_groups::TabGroupId group) {
    return group_updates_[group];
  }

  // TabStripModelObserver overrides:
  void OnTabStripModelChanged(
      TabStripModel* tab_strip_model,
      const TabStripModelChange& change,
      const TabStripSelectionChange& selection) override {
    latest_selection_change_ = ObservedSelectionChange(selection);
    switch (change.type()) {
      case TabStripModelChange::kInserted: {
        for (const auto& contents : change.GetInsert()->contents) {
          PushInsertState(contents.contents, contents.index,
                          selection.new_contents == contents.contents);
        }
        break;
      }
      case TabStripModelChange::kRemoved: {
        for (const auto& contents : change.GetRemove()->contents) {
          switch (contents.remove_reason) {
            case TabStripModelChange::RemoveReason::kDeleted:
              PushCloseState(contents.contents, contents.index);
              break;
            case TabStripModelChange::RemoveReason::kInsertedIntoOtherTabStrip:
              break;
          }
          PushDetachState(contents.contents, contents.index,
                          selection.old_contents == contents.contents);
        }
        break;
      }
      case TabStripModelChange::kReplaced: {
        auto* replace = change.GetReplace();
        PushReplaceState(replace->old_contents, replace->new_contents,
                         replace->index);
        break;
      }
      case TabStripModelChange::kMoved: {
        auto* move = change.GetMove();
        PushMoveState(move->contents, move->from_index, move->to_index);
        break;
      }
      case TabStripModelChange::kSelectionOnly:
        break;
    }

    if (selection.active_tab_changed()) {
      if (selection.old_contents && selection.selection_changed()) {
        PushDeactivateState(selection.old_contents, selection.old_model);
      }

      PushActivateState(selection.old_contents, selection.new_contents,
                        selection.new_model.active(), selection.reason);
    }

    if (selection.selection_changed()) {
      PushSelectState(selection.new_contents, selection.old_model,
                      selection.new_model);
    }
  }

  void TabGroupedStateChanged(TabStripModel* tab_strip_model,
                              std::optional<tab_groups::TabGroupId> old_group,
                              std::optional<tab_groups::TabGroupId> new_group,
                              tabs::TabInterface* tab,
                              int index) override {
    if (old_group.has_value()) {
      group_updates_[old_group.value()].contents_update_count++;
    }

    if (new_group.has_value()) {
      group_updates_[new_group.value()].contents_update_count++;
    }
  }

  void OnTabGroupChanged(const TabGroupChange& change) override {
    switch (change.type) {
      case TabGroupChange::kCreated: {
        group_updates_[change.group] = TabGroupUpdate();
        break;
      }
      case TabGroupChange::kEditorOpened: {
        break;
      }
      case TabGroupChange::kVisualsChanged: {
        group_updates_[change.group].visuals_update_count++;
        break;
      }
      case TabGroupChange::kMoved: {
        break;
      }
      case TabGroupChange::kClosed: {
        group_updates_.erase(change.group);
        break;
      }
    }
  }

  ObservedSelectionChange GetLatestSelectionChange() {
    return latest_selection_change_;
  }

  void TabChangedAt(WebContents* contents,
                    int index,
                    TabChangeType change_type) override {
    states_.emplace_back(contents, index, CHANGE);
  }

  void TabPinnedStateChanged(TabStripModel* tab_strip_model,
                             WebContents* contents,
                             int index) override {
    states_.emplace_back(contents, index, PINNED);
  }

  void WillCloseAllTabs(TabStripModel* tab_strip_model) override {
    states_.emplace_back(nullptr, std::nullopt, CLOSE_ALL);
  }

  void CloseAllTabsStopped(TabStripModel* tab_strip_model,
                           CloseAllStoppedReason reason) override {
    if (reason == kCloseAllCanceled) {
      states_.emplace_back(nullptr, std::nullopt, CLOSE_ALL_CANCELED);
    } else if (reason == kCloseAllCompleted) {
      states_.emplace_back(nullptr, std::nullopt, CLOSE_ALL_COMPLETED);
    }
  }

  void ClearStates() {
    states_.clear();
    group_updates_.clear();
  }

 private:
  static std::string_view StringifyActionName(
      TabStripModelObserverAction action) {
    using enum TabStripModelObserverAction;
    constexpr auto kObserverActionNames =
        base::MakeFixedFlatMap<TabStripModelObserverAction, std::string_view>({
            {INSERT, "INSERT"},
            {CLOSE, "CLOSE"},
            {DETACH, "DETACH"},
            {ACTIVATE, "ACTIVATE"},
            {DEACTIVATE, "DEACTIVATE"},
            {SELECT, "SELECT"},
            {MOVE, "MOVE"},
            {CHANGE, "CHANGE"},
            {PINNED, "PINNED"},
            {REPLACED, "REPLACED"},
            {CLOSE_ALL, "CLOSE_ALL"},
            {CLOSE_ALL_CANCELED, "CLOSE_ALL_CANCELED"},
            {CLOSE_ALL_COMPLETED, "CLOSE_ALL_COMPLETED"},
            {GROUP_CHANGED, "GROUP_CHANGED"},
        });
    const auto iter = kObserverActionNames.find(action);
    if (iter != kObserverActionNames.end()) {
      return iter->second;
    }

    NOTREACHED() << "bogus `TabStripModelObserverAction`: " << action;
  }

  std::vector<State> states_;
  ObservedSelectionChange latest_selection_change_;
  std::map<tab_groups::TabGroupId, TabGroupUpdate> group_updates_;
};

}  // namespace

class TabStripModelTest : public testing::Test {
 public:
  TabStripModelTest() : profile_(new TestingProfile) {}
  TabStripModelTest(const TabStripModelTest&) = delete;
  TabStripModelTest& operator=(const TabStripModelTest&) = delete;

  void SetUp() override {
    tabstrip_ = std::make_unique<TabStripModel>(delegate(), profile());
    scoped_feature_list_.InitWithFeatures(
        {features::kSideBySide, features::kSideBySideSessionRestore}, {});
    tabstrip()->AddObserver(observer());
    ASSERT_TRUE(tabstrip()->empty());
  }

  TabStripModel* tabstrip() { return tabstrip_.get(); }

  TestingProfile* profile() { return profile_.get(); }

  TestTabStripModelDelegate* delegate() { return &delegate_; }

  MockTabStripModelObserver* observer() { return &observer_; }

  base::test::ScopedFeatureList* scoped_feature_list() {
    return &scoped_feature_list_;
  }

  std::unique_ptr<WebContents> CreateWebContents() {
    return content::WebContentsTester::CreateTestWebContents(profile(),
                                                             nullptr);
  }

  std::unique_ptr<WebContents> CreateWebContentsWithSharedRPH(
      WebContents* web_contents) {
    WebContents::CreateParams create_params(
        profile(), web_contents->GetPrimaryMainFrame()->GetSiteInstance());
    std::unique_ptr<WebContents> retval = WebContents::Create(create_params);
    EXPECT_EQ(retval->GetPrimaryMainFrame()->GetProcess(),
              web_contents->GetPrimaryMainFrame()->GetProcess());
    return retval;
  }

  std::unique_ptr<WebContents> CreateWebContentsWithID(int id) {
    std::unique_ptr<WebContents> contents = CreateWebContents();
    SetID(contents.get(), id);
    return contents;
  }

  void PrepareTabs(TabStripModel* model, int tab_count) {
    for (int i = 0; i < tab_count; ++i) {
      model->AppendWebContents(CreateWebContentsWithID(i), true);
    }
  }

  void PrepareTabstripForSelectionTest(TabStripModel* model,
                                       int tab_count,
                                       int pinned_count,
                                       const std::vector<int> selected_tabs) {
    ::PrepareTabstripForSelectionTest(
        base::BindOnce(&TabStripModelTest::PrepareTabs, base::Unretained(this),
                       model),
        model, tab_count, pinned_count, selected_tabs);
  }

  void ExpectSelectionIsExactly(TabStripModel* tabstrip,
                                std::vector<int> selected) {
    for (const int i : selected) {
      EXPECT_TRUE(tabstrip_->selection_model().IsSelected(i));
    }
    EXPECT_EQ(tabstrip_->selection_model().size(), selected.size());
  }

  bool HasTabSwitchStartTimeAtIndex(int index) {
    return !content::WebContentsTester::For(tabstrip()->GetWebContentsAt(index))
                ->GetTabSwitchStartTime()
                .is_null();
  }

 private:
  content::BrowserTaskEnvironment task_environment_;
  content::RenderViewHostTestEnabler rvh_test_enabler_;
  const std::unique_ptr<TestingProfile> profile_;
  const tabs::TabModel::PreventFeatureInitializationForTesting prevent_;
  TestTabStripModelDelegate delegate_;
  MockTabStripModelObserver observer_;
  base::test::ScopedFeatureList scoped_feature_list_;
  std::unique_ptr<TabStripModel> tabstrip_ = nullptr;
};

TEST_F(TabStripModelTest, TestBasicAPI) {
  typedef MockTabStripModelObserver::State State;

  std::unique_ptr<WebContents> contents1 = CreateWebContentsWithID(1);
  WebContents* raw_contents1 = contents1.get();

  // Note! The ordering of these tests is important, each subsequent test
  // builds on the state established in the previous. This is important if you
  // ever insert tests rather than append.

  // Test AppendWebContents, ContainsIndex
  {
    EXPECT_FALSE(tabstrip()->ContainsIndex(0));
    tabstrip()->AppendWebContents(std::move(contents1), true);
    EXPECT_TRUE(tabstrip()->ContainsIndex(0));
    EXPECT_EQ(1, tabstrip()->count());
    EXPECT_EQ(3, observer()->GetStateCount());
    State s1(raw_contents1, 0, MockTabStripModelObserver::INSERT);
    s1.foreground = true;
    observer()->ExpectStateEquals(0, s1);
    State s2(raw_contents1, 0, MockTabStripModelObserver::ACTIVATE);
    observer()->ExpectStateEquals(1, s2);
    State s3(raw_contents1, 0, MockTabStripModelObserver::SELECT);
    s3.src_index = std::nullopt;
    observer()->ExpectStateEquals(2, s3);
    observer()->ClearStates();
  }
  EXPECT_EQ("1", GetTabStripStateString(tabstrip()));

  // Test InsertWebContentsAt, foreground tab.
  std::unique_ptr<WebContents> contents2 = CreateWebContentsWithID(2);
  content::WebContents* raw_contents2 = contents2.get();
  {
    tabstrip()->InsertWebContentsAt(1, std::move(contents2),
                                    AddTabTypes::ADD_ACTIVE);

    EXPECT_EQ(2, tabstrip()->count());
    EXPECT_EQ(4, observer()->GetStateCount());
    State s1(raw_contents2, 1, MockTabStripModelObserver::INSERT);
    s1.foreground = true;
    observer()->ExpectStateEquals(0, s1);
    State s2(raw_contents1, 0, MockTabStripModelObserver::DEACTIVATE);
    observer()->ExpectStateEquals(1, s2);
    State s3(raw_contents2, 1, MockTabStripModelObserver::ACTIVATE);
    s3.src_contents = raw_contents1;
    observer()->ExpectStateEquals(2, s3);
    State s4(raw_contents2, 1, MockTabStripModelObserver::SELECT);
    s4.src_index = 0;
    observer()->ExpectStateEquals(3, s4);
    observer()->ClearStates();
  }
  EXPECT_EQ("1 2", GetTabStripStateString(tabstrip()));

  // Test InsertWebContentsAt, background tab.
  std::unique_ptr<WebContents> contents3 = CreateWebContentsWithID(3);
  WebContents* raw_contents3 = contents3.get();
  {
    tabstrip()->InsertWebContentsAt(2, std::move(contents3),
                                    AddTabTypes::ADD_NONE);

    EXPECT_EQ(3, tabstrip()->count());
    EXPECT_EQ(1, observer()->GetStateCount());
    State s1(raw_contents3, 2, MockTabStripModelObserver::INSERT);
    s1.foreground = false;
    observer()->ExpectStateEquals(0, s1);
    observer()->ClearStates();
  }
  EXPECT_EQ("1 2 3", GetTabStripStateString(tabstrip()));

  // Test ActivateTabAt
  {
    tabstrip()->ActivateTabAt(
        2, TabStripUserGestureDetails(
               TabStripUserGestureDetails::GestureType::kOther));
    EXPECT_EQ(3, observer()->GetStateCount());
    State s1(raw_contents2, 1, MockTabStripModelObserver::DEACTIVATE);
    observer()->ExpectStateEquals(0, s1);
    State s2(raw_contents3, 2, MockTabStripModelObserver::ACTIVATE);
    s2.src_contents = raw_contents2;
    s2.change_reason = TabStripModelObserver::CHANGE_REASON_USER_GESTURE;
    observer()->ExpectStateEquals(1, s2);
    State s3(raw_contents3, 2, MockTabStripModelObserver::SELECT);
    s3.src_index = 1;
    observer()->ExpectStateEquals(2, s3);
    observer()->ClearStates();
  }
  EXPECT_EQ("1 2 3", GetTabStripStateString(tabstrip()));

  // Test DetachAndDeleteWebContentsAt
  {
    // add a background tab to detach
    std::unique_ptr<WebContents> contents4 = CreateWebContentsWithID(4);
    WebContents* raw_contents4 = contents4.get();
    tabstrip()->InsertWebContentsAt(3, std::move(contents4),
                                    AddTabTypes::ADD_NONE);
    // detach and delete the tab
    tabstrip()->DetachAndDeleteWebContentsAt(3);

    EXPECT_EQ(3, observer()->GetStateCount());
    State s1(raw_contents4, 3, MockTabStripModelObserver::INSERT);
    observer()->ExpectStateEquals(0, s1);
    State s2(raw_contents4, 3, MockTabStripModelObserver::CLOSE);
    observer()->ExpectStateEquals(1, s2);
    State s3(raw_contents4, 3, MockTabStripModelObserver::DETACH);
    observer()->ExpectStateEquals(2, s3);
    observer()->ClearStates();
  }
  EXPECT_EQ("1 2 3", GetTabStripStateString(tabstrip()));

  // Test CloseWebContentsAt
  {
    int previous_tab_count = tabstrip()->count();
    tabstrip()->CloseWebContentsAt(2, TabCloseTypes::CLOSE_NONE);
    EXPECT_EQ(previous_tab_count - 1, tabstrip()->count());

    EXPECT_EQ(5, observer()->GetStateCount());
    State s1(raw_contents3, 2, MockTabStripModelObserver::CLOSE);
    observer()->ExpectStateEquals(0, s1);
    State s2(raw_contents3, 2, MockTabStripModelObserver::DETACH);
    observer()->ExpectStateEquals(1, s2);
    State s3(raw_contents3, 2, MockTabStripModelObserver::DEACTIVATE);
    observer()->ExpectStateEquals(2, s3);
    State s4(raw_contents2, 1, MockTabStripModelObserver::ACTIVATE);
    s4.src_contents = raw_contents3;
    s4.change_reason = TabStripModelObserver::CHANGE_REASON_NONE;
    observer()->ExpectStateEquals(3, s4);
    State s5(raw_contents2, 1, MockTabStripModelObserver::SELECT);
    s5.src_index = 2;
    observer()->ExpectStateEquals(4, s5);
    observer()->ClearStates();
  }
  EXPECT_EQ("1 2", GetTabStripStateString(tabstrip()));

  // Test MoveWebContentsAt, select_after_move == true
  {
    tabstrip()->MoveWebContentsAt(1, 0, true);

    EXPECT_EQ(2, observer()->GetStateCount());
    State s1(raw_contents2, 0, MockTabStripModelObserver::MOVE);
    s1.src_index = 1;
    observer()->ExpectStateEquals(0, s1);
    EXPECT_EQ(0, tabstrip()->active_index());
    observer()->ClearStates();
  }
  EXPECT_EQ("2 1", GetTabStripStateString(tabstrip()));

  // Test MoveWebContentsAt, select_after_move == false
  {
    tabstrip()->MoveWebContentsAt(1, 0, false);
    EXPECT_EQ(2, observer()->GetStateCount());
    State s1(raw_contents1, 0, MockTabStripModelObserver::MOVE);
    s1.src_index = 1;
    observer()->ExpectStateEquals(0, s1);
    EXPECT_EQ(1, tabstrip()->active_index());

    tabstrip()->MoveWebContentsAt(0, 1, false);
    observer()->ClearStates();
  }
  EXPECT_EQ("2 1", GetTabStripStateString(tabstrip()));

  // Test Getters
  {
    EXPECT_EQ(raw_contents2, tabstrip()->GetActiveWebContents());
    EXPECT_EQ(raw_contents2, tabstrip()->GetWebContentsAt(0));
    EXPECT_EQ(raw_contents1, tabstrip()->GetWebContentsAt(1));
    EXPECT_EQ(0, tabstrip()->GetIndexOfWebContents(raw_contents2));
    EXPECT_EQ(1, tabstrip()->GetIndexOfWebContents(raw_contents1));
  }

  // Test UpdateWebContentsStateAt
  {
    tabstrip()->UpdateWebContentsStateAt(0, TabChangeType::kAll);
    EXPECT_EQ(1, observer()->GetStateCount());
    State s1(raw_contents2, 0, MockTabStripModelObserver::CHANGE);
    observer()->ExpectStateEquals(0, s1);
    observer()->ClearStates();
  }

  // Test SelectNextTab, SelectPreviousTab, SelectLastTab
  {
    // Make sure the second of the two tabs is selected first...
    tabstrip()->ActivateTabAt(
        1, TabStripUserGestureDetails(
               TabStripUserGestureDetails::GestureType::kOther));
    tabstrip()->SelectPreviousTab();
    EXPECT_EQ(0, tabstrip()->active_index());
    tabstrip()->SelectLastTab();
    EXPECT_EQ(1, tabstrip()->active_index());
    tabstrip()->SelectNextTab();
    EXPECT_EQ(0, tabstrip()->active_index());
  }

  // Test CloseSelectedTabs
  {
    tabstrip()->CloseSelectedTabs();
    // |CloseSelectedTabs| calls CloseWebContentsAt, we already tested that, now
    // just verify that the count and selected index have changed
    // appropriately...
    EXPECT_EQ(1, tabstrip()->count());
    EXPECT_EQ(0, tabstrip()->active_index());
  }

  observer()->ClearStates();
  tabstrip()->CloseAllTabs();

  int close_all_count = 0, close_all_canceled_count = 0,
      close_all_completed_count = 0;
  observer()->GetCloseCounts(&close_all_count, &close_all_canceled_count,
                             &close_all_completed_count);
  EXPECT_EQ(1, close_all_count);
  EXPECT_EQ(0, close_all_canceled_count);
  EXPECT_EQ(1, close_all_completed_count);

  // TabStripModel should now be empty.
  EXPECT_TRUE(tabstrip()->empty());

  // Opener methods are tested below...

  tabstrip()->RemoveObserver(observer());
}

TEST_F(TabStripModelTest, TestTabHandlesStaticTabstrip) {
  tabstrip()->AppendWebContents(CreateWebContentsWithID(1), true);
  const tabs::TabHandle handle1 = tabstrip()->GetTabAtIndex(0)->GetHandle();
  tabstrip()->AppendWebContents(CreateWebContentsWithID(2), true);
  const tabs::TabHandle handle2 = tabstrip()->GetTabAtIndex(1)->GetHandle();

  EXPECT_EQ(0, tabstrip()->GetIndexOfTab(handle1.Get()));
  EXPECT_EQ(handle1, tabstrip()->GetTabAtIndex(0)->GetHandle());
  EXPECT_EQ(1, tabstrip()->GetIndexOfTab(handle2.Get()));
  EXPECT_EQ(handle2, tabstrip()->GetTabAtIndex(1)->GetHandle());
}

TEST_F(TabStripModelTest, TestTabHandlesMovingTabInSameTabstrip) {
  tabstrip()->AppendWebContents(CreateWebContentsWithID(1), true);
  const tabs::TabHandle handle1 = tabstrip()->GetTabAtIndex(0)->GetHandle();
  tabstrip()->AppendWebContents(CreateWebContentsWithID(2), true);
  const tabs::TabHandle handle2 = tabstrip()->GetTabAtIndex(1)->GetHandle();

  tabstrip()->MoveWebContentsAt(0, 1, false);

  EXPECT_EQ(0, tabstrip()->GetIndexOfTab(handle2.Get()));
  EXPECT_EQ(handle2, tabstrip()->GetTabAtIndex(0)->GetHandle());
  EXPECT_EQ(1, tabstrip()->GetIndexOfTab(handle1.Get()));
  EXPECT_EQ(handle1, tabstrip()->GetTabAtIndex(1)->GetHandle());
}

TEST_F(TabStripModelTest, TestTabHandlesTabClosed) {
  tabstrip()->AppendWebContents(CreateWebContentsWithID(1), true);
  const tabs::TabHandle handle = tabstrip()->GetTabAtIndex(0)->GetHandle();
  tabstrip()->AppendWebContents(CreateWebContentsWithID(2), true);

  tabstrip()->CloseWebContentsAt(0, TabCloseTypes::CLOSE_NONE);

  EXPECT_EQ(TabStripModel::kNoTab, tabstrip()->GetIndexOfTab(handle.Get()));
  EXPECT_EQ(nullptr, handle.Get());
}

TEST_F(TabStripModelTest, TestTabHandlesOutOfBounds) {
  tabstrip()->AppendWebContents(CreateWebContentsWithID(1), true);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(2), true);

  EXPECT_EQ(TabStripModel::kNoTab, tabstrip()->GetIndexOfTab(nullptr));
  EXPECT_DEATH_IF_SUPPORTED(tabstrip()->GetTabAtIndex(2)->GetHandle(), "");
  EXPECT_DEATH_IF_SUPPORTED(tabstrip()->GetTabAtIndex(-1)->GetHandle(), "");
}

TEST_F(TabStripModelTest, TestTabHandlesAcrossModels) {
  MockBrowserWindowInterface bwi;
  delegate()->SetBrowserWindowInterface(&bwi);
  ON_CALL(bwi, GetTabStripModel()).WillByDefault(::testing::Return(tabstrip()));

  tabstrip()->AppendWebContents(CreateWebContentsWithID(1), true);
  const tabs::TabHandle handle = tabstrip()->GetTabAtIndex(0)->GetHandle();
  content::WebContents* raw_contents = handle.Get()->GetContents();
  tabstrip()->AppendWebContents(CreateWebContentsWithID(2), true);
  content::WebContents* const opener = tabstrip()->GetWebContentsAt(1);

  ASSERT_EQ(0, tabstrip()->GetIndexOfTab(handle.Get()));
  ASSERT_EQ(handle, tabstrip()->GetTabAtIndex(0)->GetHandle());
  ASSERT_EQ(tabstrip(),
            handle.Get()->GetBrowserWindowInterface()->GetTabStripModel());

  tabstrip()->SetOpenerOfWebContentsAt(0, opener);
  ASSERT_NE(nullptr, tabstrip()->GetOpenerOfTabAt(0));
  ASSERT_EQ(opener, tabstrip()->GetOpenerOfTabAt(0)->GetContents());
  tabstrip()->SetTabPinned(0, true);
  ASSERT_EQ(true, handle.Get()->IsPinned());
  tabstrip()->SetTabBlocked(0, true);
  ASSERT_EQ(true, tabstrip()->IsTabBlocked(0));

  // Detach the tab, and the TabModel should continue to exist, but its state
  // should get mostly reset.

  std::unique_ptr<tabs::TabModel> owned_tab =
      tabstrip()->DetachTabAtForInsertion(0);
  EXPECT_EQ(owned_tab.get(), handle.Get());
  // Tabs not in a tabstrip are not supported - this should CHECK.
  EXPECT_DEATH_IF_SUPPORTED(handle.Get()->GetBrowserWindowInterface(), "");

  EXPECT_EQ(raw_contents, handle.Get()->GetContents());
  EXPECT_EQ(nullptr, owned_tab.get()->opener());
  EXPECT_EQ(false, owned_tab.get()->reset_opener_on_active_tab_change());
  EXPECT_EQ(false, handle.Get()->IsPinned());
  EXPECT_EQ(false, owned_tab.get()->blocked());

  // Add it back into the tabstrip()->

  tabstrip()->InsertDetachedTabAt(0, std::move(owned_tab),
                                  AddTabTypes::ADD_NONE);
  EXPECT_EQ(tabstrip(),
            handle.Get()->GetBrowserWindowInterface()->GetTabStripModel());

  EXPECT_EQ(raw_contents, handle.Get()->GetContents());
  EXPECT_EQ(nullptr, tabstrip()->GetOpenerOfTabAt(0));
  EXPECT_EQ(false, handle.Get()->IsPinned());
  EXPECT_EQ(false, tabstrip()->IsTabBlocked(0));

  delegate()->SetBrowserWindowInterface(nullptr);
}

TEST_F(TabStripModelTest, TestDetachSplitInGroupNewSelection) {
  tabstrip()->AppendWebContents(CreateWebContentsWithID(1), false);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(2), false);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(3), true);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(4), true);

  EXPECT_EQ(tabstrip()->count(), 4);

  tabstrip()->AddToNewGroup(std::vector<int>{1, 2, 3});
  tabstrip()->ActivateTabAt(
      2, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));
  split_tabs::SplitTabId split_id = tabstrip()->AddToNewSplit(
      std::vector<int>{3}, split_tabs::SplitTabVisualData(),
      split_tabs::SplitTabCreatedSource::kToolbarButton);
  tabstrip()->ForgetAllOpeners();

  tabstrip()->DetachSplitTabForInsertion(split_id);
  EXPECT_EQ(tabstrip()->active_index(), 1);
}

TEST_F(TabStripModelTest, TestDetachTabInGroupNewSelection) {
  tabstrip()->AppendWebContents(CreateWebContentsWithID(1), false);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(2), false);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(3), true);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(4), true);

  EXPECT_EQ(tabstrip()->count(), 4);

  tabstrip()->AddToNewGroup(std::vector<int>{1, 2});
  tabstrip()->ActivateTabAt(
      2, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));
  tabstrip()->ForgetAllOpeners();

  tabstrip()->DetachTabAtForInsertion(2);
  EXPECT_EQ(tabstrip()->active_index(), 1);
}

TEST_F(TabStripModelTest, TestDetachTabInSplitNewSelection) {
  tabstrip()->AppendWebContents(CreateWebContentsWithID(1), false);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(2), false);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(3), true);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(4), true);
  EXPECT_EQ(tabstrip()->count(), 4);
  tabstrip()->AddToNewGroup(std::vector<int>{1, 2, 3});
  tabstrip()->ActivateTabAt(
      1, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));

  tabstrip()->AddToNewSplit({2}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);
  tabstrip()->ForgetAllOpeners();

  tabstrip()->DetachTabAtForInsertion(1);
  EXPECT_EQ(tabstrip()->active_index(), 1);
}

TEST_F(TabStripModelTest, TestDetachSplitForInsertion) {
  tabstrip()->AppendWebContents(CreateWebContentsWithID(1), false);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(2), false);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(3), true);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(4), false);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(5), false);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(6), true);

  tabstrip()->ActivateTabAt(
      2, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));

  split_tabs::SplitTabId split_id = tabstrip()->AddToNewSplit(
      {3}, split_tabs::SplitTabVisualData(),
      split_tabs::SplitTabCreatedSource::kToolbarButton);

  tabstrip()->ForgetAllOpeners();

  std::unique_ptr<DetachedTabCollection> detached_split =
      tabstrip()->DetachSplitTabForInsertion(split_id);

  tabs::SplitTabCollection* split_collection =
      std::get<std::unique_ptr<tabs::SplitTabCollection>>(
          detached_split->collection_)
          .get();

  EXPECT_EQ(split_collection->TabCountRecursive(), 2u);
  EXPECT_FALSE(tabstrip()->ContainsSplit(split_id));
  EXPECT_EQ(tabstrip()->count(), 4);
  EXPECT_EQ(tabstrip()->active_index(), 2);
  // Reinsert the detached group.
  tabstrip()->InsertDetachedSplitTabAt(std::move(detached_split), 0, false);

  EXPECT_TRUE(tabstrip()->ContainsSplit(split_id));
  EXPECT_EQ(tabstrip()->GetSplitData(split_id)->ListTabs().size(), 2u);
  EXPECT_EQ(tabstrip()->GetTabAtIndex(0)->GetSplit().value(), split_id);
  EXPECT_EQ(tabstrip()->GetTabAtIndex(1)->GetSplit().value(), split_id);
  EXPECT_EQ(tabstrip()->count(), 6);
}

TEST_F(TabStripModelTest, TestDetachGroupForInsertion) {
  tabstrip()->AppendWebContents(CreateWebContentsWithID(1), false);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(2), false);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(3), true);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(4), false);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(5), false);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(6), true);

  tab_groups::TabGroupId group_id =
      tabstrip()->AddToNewGroup(std::vector<int>{1, 2});
  std::unique_ptr<DetachedTabCollection> detached_group =
      tabstrip()->DetachTabGroupForInsertion(group_id);
  tabs::TabGroupTabCollection* group_collection =
      std::get<std::unique_ptr<tabs::TabGroupTabCollection>>(
          detached_group->collection_)
          .get();

  EXPECT_EQ(group_collection->TabCountRecursive(), 2u);
  EXPECT_FALSE(tabstrip()->group_model()->ContainsTabGroup(group_id));
  EXPECT_EQ(tabstrip()->count(), 4);

  // Reinsert the detached group.
  tabstrip()->InsertDetachedTabGroupAt(std::move(detached_group), 0);

  EXPECT_TRUE(tabstrip()->group_model()->ContainsTabGroup(group_id));
  EXPECT_EQ(
      tabstrip()->group_model()->GetTabGroup(group_id)->ListTabs().length(),
      2u);
  EXPECT_EQ(tabstrip()->GetTabAtIndex(0)->GetGroup().value(), group_id);
  EXPECT_EQ(tabstrip()->GetTabAtIndex(1)->GetGroup().value(), group_id);
  EXPECT_EQ(tabstrip()->count(), 6);
}

TEST_F(TabStripModelTest, TestInsertDetachGroupStartOfTabstrip) {
  PrepareTabstripForSelectionTest(tabstrip(), 5, 2, {2});

  tab_groups::TabGroupId group_id =
      tabstrip()->AddToNewGroup(std::vector<int>{3, 4});
  std::unique_ptr<DetachedTabCollection> detached_group =
      tabstrip()->DetachTabGroupForInsertion(group_id);
  tabs::TabGroupTabCollection* group_collection =
      std::get<std::unique_ptr<tabs::TabGroupTabCollection>>(
          detached_group->collection_)
          .get();

  EXPECT_EQ(group_collection->TabCountRecursive(), 2u);
  EXPECT_FALSE(tabstrip()->group_model()->ContainsTabGroup(group_id));
  EXPECT_EQ(tabstrip()->count(), 3);

  // Reinsert the detached group.
  gfx::Range insert_indices =
      tabstrip()->InsertDetachedTabGroupAt(std::move(detached_group), 0);

  EXPECT_TRUE(tabstrip()->group_model()->ContainsTabGroup(group_id));
  EXPECT_EQ(
      tabstrip()->group_model()->GetTabGroup(group_id)->ListTabs().length(),
      2u);
  EXPECT_EQ(tabstrip()->count(), 5);

  // group is inserted after the pinned container.
  EXPECT_EQ(insert_indices, gfx::Range(2, 4));
}

TEST_F(TabStripModelTest, TestDetachGroupNewSelection) {
  tabstrip()->AppendWebContents(CreateWebContentsWithID(1), false);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(2), false);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(3), true);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(4), false);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(5), false);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(6), true);

  tab_groups::TabGroupId group_id =
      tabstrip()->AddToNewGroup(std::vector<int>{1, 2});

  // Test the first preference is a tab the group opened.
  tabstrip()->ActivateTabAt(2);
  tabstrip()->ForgetAllOpeners();
  tabstrip()->SetOpenerOfWebContentsAt(0, tabstrip()->GetWebContentsAt(1));
  std::unique_ptr<DetachedTabCollection> detached_group =
      tabstrip()->DetachTabGroupForInsertion(group_id);

  EXPECT_EQ(tabstrip()->active_index(), 0);

  tabstrip()->InsertDetachedTabGroupAt(std::move(detached_group), 1);
  tabstrip()->ActivateTabAt(1);
  tabstrip()->ForgetAllOpeners();
  tabstrip()->SetOpenerOfWebContentsAt(4, tabstrip()->GetWebContentsAt(1));
  detached_group = tabstrip()->DetachTabGroupForInsertion(group_id);

  EXPECT_EQ(tabstrip()->active_index(), 2);

  // Test the second preference is a tab the group's opener opened.
  tabstrip()->InsertDetachedTabGroupAt(std::move(detached_group), 1);
  tabstrip()->ActivateTabAt(1);
  tabstrip()->ForgetAllOpeners();
  tabstrip()->SetOpenerOfWebContentsAt(2, tabstrip()->GetWebContentsAt(3));
  tabstrip()->SetOpenerOfWebContentsAt(1, tabstrip()->GetWebContentsAt(4));
  tabstrip()->SetOpenerOfWebContentsAt(0, tabstrip()->GetWebContentsAt(4));

  detached_group = tabstrip()->DetachTabGroupForInsertion(group_id);
  EXPECT_EQ(tabstrip()->active_index(), 0);

  // Test the third preference is the group's opener.
  tabstrip()->InsertDetachedTabGroupAt(std::move(detached_group), 1);
  tabstrip()->ActivateTabAt(1);
  tabstrip()->ForgetAllOpeners();
  tabstrip()->SetOpenerOfWebContentsAt(2, tabstrip()->GetWebContentsAt(3));

  detached_group = tabstrip()->DetachTabGroupForInsertion(group_id);
  EXPECT_EQ(tabstrip()->active_index(), 1);

  // Next preference is the tab after the last tab of the group.
  tabstrip()->InsertDetachedTabGroupAt(std::move(detached_group), 2);
  tabstrip()->ActivateTabAt(2);
  tabstrip()->ForgetAllOpeners();

  detached_group = tabstrip()->DetachTabGroupForInsertion(group_id);
  EXPECT_EQ(tabstrip()->active_index(), 2);

  // Last preference is the tab before the first tab of the group.
  tabstrip()->InsertDetachedTabGroupAt(std::move(detached_group),
                                       tabstrip()->count());
  tabstrip()->ActivateTabAt(5);
  tabstrip()->ForgetAllOpeners();

  detached_group = tabstrip()->DetachTabGroupForInsertion(group_id);
  EXPECT_EQ(tabstrip()->active_index(), 3);
}

TEST_F(TabStripModelTest, TestDetachAndInsertGroupWithSplit) {
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 5, 0, {2}));

  tab_groups::TabGroupId group_id =
      tabstrip()->AddToNewGroup(std::vector<int>{1, 2, 3});

  tabstrip()->ActivateTabAt(
      2, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));
  split_tabs::SplitTabId split_id = tabstrip()->AddToNewSplit(
      {3}, split_tabs::SplitTabVisualData(),
      split_tabs::SplitTabCreatedSource::kToolbarButton);

  std::unique_ptr<DetachedTabCollection> detached_group =
      tabstrip()->DetachTabGroupForInsertion(group_id);
  tabs::TabGroupTabCollection* group_collection =
      std::get<std::unique_ptr<tabs::TabGroupTabCollection>>(
          detached_group->collection_)
          .get();

  EXPECT_EQ(group_collection->TabCountRecursive(), 3u);
  EXPECT_FALSE(tabstrip()->group_model()->ContainsTabGroup(group_id));
  EXPECT_EQ(tabstrip()->count(), 2);

  // Reinsert the detached group.
  tabstrip()->InsertDetachedTabGroupAt(std::move(detached_group), 0);

  EXPECT_TRUE(tabstrip()->group_model()->ContainsTabGroup(group_id));
  EXPECT_EQ(
      tabstrip()->group_model()->GetTabGroup(group_id)->ListTabs().length(),
      3u);
  EXPECT_EQ(tabstrip()->group_model()->GetTabGroup(group_id)->ListTabs(),
            gfx::Range(0, 3));
  std::vector<tabs::TabInterface*> expected_split_tabs = {
      tabstrip()->GetTabAtIndex(1), tabstrip()->GetTabAtIndex(2)};
  EXPECT_EQ(tabstrip()->GetSplitData(split_id)->ListTabs(),
            expected_split_tabs);
  EXPECT_EQ(tabstrip()->count(), 5);
  EXPECT_EQ("1 2s 3s 0 4", GetTabStripStateString(tabstrip()));
}

TEST_F(TabStripModelTest, InsertDetachedGroupSelectionObserver) {
  tabstrip()->AppendWebContents(CreateWebContentsWithID(1), false);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(2), true);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(3), false);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(4), false);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(5), false);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(6), false);

  tab_groups::TabGroupId group_id =
      tabstrip()->AddToNewGroup(std::vector<int>{1, 2});
  tabstrip()->ActivateTabAt(1);
  std::unique_ptr<DetachedTabCollection> detached_group =
      tabstrip()->DetachTabGroupForInsertion(group_id);

  tabs::TabInterface* active_tab = tabstrip()->GetActiveTab();
  observer()->ClearStates();

  tabstrip()->InsertDetachedTabGroupAt(std::move(detached_group),
                                       tabstrip()->count());
  ObservedSelectionChange change = observer()->GetLatestSelectionChange();

  EXPECT_EQ(active_tab->GetHandle(), change.old_tab);
  EXPECT_EQ(tabstrip()->GetActiveTab()->GetHandle(), change.new_tab);
  EXPECT_EQ(tabstrip()->active_index(), 4);

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, TestBasicOpenerAPI) {
  // This is a basic test of opener functionality. opener is created
  // as the first tab in the strip and then we create 5 other tabs in the
  // background with opener set as their opener.

  std::unique_ptr<WebContents> opener = CreateWebContents();
  WebContents* raw_opener = opener.get();
  tabstrip()->AppendWebContents(std::move(opener), true);
  std::unique_ptr<WebContents> contents1 = CreateWebContents();
  WebContents* raw_contents1 = contents1.get();
  std::unique_ptr<WebContents> contents2 = CreateWebContents();
  std::unique_ptr<WebContents> contents3 = CreateWebContents();
  std::unique_ptr<WebContents> contents4 = CreateWebContents();
  std::unique_ptr<WebContents> contents5 = CreateWebContents();
  WebContents* raw_contents5 = contents5.get();

  // We use |InsertWebContentsAt| here instead of |AppendWebContents| so that
  // openership relationships are preserved.
  tabstrip()->InsertWebContentsAt(tabstrip()->count(), std::move(contents1),
                                  AddTabTypes::ADD_INHERIT_OPENER);
  tabstrip()->InsertWebContentsAt(tabstrip()->count(), std::move(contents2),
                                  AddTabTypes::ADD_INHERIT_OPENER);
  tabstrip()->InsertWebContentsAt(tabstrip()->count(), std::move(contents3),
                                  AddTabTypes::ADD_INHERIT_OPENER);
  tabstrip()->InsertWebContentsAt(tabstrip()->count(), std::move(contents4),
                                  AddTabTypes::ADD_INHERIT_OPENER);
  tabstrip()->InsertWebContentsAt(tabstrip()->count(), std::move(contents5),
                                  AddTabTypes::ADD_INHERIT_OPENER);

  // All the tabs should have the same opener.
  for (int i = 1; i < tabstrip()->count(); ++i) {
    const tabs::TabInterface* tab_opener = tabstrip()->GetOpenerOfTabAt(i);
    EXPECT_EQ(raw_opener, tab_opener ? tab_opener->GetContents() : nullptr);
  }

  // If there is a next adjacent item, then the index should be of that item.
  EXPECT_EQ(2, tabstrip()->GetIndexOfNextWebContentsOpenedByOpenerOf(
                   gfx::Range(1, 2)));
  // If the last tab in the opener tree is closed, the preceding tab in the same
  // tree should be selected.
  EXPECT_EQ(4, tabstrip()->GetIndexOfNextWebContentsOpenedByOpenerOf(
                   gfx::Range(5, 6)));

  // Tests the method that finds the last tab opened by the same opener in the
  // strip (this is the insertion index for the next background tab for the
  // specified opener).
  EXPECT_EQ(5, tabstrip()->GetIndexOfLastWebContentsOpenedBy(raw_opener, 1));

  // For a tab that has opened no other tabs, the return value should always be
  // -1...
  EXPECT_EQ(-1,
            tabstrip()->GetIndexOfNextWebContentsOpenedBy(gfx::Range(1, 2)));
  EXPECT_EQ(-1,
            tabstrip()->GetIndexOfLastWebContentsOpenedBy(raw_contents1, 3));

  // ForgetAllOpeners should destroy all opener relationships.
  tabstrip()->ForgetAllOpeners();
  EXPECT_EQ(-1,
            tabstrip()->GetIndexOfNextWebContentsOpenedBy(gfx::Range(1, 2)));
  EXPECT_EQ(-1,
            tabstrip()->GetIndexOfNextWebContentsOpenedBy(gfx::Range(5, 6)));
  EXPECT_EQ(-1, tabstrip()->GetIndexOfLastWebContentsOpenedBy(raw_opener, 1));

  // Specify the last tab as the opener of the others.
  for (int i = 0; i < tabstrip()->count() - 1; ++i) {
    tabstrip()->SetOpenerOfWebContentsAt(i, raw_contents5);
  }

  for (int i = 0; i < tabstrip()->count() - 1; ++i) {
    const tabs::TabInterface* tab_opener = tabstrip()->GetOpenerOfTabAt(i);
    EXPECT_EQ(raw_contents5, tab_opener ? tab_opener->GetContents() : nullptr);
  }

  // If there is a next adjacent item, then the index should be of that item.
  EXPECT_EQ(2, tabstrip()->GetIndexOfNextWebContentsOpenedByOpenerOf(
                   gfx::Range(1, 2)));

  // If the last tab in the opener tree is closed, the preceding tab in the same
  // opener tree should be selected.
  EXPECT_EQ(3, tabstrip()->GetIndexOfNextWebContentsOpenedByOpenerOf(
                   gfx::Range(4, 5)));

  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());
}

static int GetInsertionIndex(TabStripModel* tabstrip) {
  return tabstrip->DetermineInsertionIndex(ui::PAGE_TRANSITION_LINK, false);
}

static void InsertWebContentses(TabStripModel* tabstrip,
                                std::unique_ptr<WebContents> contents1,
                                std::unique_ptr<WebContents> contents2,
                                std::unique_ptr<WebContents> contents3) {
  tabstrip->InsertWebContentsAt(GetInsertionIndex(tabstrip),
                                std::move(contents1),
                                AddTabTypes::ADD_INHERIT_OPENER);
  tabstrip->InsertWebContentsAt(GetInsertionIndex(tabstrip),
                                std::move(contents2),
                                AddTabTypes::ADD_INHERIT_OPENER);
  tabstrip->InsertWebContentsAt(GetInsertionIndex(tabstrip),
                                std::move(contents3),
                                AddTabTypes::ADD_INHERIT_OPENER);
}

static bool IsSiteInContentSettingExceptionList(
    HostContentSettingsMap* settings,
    GURL& url,
    ContentSettingsType type) {
  content_settings::SettingInfo info;
  settings->GetWebsiteSetting(url, url, type, &info);
  auto pattern = ContentSettingsPattern::FromURLNoWildcard(url);
  return info.primary_pattern.Compare(pattern) ==
         ContentSettingsPattern::IDENTITY;
}

// Tests opening background tabs.
TEST_F(TabStripModelTest, TestLTRInsertionOptions) {
  std::unique_ptr<WebContents> opener = CreateWebContents();
  tabstrip()->AppendWebContents(std::move(opener), true);

  std::unique_ptr<WebContents> contents1 = CreateWebContents();
  WebContents* raw_contents1 = contents1.get();
  std::unique_ptr<WebContents> contents2 = CreateWebContents();
  WebContents* raw_contents2 = contents2.get();
  std::unique_ptr<WebContents> contents3 = CreateWebContents();
  WebContents* raw_contents3 = contents3.get();

  // Test LTR
  InsertWebContentses(tabstrip(), std::move(contents1), std::move(contents2),
                      std::move(contents3));
  EXPECT_EQ(raw_contents1, tabstrip()->GetWebContentsAt(1));
  EXPECT_EQ(raw_contents2, tabstrip()->GetWebContentsAt(2));
  EXPECT_EQ(raw_contents3, tabstrip()->GetWebContentsAt(3));

  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());
}

// This test constructs a tabstrip, and then simulates loading several tabs in
// the background from link clicks on the first tab. Then it simulates opening
// a new tab from the first tab in the foreground via a link click, verifies
// that this tab is opened adjacent to the opener, then closes it.
// Finally it tests that a tab opened for some non-link purpose opens at the
// end of the strip, not bundled to any existing context.
TEST_F(TabStripModelTest, TestInsertionIndexDetermination) {
  std::unique_ptr<WebContents> opener = CreateWebContents();
  WebContents* raw_opener = opener.get();
  tabstrip()->AppendWebContents(std::move(opener), true);

  // Open some other random unrelated tab in the background to monkey with our
  // insertion index.
  std::unique_ptr<WebContents> other = CreateWebContents();
  WebContents* raw_other = other.get();
  tabstrip()->AppendWebContents(std::move(other), false);

  std::unique_ptr<WebContents> contents1 = CreateWebContents();
  WebContents* raw_contents1 = contents1.get();
  std::unique_ptr<WebContents> contents2 = CreateWebContents();
  WebContents* raw_contents2 = contents2.get();
  std::unique_ptr<WebContents> contents3 = CreateWebContents();
  WebContents* raw_contents3 = contents3.get();

  // Start by testing LTR.
  InsertWebContentses(tabstrip(), std::move(contents1), std::move(contents2),
                      std::move(contents3));
  EXPECT_EQ(raw_opener, tabstrip()->GetWebContentsAt(0));
  EXPECT_EQ(raw_contents1, tabstrip()->GetWebContentsAt(1));
  EXPECT_EQ(raw_contents2, tabstrip()->GetWebContentsAt(2));
  EXPECT_EQ(raw_contents3, tabstrip()->GetWebContentsAt(3));
  EXPECT_EQ(raw_other, tabstrip()->GetWebContentsAt(4));

  // The opener API should work...
  EXPECT_EQ(3, tabstrip()->GetIndexOfNextWebContentsOpenedByOpenerOf(
                   gfx::Range(2, 3)));
  EXPECT_EQ(2, tabstrip()->GetIndexOfNextWebContentsOpenedByOpenerOf(
                   gfx::Range(3, 4)));
  EXPECT_EQ(3, tabstrip()->GetIndexOfLastWebContentsOpenedBy(raw_opener, 1));

  // Now open a foreground tab from a link. It should be opened adjacent to the
  // opener tab.
  std::unique_ptr<WebContents> fg_link_contents = CreateWebContents();
  WebContents* raw_fg_link_contents = fg_link_contents.get();
  int insert_index =
      tabstrip()->DetermineInsertionIndex(ui::PAGE_TRANSITION_LINK, true);
  EXPECT_EQ(1, insert_index);
  tabstrip()->InsertWebContentsAt(
      insert_index, std::move(fg_link_contents),
      AddTabTypes::ADD_ACTIVE | AddTabTypes::ADD_INHERIT_OPENER);
  EXPECT_EQ(1, tabstrip()->active_index());
  EXPECT_EQ(raw_fg_link_contents, tabstrip()->GetActiveWebContents());

  // Now close this contents. The selection should move to the opener contents.
  tabstrip()->CloseSelectedTabs();
  EXPECT_EQ(0, tabstrip()->active_index());

  // Now open a new empty tab. It should open at the end of the tabstrip()->
  std::unique_ptr<WebContents> fg_nonlink_contents = CreateWebContents();
  WebContents* raw_fg_nonlink_contents = fg_nonlink_contents.get();
  insert_index = tabstrip()->DetermineInsertionIndex(
      ui::PAGE_TRANSITION_AUTO_BOOKMARK, true);
  EXPECT_EQ(tabstrip()->count(), insert_index);
  // We break the opener relationship...
  tabstrip()->InsertWebContentsAt(insert_index, std::move(fg_nonlink_contents),
                                  AddTabTypes::ADD_NONE);
  // Now select it, so that GestureType != kNone causes the opener
  // relationship to be forgotten...
  tabstrip()->ActivateTabAt(
      tabstrip()->count() - 1,
      TabStripUserGestureDetails(
          TabStripUserGestureDetails::GestureType::kOther));
  EXPECT_EQ(tabstrip()->count() - 1, tabstrip()->active_index());
  EXPECT_EQ(raw_fg_nonlink_contents, tabstrip()->GetActiveWebContents());

  // Verify that all opener relationships are forgotten.
  EXPECT_EQ(-1,
            tabstrip()->GetIndexOfNextWebContentsOpenedBy(gfx::Range(2, 3)));
  EXPECT_EQ(-1,
            tabstrip()->GetIndexOfNextWebContentsOpenedBy(gfx::Range(3, 4)));
  EXPECT_EQ(-1, tabstrip()->GetIndexOfLastWebContentsOpenedBy(raw_opener, 1));

  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());
}

// Tests that non-adjacent tabs with an opener are ignored when deciding where
// to position tabs.
TEST_F(TabStripModelTest, TestInsertionIndexDeterminationAfterDragged) {
  // Start with three tabs, of which the first is active.
  std::unique_ptr<WebContents> opener1 = CreateWebContentsWithID(1);
  WebContents* raw_opener1 = opener1.get();
  tabstrip()->AppendWebContents(std::move(opener1), true /* foreground */);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(2), false);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(3), false);
  EXPECT_EQ("1 2 3", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(1, GetID(tabstrip()->GetActiveWebContents()));
  EXPECT_EQ(-1, tabstrip()->GetIndexOfLastWebContentsOpenedBy(raw_opener1, 0));

  // Open a link in a new background tab.
  tabstrip()->InsertWebContentsAt(GetInsertionIndex(tabstrip()),
                                  CreateWebContentsWithID(11),
                                  AddTabTypes::ADD_INHERIT_OPENER);
  EXPECT_EQ("1 11 2 3", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(1, GetID(tabstrip()->GetActiveWebContents()));
  EXPECT_EQ(1, tabstrip()->GetIndexOfLastWebContentsOpenedBy(raw_opener1, 0));

  // Drag that tab (which activates it) one to the right.
  tabstrip()->MoveWebContentsAt(1, 2, true /* select_after_move */);
  EXPECT_EQ("1 2 11 3", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(11, GetID(tabstrip()->GetActiveWebContents()));
  // It should no longer be counted by GetIndexOfLastWebContentsOpenedBy,
  // since there is a tab in between, even though its opener is unchanged.
  // TODO(johnme): Maybe its opener should be reset when it's dragged away.
  EXPECT_EQ(-1, tabstrip()->GetIndexOfLastWebContentsOpenedBy(raw_opener1, 0));

  tabs::TabInterface* tab_opener = tabstrip()->GetOpenerOfTabAt(2);
  EXPECT_EQ(raw_opener1, tab_opener ? tab_opener->GetContents() : nullptr);

  // Activate the parent tab again.
  tabstrip()->ActivateTabAt(
      0, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));
  EXPECT_EQ(1, GetID(tabstrip()->GetActiveWebContents()));

  // Open another link in a new background tab.
  tabstrip()->InsertWebContentsAt(GetInsertionIndex(tabstrip()),
                                  CreateWebContentsWithID(12),
                                  AddTabTypes::ADD_INHERIT_OPENER);
  // Tab 12 should be next to 1, and considered opened by it.
  EXPECT_EQ("1 12 2 11 3", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(1, GetID(tabstrip()->GetActiveWebContents()));
  EXPECT_EQ(1, tabstrip()->GetIndexOfLastWebContentsOpenedBy(raw_opener1, 0));

  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());
}

// Tests that grandchild tabs are considered to be opened by their grandparent
// tab when deciding where to position tabs.
TEST_F(TabStripModelTest, TestInsertionIndexDeterminationNestedOpener) {
  // Start with two tabs, of which the first is active:
  std::unique_ptr<WebContents> opener1 = CreateWebContentsWithID(1);
  WebContents* raw_opener1 = opener1.get();
  tabstrip()->AppendWebContents(std::move(opener1), true /* foreground */);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(2), false);
  EXPECT_EQ("1 2", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(1, GetID(tabstrip()->GetActiveWebContents()));
  EXPECT_EQ(-1, tabstrip()->GetIndexOfLastWebContentsOpenedBy(raw_opener1, 0));

  // Open a link in a new background child tab.
  std::unique_ptr<WebContents> child11 = CreateWebContentsWithID(11);
  WebContents* raw_child11 = child11.get();
  tabstrip()->InsertWebContentsAt(GetInsertionIndex(tabstrip()),
                                  std::move(child11),
                                  AddTabTypes::ADD_INHERIT_OPENER);
  EXPECT_EQ("1 11 2", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(1, GetID(tabstrip()->GetActiveWebContents()));
  EXPECT_EQ(1, tabstrip()->GetIndexOfLastWebContentsOpenedBy(raw_opener1, 0));

  // Activate the child tab:
  tabstrip()->ActivateTabAt(
      1, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));
  EXPECT_EQ(11, GetID(tabstrip()->GetActiveWebContents()));

  // Open a link in a new background grandchild tab.
  tabstrip()->InsertWebContentsAt(GetInsertionIndex(tabstrip()),
                                  CreateWebContentsWithID(111),
                                  AddTabTypes::ADD_INHERIT_OPENER);
  EXPECT_EQ("1 11 111 2", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(11, GetID(tabstrip()->GetActiveWebContents()));
  // The grandchild tab should be counted by GetIndexOfLastWebContentsOpenedBy
  // as opened by both its parent (child11) and grandparent (opener1).
  EXPECT_EQ(2, tabstrip()->GetIndexOfLastWebContentsOpenedBy(raw_opener1, 0));
  EXPECT_EQ(2, tabstrip()->GetIndexOfLastWebContentsOpenedBy(raw_child11, 1));

  // Activate the parent tab again:
  tabstrip()->ActivateTabAt(
      0, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));
  EXPECT_EQ(1, GetID(tabstrip()->GetActiveWebContents()));

  // Open another link in a new background child tab (a sibling of child11).
  tabstrip()->InsertWebContentsAt(GetInsertionIndex(tabstrip()),
                                  CreateWebContentsWithID(12),
                                  AddTabTypes::ADD_INHERIT_OPENER);
  EXPECT_EQ("1 11 111 12 2", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(1, GetID(tabstrip()->GetActiveWebContents()));
  // opener1 has three adjacent descendants (11, 111, 12)
  EXPECT_EQ(3, tabstrip()->GetIndexOfLastWebContentsOpenedBy(raw_opener1, 0));
  // child11 has only one adjacent descendant (111)
  EXPECT_EQ(2, tabstrip()->GetIndexOfLastWebContentsOpenedBy(raw_child11, 1));

  // Closing a tab should cause its children to inherit the tab's opener.
  int previous_tab_count = tabstrip()->count();
  tabstrip()->CloseWebContentsAt(
      1, TabCloseTypes::CLOSE_USER_GESTURE |
             TabCloseTypes::CLOSE_CREATE_HISTORICAL_TAB);
  EXPECT_EQ(previous_tab_count - 1, tabstrip()->count());
  EXPECT_EQ("1 111 12 2", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(1, GetID(tabstrip()->GetActiveWebContents()));
  // opener1 is now the opener of 111, so has two adjacent descendants (111, 12)
  tabs::TabInterface* tab_opener = tabstrip()->GetOpenerOfTabAt(1);
  EXPECT_EQ(raw_opener1, tab_opener ? tab_opener->GetContents() : nullptr);
  EXPECT_EQ(2, tabstrip()->GetIndexOfLastWebContentsOpenedBy(raw_opener1, 0));

  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());
}

// Tests that selection is shifted to the correct tab when a tab is closed.
// If the tab is in the background when it is closed, the selection does not
// change.
TEST_F(TabStripModelTest, CloseInactiveTabKeepsSelection) {
  std::unique_ptr<WebContents> opener = CreateWebContents();
  tabstrip()->AppendWebContents(std::move(opener), true);
  InsertWebContentses(tabstrip(), CreateWebContents(), CreateWebContents(),
                      CreateWebContents());
  ASSERT_EQ(0, tabstrip()->active_index());

  tabstrip()->CloseWebContentsAt(1, TabCloseTypes::CLOSE_NONE);
  EXPECT_EQ(0, tabstrip()->active_index());
  tabstrip()->CloseWebContentsAt(1, TabCloseTypes::CLOSE_NONE);
  EXPECT_EQ(0, tabstrip()->active_index());
  tabstrip()->CloseWebContentsAt(1, TabCloseTypes::CLOSE_NONE);
  EXPECT_EQ(0, tabstrip()->active_index());

  tabstrip()->CloseAllTabs();
  ASSERT_TRUE(tabstrip()->empty());
}

// Tests that selection is shifted to the correct tab when a tab is closed.
// If the tab doesn't have an opener or a group, selection shifts to the right.
TEST_F(TabStripModelTest, CloseActiveTabShiftsSelectionRight) {
  std::unique_ptr<WebContents> opener = CreateWebContents();
  tabstrip()->AppendWebContents(std::move(opener), true);
  InsertWebContentses(tabstrip(), CreateWebContents(), CreateWebContents(),
                      CreateWebContents());
  ASSERT_EQ(0, tabstrip()->active_index());

  tabstrip()->ForgetAllOpeners();
  tabstrip()->ActivateTabAt(
      1, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));
  ASSERT_EQ(1, tabstrip()->active_index());

  tabstrip()->CloseWebContentsAt(1, TabCloseTypes::CLOSE_NONE);
  EXPECT_EQ(1, tabstrip()->active_index());
  tabstrip()->CloseWebContentsAt(1, TabCloseTypes::CLOSE_NONE);
  EXPECT_EQ(1, tabstrip()->active_index());
  tabstrip()->CloseWebContentsAt(1, TabCloseTypes::CLOSE_NONE);
  EXPECT_EQ(0, tabstrip()->active_index());

  tabstrip()->CloseAllTabs();
  ASSERT_TRUE(tabstrip()->empty());
}

// Tests that selection is shifted to the correct tab when a tab is closed.
// If the tab doesn't have an opener but is in a group, selection shifts to
// another tab in the same group.
TEST_F(TabStripModelTest, CloseGroupedTabShiftsSelectionWithinGroup) {
  ASSERT_TRUE(tabstrip()->SupportsTabGroups());

  std::unique_ptr<WebContents> opener = CreateWebContents();
  tabstrip()->AppendWebContents(std::move(opener), true);
  InsertWebContentses(tabstrip(), CreateWebContents(), CreateWebContents(),
                      CreateWebContents());
  ASSERT_EQ(0, tabstrip()->active_index());

  tabstrip()->ForgetAllOpeners();
  tabstrip()->AddToNewGroup({0, 1, 2});
  tabstrip()->ActivateTabAt(
      1, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));
  ASSERT_EQ(1, tabstrip()->active_index());

  tabstrip()->CloseWebContentsAt(1, TabCloseTypes::CLOSE_NONE);
  EXPECT_EQ(1, tabstrip()->active_index());
  tabstrip()->CloseWebContentsAt(1, TabCloseTypes::CLOSE_NONE);
  EXPECT_EQ(0, tabstrip()->active_index());
  tabstrip()->CloseWebContentsAt(1, TabCloseTypes::CLOSE_NONE);
  EXPECT_EQ(0, tabstrip()->active_index());

  tabstrip()->CloseAllTabs();
  ASSERT_TRUE(tabstrip()->empty());
}

// Tests that the active selection will change to another non collapsed tab when
// the active index is in the collapsing group.
TEST_F(TabStripModelTest, CollapseGroupShiftsSelection_SuccessNextTab) {
  ASSERT_TRUE(tabstrip()->SupportsTabGroups());

  std::unique_ptr<WebContents> opener = CreateWebContents();
  tabstrip()->AppendWebContents(std::move(opener), true);
  InsertWebContentses(tabstrip(), CreateWebContents(), CreateWebContents(),
                      CreateWebContents());
  ASSERT_EQ(0, tabstrip()->active_index());

  tabstrip()->ForgetAllOpeners();
  tab_groups::TabGroupId group = tabstrip()->AddToNewGroup({0, 1});
  tabstrip()->ActivateTabAt(
      1, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));
  ASSERT_EQ(1, tabstrip()->active_index());

  std::optional<int> next_active = tabstrip()->GetNextExpandedActiveTab(group);

  EXPECT_EQ(2, next_active);

  tabstrip()->CloseAllTabs();
  ASSERT_TRUE(tabstrip()->empty());
}

// Tests that the active selection will change to another non collapsed tab when
// the active index is in the collapsing group.
TEST_F(TabStripModelTest, CollapseGroupShiftsSelection_SuccessPreviousTab) {
  ASSERT_TRUE(tabstrip()->SupportsTabGroups());

  std::unique_ptr<WebContents> opener = CreateWebContents();
  tabstrip()->AppendWebContents(std::move(opener), true);
  InsertWebContentses(tabstrip(), CreateWebContents(), CreateWebContents(),
                      CreateWebContents());
  ASSERT_EQ(0, tabstrip()->active_index());

  tabstrip()->ForgetAllOpeners();
  tab_groups::TabGroupId group = tabstrip()->AddToNewGroup({2, 3});
  tabstrip()->ActivateTabAt(
      2, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));
  ASSERT_EQ(2, tabstrip()->active_index());

  std::optional<int> next_active = tabstrip()->GetNextExpandedActiveTab(group);

  EXPECT_EQ(1, next_active);

  tabstrip()->CloseAllTabs();
  ASSERT_TRUE(tabstrip()->empty());
}

// Tests that there is no valid selection to shift to when the active tab is in
// the group that will be collapsed.
TEST_F(TabStripModelTest, CollapseGroupShiftsSelection_NoAvailableTabs) {
  ASSERT_TRUE(tabstrip()->SupportsTabGroups());

  std::unique_ptr<WebContents> opener = CreateWebContents();
  tabstrip()->AppendWebContents(std::move(opener), true);
  InsertWebContentses(tabstrip(), CreateWebContents(), CreateWebContents(),
                      CreateWebContents());
  ASSERT_EQ(0, tabstrip()->active_index());

  tabstrip()->ForgetAllOpeners();
  tab_groups::TabGroupId group = tabstrip()->AddToNewGroup({0, 1, 2, 3});
  tabstrip()->ActivateTabAt(
      1, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));
  ASSERT_EQ(1, tabstrip()->active_index());

  std::optional<int> next_active = tabstrip()->GetNextExpandedActiveTab(group);

  EXPECT_EQ(std::nullopt, next_active);

  tabstrip()->CloseAllTabs();
  ASSERT_TRUE(tabstrip()->empty());
}

// Tests that selection is shifted to the correct tab when a tab is closed.
// If the tab does have an opener, selection shifts to the next tab opened by
// the same opener scanning LTR.
TEST_F(TabStripModelTest, CloseTabWithOpenerShiftsSelectionWithinOpened) {
  std::unique_ptr<WebContents> opener = CreateWebContents();
  tabstrip()->AppendWebContents(std::move(opener), true);
  InsertWebContentses(tabstrip(), CreateWebContents(), CreateWebContents(),
                      CreateWebContents());
  ASSERT_EQ(0, tabstrip()->active_index());

  tabstrip()->ActivateTabAt(
      2, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));
  ASSERT_EQ(2, tabstrip()->active_index());

  tabstrip()->CloseWebContentsAt(2, TabCloseTypes::CLOSE_NONE);
  EXPECT_EQ(2, tabstrip()->active_index());
  tabstrip()->CloseWebContentsAt(2, TabCloseTypes::CLOSE_NONE);
  EXPECT_EQ(1, tabstrip()->active_index());
  tabstrip()->CloseWebContentsAt(1, TabCloseTypes::CLOSE_NONE);
  EXPECT_EQ(0, tabstrip()->active_index());

  tabstrip()->CloseAllTabs();
  ASSERT_TRUE(tabstrip()->empty());
}

// Tests that selection is shifted to the correct tab when a tab is closed.
// If the tab has an opener but no "siblings" opened by the same opener,
// selection shifts to the opener itself.
TEST_F(TabStripModelTest, CloseTabWithOpenerShiftsSelectionToOpener) {
  std::unique_ptr<WebContents> opener = CreateWebContents();
  tabstrip()->AppendWebContents(std::move(opener), true);
  std::unique_ptr<WebContents> other_contents = CreateWebContents();
  tabstrip()->InsertWebContentsAt(1, std::move(other_contents),
                                  AddTabTypes::ADD_NONE);
  ASSERT_EQ(2, tabstrip()->count());
  std::unique_ptr<WebContents> opened_contents = CreateWebContents();
  tabstrip()->InsertWebContentsAt(
      2, std::move(opened_contents),
      AddTabTypes::ADD_ACTIVE | AddTabTypes::ADD_INHERIT_OPENER);
  ASSERT_EQ(2, tabstrip()->active_index());

  tabstrip()->CloseWebContentsAt(2, TabCloseTypes::CLOSE_NONE);
  EXPECT_EQ(0, tabstrip()->active_index());

  tabstrip()->CloseAllTabs();
  ASSERT_TRUE(tabstrip()->empty());
}

TEST_F(TabStripModelTest, IsContextMenuCommandEnabledBadIndex) {
  constexpr int kTestTabCount = 1;

  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), kTestTabCount, 0, {0}));
  ASSERT_EQ(kTestTabCount, tabstrip()->count());
  ASSERT_FALSE(tabstrip()->ContainsIndex(kTestTabCount));

  // kNoTabs should return false for context menu commands being enabled.
  EXPECT_FALSE(tabstrip()->IsContextMenuCommandEnabled(
      TabStripModel::kNoTab, TabStripModel::CommandCloseTab));

  // Indexes out of bounds should return false for context menu
  // commands being enabled.
  EXPECT_FALSE(tabstrip()->IsContextMenuCommandEnabled(
      kTestTabCount, TabStripModel::CommandCloseTab));
}

// Tests IsContextMenuCommandEnabled and ExecuteContextMenuCommand with
// CommandCloseTab.
TEST_F(TabStripModelTest, CommandCloseTab) {
  // Make sure can_close is honored.
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 1, 0, {0}));
  EXPECT_TRUE(tabstrip()->IsContextMenuCommandEnabled(
      0, TabStripModel::CommandCloseTab));
  tabstrip()->ExecuteContextMenuCommand(0, TabStripModel::CommandCloseTab);
  ASSERT_TRUE(tabstrip()->empty());

  // Make sure close on a tab that is selected affects all the selected tabs.
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 3, 0, {0, 1}));
  EXPECT_TRUE(tabstrip()->IsContextMenuCommandEnabled(
      0, TabStripModel::CommandCloseTab));
  tabstrip()->ExecuteContextMenuCommand(0, TabStripModel::CommandCloseTab);
  // Should have closed tabs 0 and 1.
  EXPECT_EQ("2", GetTabStripStateString(tabstrip()));

  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());

  // Select two tabs and make close on a tab that isn't selected doesn't affect
  // selected tabs.
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 3, 0, {0, 1}));
  EXPECT_TRUE(tabstrip()->IsContextMenuCommandEnabled(
      2, TabStripModel::CommandCloseTab));
  tabstrip()->ExecuteContextMenuCommand(2, TabStripModel::CommandCloseTab);
  // Should have closed tab 2.
  EXPECT_EQ("0 1", GetTabStripStateString(tabstrip()));
  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());

  // Tests with 3 tabs, one pinned, two tab selected, one of which is pinned.
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 3, 1, {0, 1}));
  EXPECT_TRUE(tabstrip()->IsContextMenuCommandEnabled(
      0, TabStripModel::CommandCloseTab));
  tabstrip()->ExecuteContextMenuCommand(0, TabStripModel::CommandCloseTab);
  // Should have closed tab 2.
  EXPECT_EQ("2", GetTabStripStateString(tabstrip()));
  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());
}

// Tests IsContextMenuCommandEnabled and ExecuteContextMenuCommand with
// CommandCloseOtherTabs.
TEST_F(TabStripModelTest, CommandCloseOtherTabs) {
  // Create three tabs, select two tabs, CommandCloseOtherTabs should be enabled
  // and close two tabs.
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 3, 0, {0, 1}));
  EXPECT_TRUE(tabstrip()->IsContextMenuCommandEnabled(
      0, TabStripModel::CommandCloseOtherTabs));
  tabstrip()->ExecuteContextMenuCommand(0,
                                        TabStripModel::CommandCloseOtherTabs);
  EXPECT_EQ("0 1", GetTabStripStateString(tabstrip()));
  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());

  // Select two tabs, CommandCloseOtherTabs should be enabled and invoking it
  // with a non-selected index should close the two other tabs.
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 3, 0, {0, 1}));
  EXPECT_TRUE(tabstrip()->IsContextMenuCommandEnabled(
      2, TabStripModel::CommandCloseOtherTabs));
  tabstrip()->ExecuteContextMenuCommand(0,
                                        TabStripModel::CommandCloseOtherTabs);
  EXPECT_EQ("0 1", GetTabStripStateString(tabstrip()));
  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());

  // Select all, CommandCloseOtherTabs should not be enabled.
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 3, 0, {0, 1, 2}));
  EXPECT_FALSE(tabstrip()->IsContextMenuCommandEnabled(
      2, TabStripModel::CommandCloseOtherTabs));
  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());

  // Three tabs, pin one, select the two non-pinned.
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 3, 1, {1, 2}));
  EXPECT_FALSE(tabstrip()->IsContextMenuCommandEnabled(
      1, TabStripModel::CommandCloseOtherTabs));
  // If we don't pass in the pinned index, the command should be enabled.
  EXPECT_TRUE(tabstrip()->IsContextMenuCommandEnabled(
      0, TabStripModel::CommandCloseOtherTabs));
  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());

  // 3 tabs, one pinned.
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 3, 1, {1}));
  EXPECT_TRUE(tabstrip()->IsContextMenuCommandEnabled(
      1, TabStripModel::CommandCloseOtherTabs));
  EXPECT_TRUE(tabstrip()->IsContextMenuCommandEnabled(
      0, TabStripModel::CommandCloseOtherTabs));
  tabstrip()->ExecuteContextMenuCommand(1,
                                        TabStripModel::CommandCloseOtherTabs);
  // The pinned tab shouldn't be closed.
  EXPECT_EQ("0p 1", GetTabStripStateString(tabstrip()));
  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());

  // Unselected split tab.
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 4, 1, {1}));
  tabstrip()->AddToNewSplit({2}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);
  tabstrip()->ActivateTabAt(3);
  ASSERT_EQ("0p 1s 2s 3", GetTabStripStateString(tabstrip()));
  EXPECT_TRUE(tabstrip()->IsContextMenuCommandEnabled(
      1, TabStripModel::CommandCloseOtherTabs));
  EXPECT_TRUE(tabstrip()->IsContextMenuCommandEnabled(
      2, TabStripModel::CommandCloseOtherTabs));
  tabstrip()->ExecuteContextMenuCommand(1,
                                        TabStripModel::CommandCloseOtherTabs);
  // The pinned tab and the other tab in the split shouldn't be closed.
  EXPECT_EQ("0p 1s 2s", GetTabStripStateString(tabstrip()));
  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());
}

// Tests IsContextMenuCommandEnabled and ExecuteContextMenuCommand with
// CommandCloseTabsToRight.
TEST_F(TabStripModelTest, CommandCloseTabsToRight) {
  // Create three tabs, select last two tabs, CommandCloseTabsToRight should
  // only be enabled for the first tab.
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 3, 0, {1, 2}));
  EXPECT_TRUE(tabstrip()->IsContextMenuCommandEnabled(
      0, TabStripModel::CommandCloseTabsToRight));
  EXPECT_FALSE(tabstrip()->IsContextMenuCommandEnabled(
      1, TabStripModel::CommandCloseTabsToRight));
  EXPECT_FALSE(tabstrip()->IsContextMenuCommandEnabled(
      2, TabStripModel::CommandCloseTabsToRight));
  tabstrip()->ExecuteContextMenuCommand(0,
                                        TabStripModel::CommandCloseTabsToRight);
  EXPECT_EQ("0", GetTabStripStateString(tabstrip()));
  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());

  // Unselected split tab.
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 4, 1, {1}));
  tabstrip()->AddToNewSplit({2}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);
  tabstrip()->ActivateTabAt(3);
  ASSERT_EQ("0p 1s 2s 3", GetTabStripStateString(tabstrip()));
  EXPECT_TRUE(tabstrip()->IsContextMenuCommandEnabled(
      1, TabStripModel::CommandCloseTabsToRight));
  EXPECT_TRUE(tabstrip()->IsContextMenuCommandEnabled(
      2, TabStripModel::CommandCloseTabsToRight));
  tabstrip()->ExecuteContextMenuCommand(1,
                                        TabStripModel::CommandCloseTabsToRight);
  // The pinned tab and the other tab in the split shouldn't be closed.
  EXPECT_EQ("0p 1s 2s", GetTabStripStateString(tabstrip()));
  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());
}

// Tests IsContextMenuCommandEnabled and ExecuteContextMenuCommand with
// CommandTogglePinned.
TEST_F(TabStripModelTest, CommandTogglePinned) {
  // Create three tabs with one pinned, pin the first two.
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 3, 1, {0, 1}));
  EXPECT_TRUE(tabstrip()->IsContextMenuCommandEnabled(
      0, TabStripModel::CommandTogglePinned));
  EXPECT_TRUE(tabstrip()->IsContextMenuCommandEnabled(
      1, TabStripModel::CommandTogglePinned));
  EXPECT_TRUE(tabstrip()->IsContextMenuCommandEnabled(
      2, TabStripModel::CommandTogglePinned));
  tabstrip()->ExecuteContextMenuCommand(0, TabStripModel::CommandTogglePinned);
  EXPECT_EQ("0p 1p 2", GetTabStripStateString(tabstrip()));

  // Execute CommandTogglePinned again, this should unpin.
  tabstrip()->ExecuteContextMenuCommand(0, TabStripModel::CommandTogglePinned);
  EXPECT_EQ("0 1 2", GetTabStripStateString(tabstrip()));

  // Pin the last.
  tabstrip()->ExecuteContextMenuCommand(2, TabStripModel::CommandTogglePinned);
  EXPECT_EQ("2p 0 1", GetTabStripStateString(tabstrip()));

  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());
}

TEST_F(TabStripModelTest, SplitTabPinning) {
  for (bool split_is_selected : {true, false}) {
    for (bool use_left_tab : {true, false}) {
      ASSERT_NO_FATAL_FAILURE(
          PrepareTabstripForSelectionTest(tabstrip(), 5, 1, {2}));
      tabstrip()->AddToNewSplit(
          {3}, split_tabs::SplitTabVisualData(),
          split_tabs::SplitTabCreatedSource::kToolbarButton);
      ASSERT_EQ("0p 1 2s 3s 4", GetTabStripStateString(tabstrip()));
      if (!split_is_selected) {
        tabstrip()->ActivateTabAt(1);
      }

      tabstrip()->ExecuteContextMenuCommand(2 + !use_left_tab,
                                            TabStripModel::CommandTogglePinned);
      EXPECT_EQ("0p 2ps 3ps 1 4", GetTabStripStateString(tabstrip()));

      tabstrip()->ExecuteContextMenuCommand(1 + !use_left_tab,
                                            TabStripModel::CommandTogglePinned);
      EXPECT_EQ("0p 2s 3s 1 4", GetTabStripStateString(tabstrip()));

      tabstrip()->CloseAllTabs();
      EXPECT_TRUE(tabstrip()->empty());
    }
  }
}

TEST_F(TabStripModelTest, SplitTabPinningBulk) {
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 12, 2, {4}));
  tabstrip()->AddToNewSplit({5}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);
  ASSERT_EQ("0p 1p 2 3 4s 5s 6 7 8 9 10 11",
            GetTabStripStateString(tabstrip()));
  tabstrip()->ActivateTabAt(8);
  tabstrip()->AddToNewSplit({9}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);
  ASSERT_EQ("0p 1p 2 3 4s 5s 6 7 8s 9s 10 11",
            GetTabStripStateString(tabstrip()));
  tabstrip()->SelectTabAt(0);
  tabstrip()->SelectTabAt(2);
  tabstrip()->SelectTabAt(4);
  tabstrip()->SelectTabAt(5);
  tabstrip()->SelectTabAt(7);
  tabstrip()->SelectTabAt(10);
  // tabs 0 2 4 5 7 8 9 10 should be selected
  ASSERT_EQ(base::MakeFlatSet<size_t>(std::vector{0, 2, 4, 5, 7, 8, 9, 10}),
            tabstrip()->selection_model().selected_indices());

  // pin multiple selected tabs and splits
  tabstrip()->ExecuteContextMenuCommand(
      5, TabStripModel::CommandTogglePinned);  // tab 5
  EXPECT_EQ("0p 1p 2p 4ps 5ps 7p 8ps 9ps 10p 3 6 11",
            GetTabStripStateString(tabstrip()));

  // unpin multiple selected tabs and splits
  tabstrip()->DeselectTabAt(2);  // tab 2
  tabstrip()->DeselectTabAt(8);  // tab 10
  // tabs 0 4 5 7 8 9 should be selected
  ASSERT_EQ(base::MakeFlatSet<size_t>(std::vector{0, 3, 4, 5, 6, 7}),
            tabstrip()->selection_model().selected_indices());
  tabstrip()->ExecuteContextMenuCommand(
      0, TabStripModel::CommandTogglePinned);  // tab 0
  EXPECT_EQ("1p 2p 10p 0 4s 5s 7 8s 9s 3 6 11",
            GetTabStripStateString(tabstrip()));

  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());
}

TEST_F(TabStripModelTest, RestoreSplit) {
  // Create five tabs with two pinned.
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 5, 2, {2}));
  split_tabs::SplitTabId split_id = split_tabs::SplitTabId::GenerateNew();
  // Add tab at index 2 and 3 to a split.
  tabstrip()->RestoreSplit(split_id, {2, 3}, split_tabs::SplitTabVisualData());

  EXPECT_EQ("0p 1p 2s 3s 4", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(tabstrip()->GetSplitData(split_id)->ListTabs().size(), 2u);

  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());
}

TEST_F(TabStripModelTest, AddToSplitInGroup) {
  // Create five tabs with two pinned.
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 5, 2, {2}));

  // Add tab at index 4 to a group.
  tab_groups::TabGroupId group_id = tabstrip()->AddToNewGroup({4});
  tabstrip()->ActivateTabAt(
      4, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));

  tabstrip()->AddToNewSplit({2}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);

  EXPECT_EQ("0p 1p 3 2s 4s", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(
      tabstrip()->group_model()->GetTabGroup(group_id)->ListTabs().length(),
      2u);

  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());
}

TEST_F(TabStripModelTest, AddToSplitInPinned) {
  // Create five tabs with two pinned.
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 5, 2, {2}));

  // Add tab at index 4 to a group.
  tabstrip()->AddToNewGroup({4});
  tabstrip()->ActivateTabAt(
      0, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));

  tabstrip()->AddToNewSplit({3}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);

  EXPECT_EQ("0ps 3ps 1p 2 4", GetTabStripStateString(tabstrip()));

  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());
}

TEST_F(TabStripModelTest, AddToSplitInSelected) {
  // Create five tabs.
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 5, 0, {2}));

  tabstrip()->ActivateTabAt(0);
  tabstrip()->AddToNewSplit({1}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);

  EXPECT_EQ("0s 1s 2 3 4", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(tabstrip()->active_index(), 0);
  EXPECT_TRUE(tabstrip()->selection_model().IsSelected(0));
  EXPECT_TRUE(tabstrip()->selection_model().IsSelected(1));

  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());
}

TEST_F(TabStripModelTest, UnsplitOperation) {
  // Create five tabs with two pinned.
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 5, 2, {2}));

  // Add tab at index 4 to a group.
  tabstrip()->AddToNewGroup({4});
  tabstrip()->ActivateTabAt(
      0, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));

  split_tabs::SplitTabId split_tab_id = tabstrip()->AddToNewSplit(
      {3}, split_tabs::SplitTabVisualData(),
      split_tabs::SplitTabCreatedSource::kToolbarButton);

  EXPECT_EQ("0ps 3ps 1p 2 4", GetTabStripStateString(tabstrip()));

  tabstrip()->RemoveSplit(split_tab_id);
  EXPECT_EQ("0p 3p 1p 2 4", GetTabStripStateString(tabstrip()));

  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());
}

TEST_F(TabStripModelTest, MoveInsideSplitRemovesSplit) {
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 5, 0, {2}));

  tabstrip()->ActivateTabAt(
      0, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));

  split_tabs::SplitTabId split_tab_id = tabstrip()->AddToNewSplit(
      {3}, split_tabs::SplitTabVisualData(),
      split_tabs::SplitTabCreatedSource::kToolbarButton);

  EXPECT_EQ(tabstrip()->GetSplitData(split_tab_id)->ListTabs().size(), 2u);
  tabstrip()->MoveWebContentsAt(3, 1, false);
  EXPECT_FALSE(tabstrip()->ContainsSplit(split_tab_id));

  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());
}

TEST_F(TabStripModelTest, MoveFromSplitRemovesSplit) {
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 5, 0, {2}));

  tabstrip()->ActivateTabAt(
      0, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));

  split_tabs::SplitTabId split_tab_id = tabstrip()->AddToNewSplit(
      {1}, split_tabs::SplitTabVisualData(),
      split_tabs::SplitTabCreatedSource::kToolbarButton);

  EXPECT_EQ(tabstrip()->GetSplitData(split_tab_id)->ListTabs().size(), 2u);
  tabstrip()->MoveWebContentsAt(1, 3, false);
  EXPECT_FALSE(tabstrip()->ContainsSplit(split_tab_id));

  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());
}

TEST_F(TabStripModelTest, AddTabInsideSplitRemovesSplit) {
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 5, 0, {2}));

  tabstrip()->ActivateTabAt(
      0, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));

  split_tabs::SplitTabId split_tab_id = tabstrip()->AddToNewSplit(
      {1}, split_tabs::SplitTabVisualData(),
      split_tabs::SplitTabCreatedSource::kToolbarButton);

  EXPECT_EQ(tabstrip()->GetSplitData(split_tab_id)->ListTabs().size(), 2u);

  std::unique_ptr<WebContents> new_blank_contents = CreateWebContents();
  tabstrip()->InsertWebContentsAt(1, std::move(new_blank_contents),
                                  AddTabTypes::ADD_NONE);
  EXPECT_FALSE(tabstrip()->ContainsSplit(split_tab_id));

  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());
}

TEST_F(TabStripModelTest, RemoveSplitTabRemovesEntireSplit) {
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 5, 0, {2}));

  tabstrip()->ActivateTabAt(
      0, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));

  split_tabs::SplitTabId split_tab_id = tabstrip()->AddToNewSplit(
      {1}, split_tabs::SplitTabVisualData(),
      split_tabs::SplitTabCreatedSource::kToolbarButton);

  EXPECT_EQ(tabstrip()->GetSplitData(split_tab_id)->ListTabs().size(), 2u);

  tabstrip()->CloseWebContentsAt(1, TabCloseTypes::CLOSE_NONE);
  EXPECT_FALSE(tabstrip()->ContainsSplit(split_tab_id));

  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());
}

TEST_F(TabStripModelTest, MoveGroupWithinSplitRemovesSplit) {
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 5, 0, {2}));

  tabstrip()->ActivateTabAt(
      3, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));

  split_tabs::SplitTabId split_tab_id = tabstrip()->AddToNewSplit(
      {4}, split_tabs::SplitTabVisualData(),
      split_tabs::SplitTabCreatedSource::kToolbarButton);

  EXPECT_EQ(tabstrip()->GetSplitData(split_tab_id)->ListTabs().size(), 2u);
  tab_groups::TabGroupId group_id = tabstrip()->AddToNewGroup({0, 1});
  tabstrip()->MoveGroupTo(group_id, 2);
  EXPECT_FALSE(tabstrip()->ContainsSplit(split_tab_id));

  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());
}

TEST_F(TabStripModelTest, SplitLayoutTest) {
  // Create five tabs with two pinned, select the last.
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 5, 2, {2}));

  // Add tab at index 4 to a group.
  tabstrip()->AddToNewGroup({4});
  tabstrip()->ActivateTabAt(
      0, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));

  split_tabs::SplitTabId split_tab_id = tabstrip()->AddToNewSplit(
      {3}, split_tabs::SplitTabVisualData(),
      split_tabs::SplitTabCreatedSource::kToolbarButton);

  EXPECT_EQ("0ps 3ps 1p 2 4", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(
      tabstrip()->GetSplitData(split_tab_id)->visual_data()->split_layout(),
      split_tabs::SplitTabLayout::kVertical);

  tabstrip()->UpdateSplitLayout(split_tab_id,
                                split_tabs::SplitTabLayout::kHorizontal);
  EXPECT_EQ(
      tabstrip()->GetSplitData(split_tab_id)->visual_data()->split_layout(),
      split_tabs::SplitTabLayout::kHorizontal);

  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());
}

TEST_F(TabStripModelTest, SplitRatioTest) {
  // Create five tabs with two pinned, select the last.
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 5, 2, {2}));

  // Add tab at index 4 to a group.
  tabstrip()->AddToNewGroup({4});
  tabstrip()->ActivateTabAt(
      0, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));

  split_tabs::SplitTabId split_tab_id = tabstrip()->AddToNewSplit(
      {3}, split_tabs::SplitTabVisualData(),
      split_tabs::SplitTabCreatedSource::kToolbarButton);

  EXPECT_EQ("0ps 3ps 1p 2 4", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(
      tabstrip()->GetSplitData(split_tab_id)->visual_data()->split_layout(),
      split_tabs::SplitTabLayout::kVertical);

  tabstrip()->UpdateSplitRatio(split_tab_id, 0.7);
  EXPECT_EQ(
      tabstrip()->GetSplitData(split_tab_id)->visual_data()->split_ratio(),
      0.7);

  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());
}

TEST_F(TabStripModelTest, ReplaceActiveTabInSplit) {
  // Create five tabs with two pinned, select the last.
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 5, 2, {2}));

  // Add tab at index 4 to a group.
  tabstrip()->AddToNewGroup({4});
  tabstrip()->ActivateTabAt(
      0, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));

  tabstrip()->AddToNewSplit({3}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);

  EXPECT_EQ("0ps 3ps 1p 2 4", GetTabStripStateString(tabstrip()));

  tabstrip()->UpdateTabInSplit(tabstrip()->GetTabAtIndex(0), 3,
                               TabStripModel::SplitUpdateType::kReplace);
  EXPECT_EQ("2ps 3ps 1p 4", GetTabStripStateString(tabstrip()));

  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());
}

TEST_F(TabStripModelTest, SwapActiveTabInSplit) {
  // Create five tabs with two pinned, select the last.
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 5, 2, {2}));

  tabstrip()->ActivateTabAt(
      0, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));

  tabstrip()->AddToNewSplit({3}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);

  EXPECT_EQ("0ps 3ps 1p 2 4", GetTabStripStateString(tabstrip()));

  tabstrip()->UpdateTabInSplit(tabstrip()->GetTabAtIndex(0), 3,
                               TabStripModel::SplitUpdateType::kSwap);
  EXPECT_EQ("2ps 3ps 1p 0 4", GetTabStripStateString(tabstrip()));

  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());
}

TEST_F(TabStripModelTest, SwapActiveTabInSplitWithOnlyTabInGroup) {
  // Create five tabs with two pinned, select the last.
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 5, 2, {2}));

  tabstrip()->ActivateTabAt(
      0, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));

  tabstrip()->AddToNewSplit({3}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);

  EXPECT_EQ("0ps 3ps 1p 2 4", GetTabStripStateString(tabstrip()));

  tab_groups::TabGroupId update_group_id = tabstrip()->AddToNewGroup({3});

  tabstrip()->UpdateTabInSplit(tabstrip()->GetTabAtIndex(0), 3,
                               TabStripModel::SplitUpdateType::kSwap);
  EXPECT_EQ("2ps 3ps 1p 0 4", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(tabstrip()->GetTabGroupForTab(3), update_group_id);
  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());
}

TEST_F(TabStripModelTest, ReverseTabsInSplit) {
  // Create five tabs with two pinned, select the last.
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 5, 2, {2}));

  // Add tab at index 4 to a group.
  tabstrip()->AddToNewGroup({4});
  tabstrip()->ActivateTabAt(
      0, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));

  split_tabs::SplitTabId split_tab_id = tabstrip()->AddToNewSplit(
      {3}, split_tabs::SplitTabVisualData(),
      split_tabs::SplitTabCreatedSource::kToolbarButton);

  EXPECT_EQ("0ps 3ps 1p 2 4", GetTabStripStateString(tabstrip()));
  std::vector<tabs::TabInterface*> old_tabs =
      tabstrip()->GetSplitData(split_tab_id)->ListTabs();
  EXPECT_EQ(2ul, old_tabs.size());

  tabstrip()->ReverseTabsInSplit(split_tab_id);

  EXPECT_EQ("3ps 0ps 1p 2 4", GetTabStripStateString(tabstrip()));
  std::vector<tabs::TabInterface*> new_tabs =
      tabstrip()->GetSplitData(split_tab_id)->ListTabs();
  EXPECT_EQ(2ul, new_tabs.size());
  EXPECT_EQ(old_tabs[1], new_tabs[0]);
  EXPECT_EQ(old_tabs[0], new_tabs[1]);

  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());
}

TEST_F(TabStripModelTest, ReverseAndReplaceTabsInSplit) {
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 3, 0, {1}));

  tabstrip()->ActivateTabAt(
      2, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));

  split_tabs::SplitTabId split_tab_id = tabstrip()->AddToNewSplit(
      {1}, split_tabs::SplitTabVisualData(),
      split_tabs::SplitTabCreatedSource::kToolbarButton);
  EXPECT_EQ("0 1s 2s", GetTabStripStateString(tabstrip()));

  tabstrip()->ReverseTabsInSplit(split_tab_id);
  EXPECT_EQ("0 2s 1s", GetTabStripStateString(tabstrip()));

  tabstrip()->UpdateTabInSplit(tabstrip()->GetTabAtIndex(1), 0,
                               TabStripModel::SplitUpdateType::kReplace);
  EXPECT_EQ("0s 1s", GetTabStripStateString(tabstrip()));

  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());
}

// Tests IsContextMenuCommandEnabled and ExecuteContextMenuCommand with
// CommandToggleGrouped.
TEST_F(TabStripModelTest, CommandToggleGrouped) {
  ASSERT_TRUE(tabstrip()->SupportsTabGroups());

  // Create three tabs, select the first two, and add the first to a group.
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 3, 0, {0, 1}));
  tab_groups::TabGroupId original_group = tabstrip()->AddToNewGroup({0});
  ASSERT_TRUE(tabstrip()->GetTabGroupForTab(0).has_value());

  EXPECT_TRUE(tabstrip()->IsContextMenuCommandEnabled(
      0, TabStripModel::CommandToggleGrouped));
  EXPECT_TRUE(tabstrip()->IsContextMenuCommandEnabled(
      1, TabStripModel::CommandToggleGrouped));
  EXPECT_TRUE(tabstrip()->IsContextMenuCommandEnabled(
      2, TabStripModel::CommandToggleGrouped));

  // Execute CommandToggleGrouped once. Expect both tabs to be in a new group,
  // since they weren't already in the same group.
  tabstrip()->ExecuteContextMenuCommand(0, TabStripModel::CommandToggleGrouped);
  EXPECT_TRUE(tabstrip()->GetTabGroupForTab(0).has_value());
  EXPECT_EQ(tabstrip()->GetTabGroupForTab(0), tabstrip()->GetTabGroupForTab(1));
  EXPECT_NE(tabstrip()->GetTabGroupForTab(0), original_group);

  // Only the active tab will remain selected when adding multiple tabs to a
  // group; all selected tabs continue to be selected when removing multiple
  // tabs from a group.
  tabstrip()->SelectTabAt(1);

  // Execute CommandToggleGrouped again. Expect both tabs to be ungrouped, since
  // they were in the same group.
  tabstrip()->ExecuteContextMenuCommand(0, TabStripModel::CommandToggleGrouped);
  EXPECT_FALSE(tabstrip()->GetTabGroupForTab(0).has_value());
  EXPECT_FALSE(tabstrip()->GetTabGroupForTab(1).has_value());

  // Execute CommandToggleGrouped again. Expect both tabs to be grouped again.
  tabstrip()->ExecuteContextMenuCommand(0, TabStripModel::CommandToggleGrouped);
  EXPECT_TRUE(tabstrip()->GetTabGroupForTab(0).has_value());
  EXPECT_EQ(tabstrip()->GetTabGroupForTab(0), tabstrip()->GetTabGroupForTab(1));

  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());
}

// Tests the following context menu commands:
//  - Close Tab
//  - Close Other Tabs
//  - Close Tabs To Right
TEST_F(TabStripModelTest, TestContextMenuCloseCommands) {
  std::unique_ptr<WebContents> opener = CreateWebContents();
  WebContents* raw_opener = opener.get();
  tabstrip()->AppendWebContents(std::move(opener), true);

  std::unique_ptr<WebContents> contents1 = CreateWebContents();
  std::unique_ptr<WebContents> contents2 = CreateWebContents();
  std::unique_ptr<WebContents> contents3 = CreateWebContents();

  InsertWebContentses(tabstrip(), std::move(contents1), std::move(contents2),
                      std::move(contents3));
  EXPECT_EQ(0, tabstrip()->active_index());

  tabstrip()->ExecuteContextMenuCommand(2, TabStripModel::CommandCloseTab);
  EXPECT_EQ(3, tabstrip()->count());

  tabstrip()->ExecuteContextMenuCommand(0,
                                        TabStripModel::CommandCloseTabsToRight);
  EXPECT_EQ(1, tabstrip()->count());
  EXPECT_EQ(raw_opener, tabstrip()->GetActiveWebContents());

  std::unique_ptr<WebContents> dummy = CreateWebContents();
  WebContents* raw_dummy = dummy.get();
  tabstrip()->AppendWebContents(std::move(dummy), false);

  contents1 = CreateWebContents();
  contents2 = CreateWebContents();
  contents3 = CreateWebContents();
  InsertWebContentses(tabstrip(), std::move(contents1), std::move(contents2),
                      std::move(contents3));
  EXPECT_EQ(5, tabstrip()->count());

  int dummy_index = tabstrip()->count() - 1;
  tabstrip()->ActivateTabAt(
      dummy_index, TabStripUserGestureDetails(
                       TabStripUserGestureDetails::GestureType::kOther));
  EXPECT_EQ(raw_dummy, tabstrip()->GetActiveWebContents());

  tabstrip()->ExecuteContextMenuCommand(dummy_index,
                                        TabStripModel::CommandCloseOtherTabs);
  EXPECT_EQ(1, tabstrip()->count());
  EXPECT_EQ(raw_dummy, tabstrip()->GetActiveWebContents());

  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());
}

TEST_F(TabStripModelTest, GetIndicesClosedByCommand) {
  const auto indicesClosedAsString =
      [this](int index, TabStripModel::ContextMenuCommand id) {
        std::vector<int> indices =
            tabstrip()->GetIndicesClosedByCommand(index, id);
        std::string result;
        for (size_t i = 0; i < indices.size(); ++i) {
          if (i != 0) {
            result += " ";
          }
          result += base::NumberToString(indices[i]);
        }
        return result;
      };

  for (int i = 0; i < 5; ++i) {
    tabstrip()->AppendWebContents(CreateWebContents(), true);
  }

  EXPECT_EQ("4 3 2 1",
            indicesClosedAsString(0, TabStripModel::CommandCloseTabsToRight));
  EXPECT_EQ("4 3 2",
            indicesClosedAsString(1, TabStripModel::CommandCloseTabsToRight));

  EXPECT_EQ("4 3 2 1",
            indicesClosedAsString(0, TabStripModel::CommandCloseOtherTabs));
  EXPECT_EQ("4 3 2 0",
            indicesClosedAsString(1, TabStripModel::CommandCloseOtherTabs));

  // Pin the first two tabs. Pinned tabs shouldn't be closed by the close other
  // commands.
  tabstrip()->SetTabPinned(0, true);
  tabstrip()->SetTabPinned(1, true);

  EXPECT_EQ("4 3 2",
            indicesClosedAsString(0, TabStripModel::CommandCloseTabsToRight));
  EXPECT_EQ("4 3",
            indicesClosedAsString(2, TabStripModel::CommandCloseTabsToRight));

  EXPECT_EQ("4 3 2",
            indicesClosedAsString(0, TabStripModel::CommandCloseOtherTabs));
  EXPECT_EQ("4 3",
            indicesClosedAsString(2, TabStripModel::CommandCloseOtherTabs));

  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());
}

// Tests whether or not WebContentses are inserted in the correct position
// using this "smart" function with a simulated middle click action on a series
// of links on the home page.
TEST_F(TabStripModelTest, AddWebContents_MiddleClickLinksAndClose) {

  // Open the Home Page.
  std::unique_ptr<WebContents> homepage_contents = CreateWebContents();
  WebContents* raw_homepage_contents = homepage_contents.get();
  tabstrip()->AddWebContents(std::move(homepage_contents), -1,
                             ui::PAGE_TRANSITION_AUTO_BOOKMARK,
                             AddTabTypes::ADD_ACTIVE);

  // Open some other tab, by user typing.
  std::unique_ptr<WebContents> typed_page_contents = CreateWebContents();
  WebContents* raw_typed_page_contents = typed_page_contents.get();
  tabstrip()->AddWebContents(std::move(typed_page_contents), -1,
                             ui::PAGE_TRANSITION_TYPED,
                             AddTabTypes::ADD_ACTIVE);

  EXPECT_EQ(2, tabstrip()->count());

  // Re-select the home page.
  tabstrip()->ActivateTabAt(
      0, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));

  // Open a bunch of tabs by simulating middle clicking on links on the home
  // page.
  std::unique_ptr<WebContents> middle_click_contents1 = CreateWebContents();
  WebContents* raw_middle_click_contents1 = middle_click_contents1.get();
  tabstrip()->AddWebContents(std::move(middle_click_contents1), -1,
                             ui::PAGE_TRANSITION_LINK, AddTabTypes::ADD_NONE);
  std::unique_ptr<WebContents> middle_click_contents2 = CreateWebContents();
  WebContents* raw_middle_click_contents2 = middle_click_contents2.get();
  tabstrip()->AddWebContents(std::move(middle_click_contents2), -1,
                             ui::PAGE_TRANSITION_LINK, AddTabTypes::ADD_NONE);
  std::unique_ptr<WebContents> middle_click_contents3 = CreateWebContents();
  WebContents* raw_middle_click_contents3 = middle_click_contents3.get();
  tabstrip()->AddWebContents(std::move(middle_click_contents3), -1,
                             ui::PAGE_TRANSITION_LINK, AddTabTypes::ADD_NONE);

  EXPECT_EQ(5, tabstrip()->count());

  EXPECT_EQ(raw_homepage_contents, tabstrip()->GetWebContentsAt(0));
  EXPECT_EQ(raw_middle_click_contents1, tabstrip()->GetWebContentsAt(1));
  EXPECT_EQ(raw_middle_click_contents2, tabstrip()->GetWebContentsAt(2));
  EXPECT_EQ(raw_middle_click_contents3, tabstrip()->GetWebContentsAt(3));
  EXPECT_EQ(raw_typed_page_contents, tabstrip()->GetWebContentsAt(4));

  // Select a tab in the middle of the tabs opened from the home page and start
  // closing them. Each WebContents should be closed, right to left. This test
  // is constructed to start at the middle WebContents in the tree to make sure
  // the cursor wraps around to the first WebContents in the tree before
  // closing the opener or any other WebContents.
  tabstrip()->ActivateTabAt(
      2, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));
  tabstrip()->CloseSelectedTabs();
  EXPECT_EQ(raw_middle_click_contents3, tabstrip()->GetActiveWebContents());
  tabstrip()->CloseSelectedTabs();
  EXPECT_EQ(raw_middle_click_contents1, tabstrip()->GetActiveWebContents());
  tabstrip()->CloseSelectedTabs();
  EXPECT_EQ(raw_homepage_contents, tabstrip()->GetActiveWebContents());
  tabstrip()->CloseSelectedTabs();
  EXPECT_EQ(raw_typed_page_contents, tabstrip()->GetActiveWebContents());

  EXPECT_EQ(1, tabstrip()->count());

  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());
}

// Tests whether or not a WebContents created by a left click on a link
// that opens a new tab is inserted correctly adjacent to the tab that spawned
// it.
TEST_F(TabStripModelTest, AddWebContents_LeftClickPopup) {

  // Open the Home Page.
  std::unique_ptr<WebContents> homepage_contents = CreateWebContents();
  WebContents* raw_homepage_contents = homepage_contents.get();
  tabstrip()->AddWebContents(std::move(homepage_contents), -1,
                             ui::PAGE_TRANSITION_AUTO_BOOKMARK,
                             AddTabTypes::ADD_ACTIVE);

  // Open some other tab, by user typing.
  std::unique_ptr<WebContents> typed_page_contents = CreateWebContents();
  WebContents* raw_typed_page_contents = typed_page_contents.get();
  tabstrip()->AddWebContents(std::move(typed_page_contents), -1,
                             ui::PAGE_TRANSITION_TYPED,
                             AddTabTypes::ADD_ACTIVE);

  EXPECT_EQ(2, tabstrip()->count());

  // Re-select the home page.
  tabstrip()->ActivateTabAt(
      0, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));

  // Open a tab by simulating a left click on a link that opens in a new tab.
  std::unique_ptr<WebContents> left_click_contents = CreateWebContents();
  WebContents* raw_left_click_contents = left_click_contents.get();
  tabstrip()->AddWebContents(std::move(left_click_contents), -1,
                             ui::PAGE_TRANSITION_LINK, AddTabTypes::ADD_ACTIVE);

  // Verify the state meets our expectations.
  EXPECT_EQ(3, tabstrip()->count());
  EXPECT_EQ(raw_homepage_contents, tabstrip()->GetWebContentsAt(0));
  EXPECT_EQ(raw_left_click_contents, tabstrip()->GetWebContentsAt(1));
  EXPECT_EQ(raw_typed_page_contents, tabstrip()->GetWebContentsAt(2));

  // The newly created tab should be selected.
  EXPECT_EQ(raw_left_click_contents, tabstrip()->GetActiveWebContents());

  // After closing the selected tab, the selection should move to the left, to
  // the opener.
  tabstrip()->CloseSelectedTabs();
  EXPECT_EQ(raw_homepage_contents, tabstrip()->GetActiveWebContents());

  EXPECT_EQ(2, tabstrip()->count());

  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());
}

// Tests whether or not new tabs that should split context (typed pages,
// generated urls, also blank tabs) open at the end of the tabstrip instead of
// in the middle.
TEST_F(TabStripModelTest, AddWebContents_CreateNewBlankTab) {

  // Open the Home Page.
  std::unique_ptr<WebContents> homepage_contents = CreateWebContents();
  WebContents* raw_homepage_contents = homepage_contents.get();
  tabstrip()->AddWebContents(std::move(homepage_contents), -1,
                             ui::PAGE_TRANSITION_AUTO_BOOKMARK,
                             AddTabTypes::ADD_ACTIVE);

  // Open some other tab, by user typing.
  std::unique_ptr<WebContents> typed_page_contents = CreateWebContents();
  WebContents* raw_typed_page_contents = typed_page_contents.get();
  tabstrip()->AddWebContents(std::move(typed_page_contents), -1,
                             ui::PAGE_TRANSITION_TYPED,
                             AddTabTypes::ADD_ACTIVE);

  EXPECT_EQ(2, tabstrip()->count());

  // Re-select the home page.
  tabstrip()->ActivateTabAt(
      0, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));

  // Open a new blank tab in the foreground.
  std::unique_ptr<WebContents> new_blank_contents = CreateWebContents();
  WebContents* raw_new_blank_contents = new_blank_contents.get();
  tabstrip()->AddWebContents(std::move(new_blank_contents), -1,
                             ui::PAGE_TRANSITION_TYPED,
                             AddTabTypes::ADD_ACTIVE);

  // Verify the state of the tabstrip()->
  EXPECT_EQ(3, tabstrip()->count());
  EXPECT_EQ(raw_homepage_contents, tabstrip()->GetWebContentsAt(0));
  EXPECT_EQ(raw_typed_page_contents, tabstrip()->GetWebContentsAt(1));
  EXPECT_EQ(raw_new_blank_contents, tabstrip()->GetWebContentsAt(2));

  // Now open a couple more blank tabs in the background.
  std::unique_ptr<WebContents> background_blank_contents1 = CreateWebContents();
  WebContents* raw_background_blank_contents1 =
      background_blank_contents1.get();
  tabstrip()->AddWebContents(std::move(background_blank_contents1), -1,
                             ui::PAGE_TRANSITION_TYPED, AddTabTypes::ADD_NONE);
  std::unique_ptr<WebContents> background_blank_contents2 = CreateWebContents();
  WebContents* raw_background_blank_contents2 =
      background_blank_contents2.get();
  tabstrip()->AddWebContents(std::move(background_blank_contents2), -1,
                             ui::PAGE_TRANSITION_GENERATED,
                             AddTabTypes::ADD_NONE);
  EXPECT_EQ(5, tabstrip()->count());
  EXPECT_EQ(raw_homepage_contents, tabstrip()->GetWebContentsAt(0));
  EXPECT_EQ(raw_typed_page_contents, tabstrip()->GetWebContentsAt(1));
  EXPECT_EQ(raw_new_blank_contents, tabstrip()->GetWebContentsAt(2));
  EXPECT_EQ(raw_background_blank_contents1, tabstrip()->GetWebContentsAt(3));
  EXPECT_EQ(raw_background_blank_contents2, tabstrip()->GetWebContentsAt(4));

  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());
}

// Tests whether opener state is correctly forgotten when the user switches
// context.
TEST_F(TabStripModelTest, AddWebContents_ForgetOpeners) {

  // Open the home page.
  std::unique_ptr<WebContents> homepage_contents = CreateWebContents();
  WebContents* raw_homepage_contents = homepage_contents.get();
  tabstrip()->AddWebContents(std::move(homepage_contents), -1,
                             ui::PAGE_TRANSITION_AUTO_BOOKMARK,
                             AddTabTypes::ADD_ACTIVE);

  // Open a blank new tab.
  std::unique_ptr<WebContents> typed_page_contents = CreateWebContents();
  WebContents* raw_typed_page_contents = typed_page_contents.get();
  tabstrip()->AddWebContents(std::move(typed_page_contents), -1,
                             ui::PAGE_TRANSITION_TYPED,
                             AddTabTypes::ADD_ACTIVE);

  EXPECT_EQ(2, tabstrip()->count());

  // Re-select the first tab (home page).
  tabstrip()->ActivateTabAt(
      0, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));

  // Open a bunch of tabs by simulating middle clicking on links on the home
  // page.
  std::unique_ptr<WebContents> middle_click_contents1 = CreateWebContents();
  WebContents* raw_middle_click_contents1 = middle_click_contents1.get();
  tabstrip()->AddWebContents(std::move(middle_click_contents1), -1,
                             ui::PAGE_TRANSITION_LINK, AddTabTypes::ADD_NONE);
  std::unique_ptr<WebContents> middle_click_contents2 = CreateWebContents();
  WebContents* raw_middle_click_contents2 = middle_click_contents2.get();
  tabstrip()->AddWebContents(std::move(middle_click_contents2), -1,
                             ui::PAGE_TRANSITION_LINK, AddTabTypes::ADD_NONE);
  std::unique_ptr<WebContents> middle_click_contents3 = CreateWebContents();
  WebContents* raw_middle_click_contents3 = middle_click_contents3.get();
  tabstrip()->AddWebContents(std::move(middle_click_contents3), -1,
                             ui::PAGE_TRANSITION_LINK, AddTabTypes::ADD_NONE);

  // Break out of the context by selecting a tab in a different context.
  EXPECT_EQ(raw_typed_page_contents, tabstrip()->GetWebContentsAt(4));
  tabstrip()->SelectLastTab();
  EXPECT_EQ(raw_typed_page_contents, tabstrip()->GetActiveWebContents());

  // Step back into the context by selecting a tab inside it.
  tabstrip()->ActivateTabAt(
      2, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));
  EXPECT_EQ(raw_middle_click_contents2, tabstrip()->GetActiveWebContents());

  // Now test that closing tabs selects to the right until there are no more,
  // then to the left, as if there were no context (context has been
  // successfully forgotten).
  tabstrip()->CloseSelectedTabs();
  EXPECT_EQ(raw_middle_click_contents3, tabstrip()->GetActiveWebContents());
  tabstrip()->CloseSelectedTabs();
  EXPECT_EQ(raw_typed_page_contents, tabstrip()->GetActiveWebContents());
  tabstrip()->CloseSelectedTabs();
  EXPECT_EQ(raw_middle_click_contents1, tabstrip()->GetActiveWebContents());
  tabstrip()->CloseSelectedTabs();
  EXPECT_EQ(raw_homepage_contents, tabstrip()->GetActiveWebContents());

  EXPECT_EQ(1, tabstrip()->count());

  tabstrip()->CloseAllTabs();
  EXPECT_TRUE(tabstrip()->empty());
}

// Tests whether or not a WebContents in a new tab belongs in the same tab
// group as its opener.
TEST_F(TabStripModelTest, AddWebContents_LinkOpensInSameGroupAsOpener) {

  // Open the home page and add the tab to a group.
  std::unique_ptr<WebContents> homepage_contents = CreateWebContents();
  tabstrip()->AddWebContents(std::move(homepage_contents), -1,
                             ui::PAGE_TRANSITION_AUTO_BOOKMARK,
                             AddTabTypes::ADD_ACTIVE);
  ASSERT_EQ(1, tabstrip()->count());
  tab_groups::TabGroupId group_id = tabstrip()->AddToNewGroup({0});
  ASSERT_EQ(tabstrip()->GetTabGroupForTab(0), group_id);
  ASSERT_EQ(observer()->group_update(group_id).contents_update_count, 1);

  // Open a tab by simulating a link that opens in a new tab.
  std::unique_ptr<WebContents> contents = CreateWebContents();
  tabstrip()->AddWebContents(std::move(contents), -1, ui::PAGE_TRANSITION_LINK,
                             AddTabTypes::ADD_ACTIVE);
  EXPECT_EQ(2, tabstrip()->count());
  EXPECT_EQ(tabstrip()->GetTabGroupForTab(1), group_id);

  // There should have been a separate notification for the tab being grouped.
  EXPECT_EQ(observer()->group_update(group_id).contents_update_count, 2);

  observer()->ClearStates();
  tabstrip()->CloseAllTabs();
  ASSERT_TRUE(tabstrip()->empty());
}

// Tests that a inserting a new ungrouped tab between two tabs in the same group
// will add that new tab to the group.
TEST_F(TabStripModelTest, AddWebContents_UngroupedTabDoesNotBreakContinuity) {

  // Open two tabs and add them to a tab group.
  std::unique_ptr<WebContents> contents1 = CreateWebContents();
  tabstrip()->AddWebContents(std::move(contents1), -1,
                             ui::PAGE_TRANSITION_AUTO_BOOKMARK,
                             AddTabTypes::ADD_ACTIVE);
  std::unique_ptr<WebContents> contents2 = CreateWebContents();
  tabstrip()->AddWebContents(std::move(contents2), -1,
                             ui::PAGE_TRANSITION_AUTO_BOOKMARK,
                             AddTabTypes::ADD_ACTIVE);
  ASSERT_EQ(2, tabstrip()->count());
  tab_groups::TabGroupId group_id = tabstrip()->AddToNewGroup({0, 1});
  ASSERT_EQ(tabstrip()->GetTabGroupForTab(0), group_id);
  ASSERT_EQ(tabstrip()->GetTabGroupForTab(1), group_id);

  // Open a new tab between the two tabs in a group and ensure the new tab is
  // also in the group.
  std::unique_ptr<WebContents> contents = CreateWebContents();
  WebContents* raw_contents = contents.get();
  tabstrip()->AddWebContents(
      std::move(contents), 1, ui::PAGE_TRANSITION_FIRST,
      AddTabTypes::ADD_ACTIVE | AddTabTypes::ADD_FORCE_INDEX);
  EXPECT_EQ(3, tabstrip()->count());
  ASSERT_EQ(1, tabstrip()->GetIndexOfWebContents(raw_contents));
  EXPECT_EQ(tabstrip()->GetTabGroupForTab(1), group_id);

  tabstrip()->CloseAllTabs();
  ASSERT_TRUE(tabstrip()->empty());
}
// Added for http://b/issue?id=958960
TEST_F(TabStripModelTest, AppendContentsReselectionTest) {

  // Open the Home Page.
  tabstrip()->AddWebContents(CreateWebContents(), -1,
                             ui::PAGE_TRANSITION_AUTO_BOOKMARK,
                             AddTabTypes::ADD_ACTIVE);

  // Open some other tab, by user typing.
  tabstrip()->AddWebContents(CreateWebContents(), -1, ui::PAGE_TRANSITION_TYPED,
                             AddTabTypes::ADD_NONE);

  // The selected tab should still be the first.
  EXPECT_EQ(0, tabstrip()->active_index());

  // Now simulate a link click that opens a new tab (by virtue of target=_blank)
  // and make sure the correct tab gets selected when the new tab is closed.
  tabstrip()->AppendWebContents(CreateWebContents(), true);
  EXPECT_EQ(2, tabstrip()->active_index());
  int previous_tab_count = tabstrip()->count();
  tabstrip()->CloseWebContentsAt(2, TabCloseTypes::CLOSE_NONE);
  EXPECT_EQ(previous_tab_count - 1, tabstrip()->count());
  EXPECT_EQ(0, tabstrip()->active_index());

  // Clean up after ourselves.
  tabstrip()->CloseAllTabs();
}

// Added for http://b/issue?id=1027661
TEST_F(TabStripModelTest, ReselectionConsidersChildrenTest) {

  // Open page A
  std::unique_ptr<WebContents> page_a_contents = CreateWebContents();
  WebContents* raw_page_a_contents = page_a_contents.get();
  tabstrip()->AddWebContents(std::move(page_a_contents), -1,
                             ui::PAGE_TRANSITION_AUTO_BOOKMARK,
                             AddTabTypes::ADD_ACTIVE);

  // Simulate middle click to open page A.A and A.B
  std::unique_ptr<WebContents> page_a_a_contents = CreateWebContents();
  WebContents* raw_page_a_a_contents = page_a_a_contents.get();
  tabstrip()->AddWebContents(std::move(page_a_a_contents), -1,
                             ui::PAGE_TRANSITION_LINK, AddTabTypes::ADD_NONE);
  std::unique_ptr<WebContents> page_a_b_contents = CreateWebContents();
  WebContents* raw_page_a_b_contents = page_a_b_contents.get();
  tabstrip()->AddWebContents(std::move(page_a_b_contents), -1,
                             ui::PAGE_TRANSITION_LINK, AddTabTypes::ADD_NONE);

  // Select page A.A
  tabstrip()->ActivateTabAt(
      1, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));
  EXPECT_EQ(raw_page_a_a_contents, tabstrip()->GetActiveWebContents());

  // Simulate a middle click to open page A.A.A
  std::unique_ptr<WebContents> page_a_a_a_contents = CreateWebContents();
  WebContents* raw_page_a_a_a_contents = page_a_a_a_contents.get();
  tabstrip()->AddWebContents(std::move(page_a_a_a_contents), -1,
                             ui::PAGE_TRANSITION_LINK, AddTabTypes::ADD_NONE);

  EXPECT_EQ(raw_page_a_a_a_contents, tabstrip()->GetWebContentsAt(2));

  // Close page A.A
  tabstrip()->CloseWebContentsAt(tabstrip()->active_index(),
                                 TabCloseTypes::CLOSE_NONE);

  // Page A.A.A should be selected, NOT A.B
  EXPECT_EQ(raw_page_a_a_a_contents, tabstrip()->GetActiveWebContents());

  // Close page A.A.A
  tabstrip()->CloseWebContentsAt(tabstrip()->active_index(),
                                 TabCloseTypes::CLOSE_NONE);

  // Page A.B should be selected
  EXPECT_EQ(raw_page_a_b_contents, tabstrip()->GetActiveWebContents());

  // Close page A.B
  tabstrip()->CloseWebContentsAt(tabstrip()->active_index(),
                                 TabCloseTypes::CLOSE_NONE);

  // Page A should be selected
  EXPECT_EQ(raw_page_a_contents, tabstrip()->GetActiveWebContents());

  // Clean up.
  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, NewTabAtEndOfStripInheritsOpener) {
  // Open page A
  tabstrip()->AddWebContents(CreateWebContents(), -1,
                             ui::PAGE_TRANSITION_AUTO_TOPLEVEL,
                             AddTabTypes::ADD_ACTIVE);

  // Open pages B, C and D in the background from links on page A...
  for (int i = 0; i < 3; ++i) {
    tabstrip()->AddWebContents(CreateWebContents(), -1,
                               ui::PAGE_TRANSITION_LINK, AddTabTypes::ADD_NONE);
  }

  // Switch to page B's tab.
  tabstrip()->ActivateTabAt(
      1, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));

  // Open a New Tab at the end of the strip (simulate Ctrl+T)
  std::unique_ptr<WebContents> new_contents = CreateWebContents();
  WebContents* raw_new_contents = new_contents.get();
  tabstrip()->AddWebContents(std::move(new_contents), -1,
                             ui::PAGE_TRANSITION_TYPED,
                             AddTabTypes::ADD_ACTIVE);

  EXPECT_EQ(4, tabstrip()->GetIndexOfWebContents(raw_new_contents));
  EXPECT_EQ(4, tabstrip()->active_index());

  // Close the New Tab that was just opened. We should be returned to page B's
  // Tab...
  tabstrip()->CloseWebContentsAt(4, TabCloseTypes::CLOSE_NONE);

  EXPECT_EQ(1, tabstrip()->active_index());

  // Open a non-New Tab tab at the end of the strip, with a TYPED transition.
  // This is like typing a URL in the address bar and pressing Alt+Enter. The
  // behavior should be the same as above.
  std::unique_ptr<WebContents> page_e_contents = CreateWebContents();
  WebContents* raw_page_e_contents = page_e_contents.get();
  tabstrip()->AddWebContents(std::move(page_e_contents), -1,
                             ui::PAGE_TRANSITION_TYPED,
                             AddTabTypes::ADD_ACTIVE);

  EXPECT_EQ(4, tabstrip()->GetIndexOfWebContents(raw_page_e_contents));
  EXPECT_EQ(4, tabstrip()->active_index());

  // Close the Tab. Selection should shift back to page B's Tab.
  tabstrip()->CloseWebContentsAt(4, TabCloseTypes::CLOSE_NONE);

  EXPECT_EQ(1, tabstrip()->active_index());

  // Open a non-New Tab tab at the end of the strip, with some other
  // transition. This is like right clicking on a bookmark and choosing "Open
  // in New Tab". No opener relationship should be preserved between this Tab
  // and the one that was active when the gesture was performed.
  std::unique_ptr<WebContents> page_f_contents = CreateWebContents();
  WebContents* raw_page_f_contents = page_f_contents.get();
  tabstrip()->AddWebContents(std::move(page_f_contents), -1,
                             ui::PAGE_TRANSITION_AUTO_BOOKMARK,
                             AddTabTypes::ADD_ACTIVE);

  EXPECT_EQ(4, tabstrip()->GetIndexOfWebContents(raw_page_f_contents));
  EXPECT_EQ(4, tabstrip()->active_index());

  // Close the Tab. The next-adjacent should be selected.
  tabstrip()->CloseWebContentsAt(4, TabCloseTypes::CLOSE_NONE);

  EXPECT_EQ(3, tabstrip()->active_index());

  // Clean up.
  tabstrip()->CloseAllTabs();
}

// A test of navigations in a tab that is part of a tree of openers from some
// parent tab. If the navigations are link clicks, the opener relationships of
// the tab. If they are of any other type, they are not preserved.
TEST_F(TabStripModelTest, NavigationForgetsOpeners) {

  // Open page A
  tabstrip()->AddWebContents(CreateWebContents(), -1,
                             ui::PAGE_TRANSITION_AUTO_TOPLEVEL,
                             AddTabTypes::ADD_ACTIVE);

  // Open pages B, C and D in the background from links on page A...
  std::unique_ptr<WebContents> page_c_contents = CreateWebContents();
  WebContents* raw_page_c_contents = page_c_contents.get();
  std::unique_ptr<WebContents> page_d_contents = CreateWebContents();
  WebContents* raw_page_d_contents = page_d_contents.get();
  tabstrip()->AddWebContents(CreateWebContents(), -1, ui::PAGE_TRANSITION_LINK,
                             AddTabTypes::ADD_NONE);
  tabstrip()->AddWebContents(std::move(page_c_contents), -1,
                             ui::PAGE_TRANSITION_LINK, AddTabTypes::ADD_NONE);
  tabstrip()->AddWebContents(std::move(page_d_contents), -1,
                             ui::PAGE_TRANSITION_LINK, AddTabTypes::ADD_NONE);

  // Open page E in a different opener tree from page A.
  std::unique_ptr<WebContents> page_e_contents = CreateWebContents();
  WebContents* raw_page_e_contents = page_e_contents.get();
  tabstrip()->AddWebContents(std::move(page_e_contents), -1,
                             ui::PAGE_TRANSITION_AUTO_TOPLEVEL,
                             AddTabTypes::ADD_NONE);

  // Tell the TabStripModel that we are navigating page D via a link click.
  tabstrip()->ActivateTabAt(
      3, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));
  tabstrip()->TabNavigating(raw_page_d_contents, ui::PAGE_TRANSITION_LINK);

  // Close page D, page C should be selected. (part of same opener tree).
  tabstrip()->CloseWebContentsAt(3, TabCloseTypes::CLOSE_NONE);
  EXPECT_EQ(2, tabstrip()->active_index());

  // Tell the TabStripModel that we are navigating in page C via a bookmark.
  tabstrip()->TabNavigating(raw_page_c_contents,
                            ui::PAGE_TRANSITION_AUTO_BOOKMARK);

  // Close page C, page E should be selected. (C is no longer part of the
  // A-B-C-D tree, selection moves to the right).
  tabstrip()->CloseWebContentsAt(2, TabCloseTypes::CLOSE_NONE);
  EXPECT_EQ(raw_page_e_contents,
            tabstrip()->GetWebContentsAt(tabstrip()->active_index()));

  tabstrip()->CloseAllTabs();
}

// A test for the "quick look" use case where the user can open a new tab at the
// end of the tab strip, do one search, and then close the tab to get back to
// where they were.
TEST_F(TabStripModelTest, NavigationForgettingDoesntAffectNewTab) {

  // Open a tab and several tabs from it, then select one of the tabs that was
  // opened.
  tabstrip()->AddWebContents(CreateWebContents(), -1,
                             ui::PAGE_TRANSITION_AUTO_TOPLEVEL,
                             AddTabTypes::ADD_ACTIVE);

  std::unique_ptr<WebContents> page_c_contents = CreateWebContents();
  WebContents* raw_page_c_contents = page_c_contents.get();
  std::unique_ptr<WebContents> page_d_contents = CreateWebContents();
  WebContents* raw_page_d_contents = page_d_contents.get();
  tabstrip()->AddWebContents(CreateWebContents(), -1, ui::PAGE_TRANSITION_LINK,
                             AddTabTypes::ADD_NONE);
  tabstrip()->AddWebContents(std::move(page_c_contents), -1,
                             ui::PAGE_TRANSITION_LINK, AddTabTypes::ADD_NONE);
  tabstrip()->AddWebContents(std::move(page_d_contents), -1,
                             ui::PAGE_TRANSITION_LINK, AddTabTypes::ADD_NONE);

  tabstrip()->ActivateTabAt(
      2, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));

  // TEST 1: A tab in the middle of a bunch of tabs is active and the user opens
  // a new tab at the end of the tabstrip()-> Closing that new tab will select
  // the tab that they were last on.

  // Open a new tab at the end of the TabStrip.
  std::unique_ptr<WebContents> new_tab_contents = CreateWebContents();
  WebContents* raw_new_tab_contents = new_tab_contents.get();
  content::WebContentsTester::For(raw_new_tab_contents)
      ->NavigateAndCommit(GURL("chrome://newtab"));
  tabstrip()->AddWebContents(std::move(new_tab_contents), -1,
                             ui::PAGE_TRANSITION_TYPED,
                             AddTabTypes::ADD_ACTIVE);

  // The opener should still be remembered after one navigation.
  content::NavigationSimulator::CreateBrowserInitiated(
      GURL("http://example.com"), raw_new_tab_contents)
      ->Start();
  tabstrip()->TabNavigating(raw_new_tab_contents, ui::PAGE_TRANSITION_TYPED);

  // At this point, if we close this tab the last selected one should be
  // re-selected.
  tabstrip()->CloseWebContentsAt(tabstrip()->count() - 1,
                                 TabCloseTypes::CLOSE_NONE);
  EXPECT_EQ(raw_page_c_contents,
            tabstrip()->GetWebContentsAt(tabstrip()->active_index()));

  // TEST 2: As above, but the user selects another tab in the strip and thus
  // that new tab's opener relationship is forgotten.

  // Open a new tab again.
  tabstrip()->AddWebContents(CreateWebContents(), -1, ui::PAGE_TRANSITION_TYPED,
                             AddTabTypes::ADD_ACTIVE);

  // Now select the first tab.
  tabstrip()->ActivateTabAt(
      0, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));

  // Now select the last tab.
  tabstrip()->ActivateTabAt(
      tabstrip()->count() - 1,
      TabStripUserGestureDetails(
          TabStripUserGestureDetails::GestureType::kOther));

  // Now close the last tab. The next adjacent should be selected.
  tabstrip()->CloseWebContentsAt(tabstrip()->count() - 1,
                                 TabCloseTypes::CLOSE_NONE);
  EXPECT_EQ(raw_page_d_contents,
            tabstrip()->GetWebContentsAt(tabstrip()->active_index()));

  // TEST 3: As above, but the user does multiple navigations and thus the tab's
  // opener relationship is forgotten.
  tabstrip()->ActivateTabAt(
      2, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));

  // Open a new tab but navigate away from the new tab page.
  new_tab_contents = CreateWebContents();
  raw_new_tab_contents = new_tab_contents.get();
  tabstrip()->AddWebContents(std::move(new_tab_contents), -1,
                             ui::PAGE_TRANSITION_TYPED,
                             AddTabTypes::ADD_ACTIVE);
  content::WebContentsTester::For(raw_new_tab_contents)
      ->NavigateAndCommit(GURL("http://example.org"));

  // Do another navigation. The opener should be forgotten.
  content::NavigationSimulator::CreateBrowserInitiated(
      GURL("http://example.com"), raw_new_tab_contents)
      ->Start();
  tabstrip()->TabNavigating(raw_new_tab_contents, ui::PAGE_TRANSITION_TYPED);

  // Close the tab. The next adjacent should be selected.
  tabstrip()->CloseWebContentsAt(tabstrip()->count() - 1,
                                 TabCloseTypes::CLOSE_NONE);
  EXPECT_EQ(raw_page_d_contents,
            tabstrip()->GetWebContentsAt(tabstrip()->active_index()));

  tabstrip()->CloseAllTabs();
}

namespace {

class UnloadListenerTabStripModelDelegate : public TestTabStripModelDelegate {
 public:
  UnloadListenerTabStripModelDelegate() = default;
  UnloadListenerTabStripModelDelegate(
      const UnloadListenerTabStripModelDelegate&) = delete;
  UnloadListenerTabStripModelDelegate& operator=(
      const UnloadListenerTabStripModelDelegate&) = delete;
  ~UnloadListenerTabStripModelDelegate() override = default;

  void set_run_unload_listener(bool value) { run_unload_ = value; }

  bool RunUnloadListenerBeforeClosing(WebContents* contents) override {
    return run_unload_;
  }

 private:
  // Whether to report that we need to run an unload listener before closing.
  bool run_unload_ = false;
};

}  // namespace

// Tests that fast shutdown is attempted appropriately.
TEST_F(TabStripModelTest, FastShutdown) {
  UnloadListenerTabStripModelDelegate delegate;
  TabStripModel tabstrip(&delegate, profile());
  MockTabStripModelObserver observer;
  tabstrip.AddObserver(&observer);

  EXPECT_TRUE(tabstrip.empty());

  // Make sure fast shutdown is attempted when tabs that share a RPH are shut
  // down.
  {
    std::unique_ptr<WebContents> contents1 = CreateWebContents();
    WebContents* raw_contents1 = contents1.get();
    std::unique_ptr<WebContents> contents2 =
        CreateWebContentsWithSharedRPH(contents1.get());

    SetID(contents1.get(), 1);
    SetID(contents2.get(), 2);

    tabstrip.AppendWebContents(std::move(contents1), true);
    tabstrip.AppendWebContents(std::move(contents2), true);

    // Turn on the fake unload listener so the tabs don't actually get shut
    // down when we call CloseAllTabs()---we need to be able to check that
    // fast shutdown was attempted.
    delegate.set_run_unload_listener(true);
    tabstrip.CloseAllTabs();
    // On a mock RPH this checks whether we *attempted* fast shutdown.
    // A real RPH would reject our attempt since there is an unload handler.
    EXPECT_TRUE(raw_contents1->GetPrimaryMainFrame()
                    ->GetProcess()
                    ->FastShutdownStarted());
    EXPECT_EQ(2, tabstrip.count());

    delegate.set_run_unload_listener(false);
    observer.ClearStates();
    tabstrip.CloseAllTabs();
    EXPECT_TRUE(tabstrip.empty());
  }

  // Make sure fast shutdown is not attempted when only some tabs that share a
  // RPH are shut down.
  {
    std::unique_ptr<WebContents> contents1 = CreateWebContents();
    WebContents* raw_contents1 = contents1.get();
    std::unique_ptr<WebContents> contents2 =
        CreateWebContentsWithSharedRPH(contents1.get());

    SetID(contents1.get(), 1);
    SetID(contents2.get(), 2);

    tabstrip.AppendWebContents(std::move(contents1), true);
    tabstrip.AppendWebContents(std::move(contents2), true);

    tabstrip.CloseWebContentsAt(1, TabCloseTypes::CLOSE_NONE);
    EXPECT_FALSE(raw_contents1->GetPrimaryMainFrame()
                     ->GetProcess()
                     ->FastShutdownStarted());
    EXPECT_EQ(1, tabstrip.count());

    tabstrip.CloseAllTabs();
    EXPECT_TRUE(tabstrip.empty());
  }
}

// Tests various permutations of pinning tabs.
TEST_F(TabStripModelTest, Pinning) {
  typedef MockTabStripModelObserver::State State;

  std::unique_ptr<WebContents> contents1 = CreateWebContentsWithID(1);
  WebContents* raw_contents1 = contents1.get();
  std::unique_ptr<WebContents> contents3 = CreateWebContentsWithID(3);
  WebContents* raw_contents3 = contents3.get();

  // Note! The ordering of these tests is important, each subsequent test
  // builds on the state established in the previous. This is important if you
  // ever insert tests rather than append.

  // Initial state, three tabs, first selected.
  tabstrip()->AppendWebContents(std::move(contents1), true);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(2), false);
  tabstrip()->AppendWebContents(std::move(contents3), false);

  observer()->ClearStates();

  // Pin the first tab, this shouldn't visually reorder anything.
  {
    EXPECT_EQ(0, tabstrip()->SetTabPinned(0, true));

    // As the order didn't change, we should get a pinned notification.
    ASSERT_EQ(1, observer()->GetStateCount());
    State state(raw_contents1, 0, MockTabStripModelObserver::PINNED);
    observer()->ExpectStateEquals(0, state);

    // And verify the state.
    EXPECT_EQ("1p 2 3", GetTabStripStateString(tabstrip()));

    observer()->ClearStates();
  }

  // Unpin the first tab.
  {
    EXPECT_EQ(0, tabstrip()->SetTabPinned(0, false));

    // As the order didn't change, we should get a pinned notification.
    ASSERT_EQ(1, observer()->GetStateCount());
    State state(raw_contents1, 0, MockTabStripModelObserver::PINNED);
    observer()->ExpectStateEquals(0, state);

    // And verify the state.
    EXPECT_EQ("1 2 3", GetTabStripStateString(tabstrip()));

    observer()->ClearStates();
  }

  // Pin the 3rd tab, which should move it to the front.
  {
    EXPECT_EQ(0, tabstrip()->SetTabPinned(2, true));

    // The pinning should have resulted in a move and a pinned notification.
    ASSERT_EQ(3, observer()->GetStateCount());
    State state(raw_contents3, 0, MockTabStripModelObserver::MOVE);
    state.src_index = 2;
    observer()->ExpectStateEquals(0, state);

    state = State(raw_contents3, 0, MockTabStripModelObserver::PINNED);
    observer()->ExpectStateEquals(2, state);

    // And verify the state.
    EXPECT_EQ("3p 1 2", GetTabStripStateString(tabstrip()));

    observer()->ClearStates();
  }

  // Pin the tab "1", which shouldn't move anything.
  {
    EXPECT_EQ(1, tabstrip()->SetTabPinned(1, true));

    // As the order didn't change, we should get a pinned notification.
    ASSERT_EQ(1, observer()->GetStateCount());
    State state(raw_contents1, 1, MockTabStripModelObserver::PINNED);
    observer()->ExpectStateEquals(0, state);

    // And verify the state.
    EXPECT_EQ("3p 1p 2", GetTabStripStateString(tabstrip()));

    observer()->ClearStates();
  }

  // Try to move tab "2" to the front, it should be ignored.
  {
    EXPECT_EQ(2, tabstrip()->MoveWebContentsAt(2, 0, false));

    // As the order didn't change, we should get a pinned notification.
    ASSERT_EQ(0, observer()->GetStateCount());

    // And verify the state.
    EXPECT_EQ("3p 1p 2", GetTabStripStateString(tabstrip()));

    observer()->ClearStates();
  }

  // Unpin tab "3", which implicitly moves it to the end.
  {
    EXPECT_EQ(1, tabstrip()->SetTabPinned(0, false));

    ASSERT_EQ(3, observer()->GetStateCount());
    State state(raw_contents3, 1, MockTabStripModelObserver::MOVE);
    state.src_index = 0;
    observer()->ExpectStateEquals(0, state);

    state = State(raw_contents3, 1, MockTabStripModelObserver::PINNED);
    observer()->ExpectStateEquals(2, state);

    // And verify the state.
    EXPECT_EQ("1p 3 2", GetTabStripStateString(tabstrip()));

    observer()->ClearStates();
  }

  // Unpin tab "3", nothing should happen.
  {
    EXPECT_EQ(1, tabstrip()->SetTabPinned(1, false));

    ASSERT_EQ(0, observer()->GetStateCount());

    EXPECT_EQ("1p 3 2", GetTabStripStateString(tabstrip()));

    observer()->ClearStates();
  }

  // Pin "3" and "1".
  {
    EXPECT_EQ(0, tabstrip()->SetTabPinned(0, true));
    EXPECT_EQ(1, tabstrip()->SetTabPinned(1, true));

    EXPECT_EQ("1p 3p 2", GetTabStripStateString(tabstrip()));

    observer()->ClearStates();
  }

  std::unique_ptr<WebContents> contents4 = CreateWebContentsWithID(4);
  WebContents* raw_contents4 = contents4.get();

  // Insert "4" between "1" and "3". As "1" and "4" are pinned, "4" should end
  // up after them.
  {
    EXPECT_EQ(2, tabstrip()->InsertWebContentsAt(1, std::move(contents4),
                                                 AddTabTypes::ADD_NONE));

    ASSERT_EQ(1, observer()->GetStateCount());
    State state(raw_contents4, 2, MockTabStripModelObserver::INSERT);
    observer()->ExpectStateEquals(0, state);

    EXPECT_EQ("1p 3p 4 2", GetTabStripStateString(tabstrip()));
  }

  observer()->ClearStates();
  tabstrip()->CloseAllTabs();
}

// Makes sure the TabStripModel calls the right observer methods during a
// replace.
TEST_F(TabStripModelTest, ReplaceSendsSelected) {
  typedef MockTabStripModelObserver::State State;

  std::unique_ptr<WebContents> first_contents = CreateWebContents();
  WebContents* raw_first_contents = first_contents.get();
  tabstrip()->AddWebContents(std::move(first_contents), -1,
                             ui::PAGE_TRANSITION_TYPED,
                             AddTabTypes::ADD_ACTIVE);
  observer()->ClearStates();

  std::unique_ptr<WebContents> new_contents = CreateWebContents();
  WebContents* raw_new_contents = new_contents.get();
  tabstrip()->DiscardWebContentsAt(0, std::move(new_contents));

  ASSERT_EQ(2, observer()->GetStateCount());

  // First event should be for replaced.
  State state(raw_new_contents, 0, MockTabStripModelObserver::REPLACED);
  state.src_contents = raw_first_contents;
  observer()->ExpectStateEquals(0, state);

  // And the second for selected.
  state = State(raw_new_contents, 0, MockTabStripModelObserver::ACTIVATE);
  state.src_contents = raw_first_contents;
  state.change_reason = TabStripModelObserver::CHANGE_REASON_REPLACED;
  observer()->ExpectStateEquals(1, state);

  // Now add another tab and replace it, making sure we don't get a selected
  // event this time.
  std::unique_ptr<WebContents> third_contents = CreateWebContents();
  WebContents* raw_third_contents = third_contents.get();
  tabstrip()->AddWebContents(std::move(third_contents), 1,
                             ui::PAGE_TRANSITION_TYPED, AddTabTypes::ADD_NONE);

  observer()->ClearStates();

  // And replace it.
  new_contents = CreateWebContents();
  raw_new_contents = new_contents.get();
  tabstrip()->DiscardWebContentsAt(1, std::move(new_contents));

  ASSERT_EQ(1, observer()->GetStateCount());

  state = State(raw_new_contents, 1, MockTabStripModelObserver::REPLACED);
  state.src_contents = raw_third_contents;
  observer()->ExpectStateEquals(0, state);

  observer()->ClearStates();
  tabstrip()->CloseAllTabs();
}

// Ensure pinned tabs are not mixed with non-pinned tabs when using
// MoveWebContentsAt.
TEST_F(TabStripModelTest, MoveWebContentsAtWithPinned) {
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 6, 3, {0}));
  EXPECT_EQ("0p 1p 2p 3 4 5", GetTabStripStateString(tabstrip()));

  // Move middle tabs into the wrong area.
  tabstrip()->MoveWebContentsAt(1, 5, true);
  EXPECT_EQ("0p 2p 1p 3 4 5", GetTabStripStateString(tabstrip()));
  tabstrip()->MoveWebContentsAt(4, 1, true);
  EXPECT_EQ("0p 2p 1p 4 3 5", GetTabStripStateString(tabstrip()));

  // Test moving edge cases into the wrong area.
  tabstrip()->MoveWebContentsAt(5, 0, true);
  EXPECT_EQ("0p 2p 1p 5 4 3", GetTabStripStateString(tabstrip()));
  tabstrip()->MoveWebContentsAt(0, 5, true);
  EXPECT_EQ("2p 1p 0p 5 4 3", GetTabStripStateString(tabstrip()));

  // Test moving edge cases in the correct area.
  tabstrip()->MoveWebContentsAt(3, 5, true);
  EXPECT_EQ("2p 1p 0p 4 3 5", GetTabStripStateString(tabstrip()));
  tabstrip()->MoveWebContentsAt(2, 0, true);
  EXPECT_EQ("0p 2p 1p 4 3 5", GetTabStripStateString(tabstrip()));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, MoveTabNext) {
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 6, 3, {3}));
  EXPECT_EQ("0p 1p 2p 3 4 5", GetTabStripStateString(tabstrip()));

  tabstrip()->MoveTabNext();
  EXPECT_EQ("0p 1p 2p 4 3 5", GetTabStripStateString(tabstrip()));

  tabstrip()->MoveTabNext();
  EXPECT_EQ("0p 1p 2p 4 5 3", GetTabStripStateString(tabstrip()));

  tabstrip()->MoveTabNext();
  EXPECT_EQ("0p 1p 2p 4 5 3", GetTabStripStateString(tabstrip()));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, MoveTabNext_Pinned) {
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 6, 3, {0}));
  EXPECT_EQ("0p 1p 2p 3 4 5", GetTabStripStateString(tabstrip()));

  tabstrip()->MoveTabNext();
  EXPECT_EQ("1p 0p 2p 3 4 5", GetTabStripStateString(tabstrip()));

  tabstrip()->MoveTabNext();
  EXPECT_EQ("1p 2p 0p 3 4 5", GetTabStripStateString(tabstrip()));

  tabstrip()->MoveTabNext();
  EXPECT_EQ("1p 2p 0p 3 4 5", GetTabStripStateString(tabstrip()));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, MoveTabNext_Group) {
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 4, 0, {0}));
  EXPECT_EQ("0 1 2 3", GetTabStripStateString(tabstrip()));

  tab_groups::TabGroupId group = tabstrip()->AddToNewGroup({1, 2});
  EXPECT_EQ(tabstrip()->GetTabGroupForTab(0), std::nullopt);

  tabstrip()->MoveTabNext();
  EXPECT_EQ("0 1 2 3", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(tabstrip()->GetTabGroupForTab(0), group);

  tabstrip()->MoveTabNext();
  EXPECT_EQ("1 0 2 3", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(tabstrip()->GetTabGroupForTab(1), group);

  tabstrip()->MoveTabNext();
  EXPECT_EQ("1 2 0 3", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(tabstrip()->GetTabGroupForTab(2), group);

  tabstrip()->MoveTabNext();
  EXPECT_EQ("1 2 0 3", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(tabstrip()->GetTabGroupForTab(2), std::nullopt);

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, MoveTabNext_GroupAtEnd) {
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 2, 0, {0}));
  EXPECT_EQ("0 1", GetTabStripStateString(tabstrip()));

  tab_groups::TabGroupId group = tabstrip()->AddToNewGroup({0, 1});

  tabstrip()->MoveTabNext();
  EXPECT_EQ("1 0", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(tabstrip()->GetTabGroupForTab(1), group);

  tabstrip()->MoveTabNext();
  EXPECT_EQ("1 0", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(tabstrip()->GetTabGroupForTab(1), std::nullopt);

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, MoveTabNext_PinnedDoesNotGroup) {
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 4, 1, {0}));
  EXPECT_EQ("0p 1 2 3", GetTabStripStateString(tabstrip()));

  tabstrip()->AddToNewGroup({1, 2});
  EXPECT_EQ(tabstrip()->GetTabGroupForTab(0), std::nullopt);

  tabstrip()->MoveTabNext();
  EXPECT_EQ("0p 1 2 3", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(tabstrip()->GetTabGroupForTab(0), std::nullopt);

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, MoveTabNext_Split) {
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 5, 0, {1}));
  tabstrip()->AddToNewSplit({2}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);
  tabstrip()->ActivateTabAt(3);
  tabstrip()->AddToNewSplit({4}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);
  tabstrip()->AddToNewGroup({3, 4});
  ASSERT_EQ("0 1s 2s 3g0s 4g0s", GetTabStripStateString(tabstrip(), true));

  tabstrip()->ActivateTabAt(0);
  tabstrip()->MoveTabNext();
  EXPECT_EQ("1s 2s 0 3g0s 4g0s", GetTabStripStateString(tabstrip(), true));

  tabstrip()->MoveTabNext();
  EXPECT_EQ("1s 2s 0g0 3g0s 4g0s", GetTabStripStateString(tabstrip(), true));

  tabstrip()->MoveTabNext();
  EXPECT_EQ("1s 2s 3g0s 4g0s 0g0", GetTabStripStateString(tabstrip(), true));

  tabstrip()->MoveTabNext();
  EXPECT_EQ("1s 2s 3g0s 4g0s 0", GetTabStripStateString(tabstrip(), true));

  tabstrip()->MoveTabNext();
  EXPECT_EQ("1s 2s 3g0s 4g0s 0", GetTabStripStateString(tabstrip(), true));

  tabstrip()->ActivateTabAt(0);
  tabstrip()->MoveTabNext();
  EXPECT_EQ("1g0s 2g0s 3g0s 4g0s 0", GetTabStripStateString(tabstrip(), true));

  tabstrip()->MoveTabNext();
  EXPECT_EQ("3g0s 4g0s 1g0s 2g0s 0", GetTabStripStateString(tabstrip(), true));

  tabstrip()->MoveTabNext();
  EXPECT_EQ("3g0s 4g0s 1s 2s 0", GetTabStripStateString(tabstrip(), true));

  tabstrip()->MoveTabNext();
  EXPECT_EQ("3g0s 4g0s 0 1s 2s", GetTabStripStateString(tabstrip(), true));

  tabstrip()->MoveTabNext();
  EXPECT_EQ("3g0s 4g0s 0 1s 2s", GetTabStripStateString(tabstrip(), true));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, MoveTabNext_SplitPinned) {
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 3, 3, {0}));
  tabstrip()->ActivateTabAt(1);
  tabstrip()->AddToNewSplit({2}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);
  ASSERT_EQ("0p 1ps 2ps", GetTabStripStateString(tabstrip(), true));

  tabstrip()->ActivateTabAt(0);
  tabstrip()->MoveTabNext();
  EXPECT_EQ("1ps 2ps 0p", GetTabStripStateString(tabstrip(), true));

  tabstrip()->MoveTabNext();
  EXPECT_EQ("1ps 2ps 0p", GetTabStripStateString(tabstrip(), true));

  tabstrip()->ActivateTabAt(0);
  tabstrip()->MoveTabNext();
  EXPECT_EQ("0p 1ps 2ps", GetTabStripStateString(tabstrip(), true));

  tabstrip()->MoveTabNext();
  EXPECT_EQ("0p 1ps 2ps", GetTabStripStateString(tabstrip(), true));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, MoveTabPrevious) {
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 6, 3, {5}));
  EXPECT_EQ("0p 1p 2p 3 4 5", GetTabStripStateString(tabstrip()));

  tabstrip()->MoveTabPrevious();
  EXPECT_EQ("0p 1p 2p 3 5 4", GetTabStripStateString(tabstrip()));

  tabstrip()->MoveTabPrevious();
  EXPECT_EQ("0p 1p 2p 5 3 4", GetTabStripStateString(tabstrip()));

  tabstrip()->MoveTabPrevious();
  EXPECT_EQ("0p 1p 2p 5 3 4", GetTabStripStateString(tabstrip()));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, MoveTabPrevious_Pinned) {
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 6, 3, {2}));
  EXPECT_EQ("0p 1p 2p 3 4 5", GetTabStripStateString(tabstrip()));

  tabstrip()->MoveTabPrevious();
  EXPECT_EQ("0p 2p 1p 3 4 5", GetTabStripStateString(tabstrip()));

  tabstrip()->MoveTabPrevious();
  EXPECT_EQ("2p 0p 1p 3 4 5", GetTabStripStateString(tabstrip()));

  tabstrip()->MoveTabPrevious();
  EXPECT_EQ("2p 0p 1p 3 4 5", GetTabStripStateString(tabstrip()));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, MoveTabPrevious_Group) {
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 4, 0, {3}));
  EXPECT_EQ("0 1 2 3", GetTabStripStateString(tabstrip()));

  tab_groups::TabGroupId group = tabstrip()->AddToNewGroup({1, 2});
  EXPECT_EQ(tabstrip()->GetTabGroupForTab(3), std::nullopt);

  tabstrip()->MoveTabPrevious();
  EXPECT_EQ("0 1 2 3", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(tabstrip()->GetTabGroupForTab(3), group);

  tabstrip()->MoveTabPrevious();
  EXPECT_EQ("0 1 3 2", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(tabstrip()->GetTabGroupForTab(2), group);

  tabstrip()->MoveTabPrevious();
  EXPECT_EQ("0 3 1 2", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(tabstrip()->GetTabGroupForTab(1), group);

  tabstrip()->MoveTabPrevious();
  EXPECT_EQ("0 3 1 2", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(tabstrip()->GetTabGroupForTab(1), std::nullopt);

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, MoveTabPrevious_GroupAtEnd) {
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 2, 0, {1}));
  EXPECT_EQ("0 1", GetTabStripStateString(tabstrip()));

  tab_groups::TabGroupId group = tabstrip()->AddToNewGroup({0, 1});

  tabstrip()->MoveTabPrevious();
  EXPECT_EQ("1 0", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(tabstrip()->GetTabGroupForTab(0), group);

  tabstrip()->MoveTabPrevious();
  EXPECT_EQ("1 0", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(tabstrip()->GetTabGroupForTab(0), std::nullopt);

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, MoveTabPrevious_Split) {
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 5, 0, {0}));
  tabstrip()->AddToNewSplit({1}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);
  tabstrip()->AddToNewGroup({0, 1});
  tabstrip()->ActivateTabAt(2);
  tabstrip()->AddToNewSplit({3}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);
  ASSERT_EQ("0g0s 1g0s 2s 3s 4", GetTabStripStateString(tabstrip(), true));

  tabstrip()->ActivateTabAt(4);
  tabstrip()->MoveTabPrevious();
  EXPECT_EQ("0g0s 1g0s 4 2s 3s", GetTabStripStateString(tabstrip(), true));

  tabstrip()->MoveTabPrevious();
  EXPECT_EQ("0g0s 1g0s 4g0 2s 3s", GetTabStripStateString(tabstrip(), true));

  tabstrip()->MoveTabPrevious();
  EXPECT_EQ("4g0 0g0s 1g0s 2s 3s", GetTabStripStateString(tabstrip(), true));

  tabstrip()->MoveTabPrevious();
  EXPECT_EQ("4 0g0s 1g0s 2s 3s", GetTabStripStateString(tabstrip(), true));

  tabstrip()->MoveTabPrevious();
  EXPECT_EQ("4 0g0s 1g0s 2s 3s", GetTabStripStateString(tabstrip(), true));

  tabstrip()->ActivateTabAt(4);
  tabstrip()->MoveTabPrevious();
  EXPECT_EQ("4 0g0s 1g0s 2g0s 3g0s", GetTabStripStateString(tabstrip(), true));

  tabstrip()->MoveTabPrevious();
  EXPECT_EQ("4 2g0s 3g0s 0g0s 1g0s", GetTabStripStateString(tabstrip(), true));

  tabstrip()->MoveTabPrevious();
  EXPECT_EQ("4 2s 3s 0g0s 1g0s", GetTabStripStateString(tabstrip(), true));

  tabstrip()->MoveTabPrevious();
  EXPECT_EQ("2s 3s 4 0g0s 1g0s", GetTabStripStateString(tabstrip(), true));

  tabstrip()->MoveTabPrevious();
  EXPECT_EQ("2s 3s 4 0g0s 1g0s", GetTabStripStateString(tabstrip(), true));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, MoveTabPrevious_SplitPinned) {
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 3, 3, {0}));
  tabstrip()->AddToNewSplit({1}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);
  ASSERT_EQ("0ps 1ps 2p", GetTabStripStateString(tabstrip(), true));

  tabstrip()->ActivateTabAt(2);
  tabstrip()->MoveTabPrevious();
  EXPECT_EQ("2p 0ps 1ps", GetTabStripStateString(tabstrip(), true));

  tabstrip()->MoveTabPrevious();
  EXPECT_EQ("2p 0ps 1ps", GetTabStripStateString(tabstrip(), true));

  tabstrip()->ActivateTabAt(2);
  tabstrip()->MoveTabPrevious();
  EXPECT_EQ("0ps 1ps 2p", GetTabStripStateString(tabstrip(), true));

  tabstrip()->MoveTabPrevious();
  EXPECT_EQ("0ps 1ps 2p", GetTabStripStateString(tabstrip(), true));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, MoveSelectedTabsTo) {
  struct TestData {
    // Number of tabs the tab strip should have.
    const int tab_count;

    // Number of pinned tabs.
    const int pinned_count;

    // Index of the tabs to select.
    const std::vector<int> selected_tabs;

    // Index to move the tabs to.
    const int target_index;

    // Expected state after the move (space separated list of indices).
    const std::string state_after_move;
  };
  auto test_data = std::to_array<TestData>({
      // 1 selected tab.
      {2, 0, {0}, 1, "1 0"},
      {3, 0, {0}, 2, "1 2 0"},
      {3, 0, {2}, 0, "2 0 1"},
      {3, 0, {2}, 1, "0 2 1"},
      {3, 0, {0, 1}, 0, "0 1 2"},

      // 2 selected tabs.
      {6, 0, {4, 5}, 1, "0 4 5 1 2 3"},
      {3, 0, {0, 1}, 1, "2 0 1"},
      {4, 0, {0, 2}, 1, "1 0 2 3"},
      {6, 0, {0, 1}, 3, "2 3 4 0 1 5"},

      // 3 selected tabs.
      {6, 0, {0, 2, 3}, 3, "1 4 5 0 2 3"},
      {7, 0, {4, 5, 6}, 1, "0 4 5 6 1 2 3"},
      {7, 0, {1, 5, 6}, 4, "0 2 3 4 1 5 6"},

      // 5 selected tabs.
      {8, 0, {0, 2, 3, 6, 7}, 3, "1 4 5 0 2 3 6 7"},

      // 7 selected tabs
      {16,
       0,
       {0, 1, 2, 3, 4, 7, 9},
       8,
       "5 6 8 10 11 12 13 14 0 1 2 3 4 7 9 15"},

      // With pinned tabs.
      {6, 2, {2, 3}, 2, "0p 1p 2 3 4 5"},
      {6, 2, {0, 4}, 3, "1p 0p 2 3 4 5"},
      {6, 3, {1, 2, 4}, 0, "1p 2p 0p 4 3 5"},
      {8, 3, {1, 3, 4}, 4, "0p 2p 1p 5 6 3 4 7"},

      {7, 4, {2, 3, 4}, 3, "0p 1p 2p 3p 5 4 6"},
  });

  for (size_t i = 0; i < std::size(test_data); ++i) {
    ASSERT_NO_FATAL_FAILURE(PrepareTabstripForSelectionTest(
        tabstrip(), test_data[i].tab_count, test_data[i].pinned_count,
        test_data[i].selected_tabs));
    tabstrip()->MoveSelectedTabsTo(test_data[i].target_index, std::nullopt);
    EXPECT_EQ(test_data[i].state_after_move, GetTabStripStateString(tabstrip()))
        << i;
    tabstrip()->CloseAllTabs();
  }
}

TEST_F(TabStripModelTest, MoveSelectedTabsToWithEntireGroupSelected) {
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 10, 5, {2, 3, 6, 7}));

  tab_groups::TabGroupId group_id = tabstrip()->AddToNewGroup({6, 7});
  tabstrip()->SelectTabAt(6);
  tabstrip()->SelectTabAt(7);
  tabstrip()->SelectTabAt(9);

  tabstrip()->MoveSelectedTabsTo(3, std::nullopt);
  EXPECT_EQ("0p 1p 4p 2p 3p 6 7 9 5 8", GetTabStripStateString(tabstrip()));
  EXPECT_TRUE(tabstrip()->group_model()->ContainsTabGroup(group_id));
  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, MoveSelectedTabsToWithPartGroupSelected) {
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 10, 5, {2, 3}));

  tab_groups::TabGroupId group_id = tabstrip()->AddToNewGroup({6, 7});
  tabstrip()->SelectTabAt(6);

  tabstrip()->MoveSelectedTabsTo(3, std::nullopt);
  EXPECT_EQ("0p 1p 4p 2p 3p 6 5 7 8 9", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(
      tabstrip()->group_model()->GetTabGroup(group_id)->ListTabs().length(),
      1u);
}

TEST_F(TabStripModelTest, MoveSelectedTabsToWithSplit) {
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 10, 5, {2, 3, 6, 7}));

  tabstrip()->ActivateTabAt(
      6, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));

  tabstrip()->AddToNewSplit({7}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);

  PrepareTabstripForSelectionTest(tabstrip(), 0, 0, {6, 7});

  tabstrip()->MoveSelectedTabsTo(3, std::nullopt);
  EXPECT_EQ("0p 1p 2p 3p 4p 6s 7s 5 8 9", GetTabStripStateString(tabstrip()));
}

TEST_F(TabStripModelTest, MoveSelectedTabsToWithGroupAndSplit) {
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 13, 5, {2, 3}));

  tab_groups::TabGroupId group_id_one = tabstrip()->AddToNewGroup({6, 7, 8});
  tab_groups::TabGroupId group_id_two = tabstrip()->AddToNewGroup({10});

  // Create splits in group, ungrouped and pinned states.
  tabstrip()->ActivateTabAt(
      1, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));
  tabstrip()->AddToNewSplit({0}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);

  tabstrip()->ActivateTabAt(
      6, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));
  tabstrip()->AddToNewSplit({7}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);

  tabstrip()->ActivateTabAt(
      11, TabStripUserGestureDetails(
              TabStripUserGestureDetails::GestureType::kOther));
  tabstrip()->AddToNewSplit({12}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);

  // Move all the split tabs along with some other tabs.
  PrepareTabstripForSelectionTest(tabstrip(), 0, 0,
                                  {0, 1, 6, 7, 8, 10, 11, 12});

  tabstrip()->MoveSelectedTabsTo(3, std::nullopt);
  EXPECT_EQ("2p 3p 4p 0ps 1ps 6s 7s 8 10 11s 12s 5 9",
            GetTabStripStateString(tabstrip()));
  EXPECT_TRUE(tabstrip()->group_model()->ContainsTabGroup(group_id_one));
  EXPECT_TRUE(tabstrip()->group_model()->ContainsTabGroup(group_id_two));
}

// Tests that moving a tab forgets all openers referencing it.
TEST_F(TabStripModelTest, MoveSelectedTabsTo_ForgetOpeners) {

  // Open page A as a new tab and then A1 in the background from A.
  std::unique_ptr<WebContents> page_a_contents = CreateWebContents();
  WebContents* raw_page_a_contents = page_a_contents.get();
  tabstrip()->AddWebContents(std::move(page_a_contents), -1,
                             ui::PAGE_TRANSITION_AUTO_TOPLEVEL,
                             AddTabTypes::ADD_ACTIVE);
  std::unique_ptr<WebContents> page_a1_contents = CreateWebContents();
  WebContents* raw_page_a1_contents = page_a1_contents.get();
  tabstrip()->AddWebContents(std::move(page_a1_contents), -1,
                             ui::PAGE_TRANSITION_LINK, AddTabTypes::ADD_NONE);

  // Likewise, open pages B and B1.
  std::unique_ptr<WebContents> page_b_contents = CreateWebContents();
  WebContents* raw_page_b_contents = page_b_contents.get();
  tabstrip()->AddWebContents(std::move(page_b_contents), -1,
                             ui::PAGE_TRANSITION_AUTO_TOPLEVEL,
                             AddTabTypes::ADD_ACTIVE);
  std::unique_ptr<WebContents> page_b1_contents = CreateWebContents();
  WebContents* raw_page_b1_contents = page_b1_contents.get();
  tabstrip()->AddWebContents(std::move(page_b1_contents), -1,
                             ui::PAGE_TRANSITION_LINK, AddTabTypes::ADD_NONE);

  EXPECT_EQ(raw_page_a_contents, tabstrip()->GetWebContentsAt(0));
  EXPECT_EQ(raw_page_a1_contents, tabstrip()->GetWebContentsAt(1));
  EXPECT_EQ(raw_page_b_contents, tabstrip()->GetWebContentsAt(2));
  EXPECT_EQ(raw_page_b1_contents, tabstrip()->GetWebContentsAt(3));

  // Move page B to the start of the tab tabstrip()->
  tabstrip()->MoveSelectedTabsTo(0, std::nullopt);

  // Open page B2 in the background from B. It should end up after B.
  std::unique_ptr<WebContents> page_b2_contents = CreateWebContents();
  WebContents* raw_page_b2_contents = page_b2_contents.get();
  tabstrip()->AddWebContents(std::move(page_b2_contents), -1,
                             ui::PAGE_TRANSITION_LINK, AddTabTypes::ADD_NONE);
  EXPECT_EQ(raw_page_b_contents, tabstrip()->GetWebContentsAt(0));
  EXPECT_EQ(raw_page_b2_contents, tabstrip()->GetWebContentsAt(1));
  EXPECT_EQ(raw_page_a_contents, tabstrip()->GetWebContentsAt(2));
  EXPECT_EQ(raw_page_a1_contents, tabstrip()->GetWebContentsAt(3));
  EXPECT_EQ(raw_page_b1_contents, tabstrip()->GetWebContentsAt(4));

  // Switch to A.
  tabstrip()->ActivateTabAt(
      2, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));
  EXPECT_EQ(raw_page_a_contents, tabstrip()->GetActiveWebContents());

  // Open page A2 in the background from A. It should end up after A1.
  std::unique_ptr<WebContents> page_a2_contents = CreateWebContents();
  WebContents* raw_page_a2_contents = page_a2_contents.get();
  tabstrip()->AddWebContents(std::move(page_a2_contents), -1,
                             ui::PAGE_TRANSITION_LINK, AddTabTypes::ADD_NONE);
  EXPECT_EQ(raw_page_b_contents, tabstrip()->GetWebContentsAt(0));
  EXPECT_EQ(raw_page_b2_contents, tabstrip()->GetWebContentsAt(1));
  EXPECT_EQ(raw_page_a_contents, tabstrip()->GetWebContentsAt(2));
  EXPECT_EQ(raw_page_a1_contents, tabstrip()->GetWebContentsAt(3));
  EXPECT_EQ(raw_page_a2_contents, tabstrip()->GetWebContentsAt(4));
  EXPECT_EQ(raw_page_b1_contents, tabstrip()->GetWebContentsAt(5));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, CloseSelectedTabs) {
  for (int i = 0; i < 3; ++i) {
    tabstrip()->AppendWebContents(CreateWebContents(), true);
  }
  tabstrip()->SelectTabAt(1);
  tabstrip()->CloseSelectedTabs();
  EXPECT_EQ(1, tabstrip()->count());
  EXPECT_EQ(0, tabstrip()->active_index());
  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, FirstTabIsActive) {
  // Add the first tab as a background tab.
  tabstrip()->AppendWebContents(CreateWebContents(), /*foreground=*/false);

  // The tab is still added as active, because it is the first tab.
  EXPECT_EQ(0, tabstrip()->active_index());
}

TEST_F(TabStripModelTest, MultipleSelection) {
  typedef MockTabStripModelObserver::State State;

  std::unique_ptr<WebContents> contents0 = CreateWebContents();
  WebContents* raw_contents0 = contents0.get();
  std::unique_ptr<WebContents> contents3 = CreateWebContents();
  WebContents* raw_contents3 = contents3.get();
  tabstrip()->AppendWebContents(std::move(contents0), false);
  tabstrip()->AppendWebContents(CreateWebContents(), false);
  tabstrip()->AppendWebContents(CreateWebContents(), false);
  tabstrip()->AppendWebContents(std::move(contents3), false);
  observer()->ClearStates();

  // Selection and active tab change.
  tabstrip()->ActivateTabAt(
      3, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));
  ASSERT_EQ(3, observer()->GetStateCount());
  ASSERT_EQ(observer()->GetStateAt(0).action,
            MockTabStripModelObserver::DEACTIVATE);
  ASSERT_EQ(observer()->GetStateAt(1).action,
            MockTabStripModelObserver::ACTIVATE);
  State s1(raw_contents3, 3, MockTabStripModelObserver::SELECT);
  s1.src_index = 0;
  observer()->ExpectStateEquals(2, s1);
  observer()->ClearStates();

  // Adding all tabs to selection, active tab is now at 0.
  tabstrip()->ExtendSelectionTo(0);
  ASSERT_EQ(3, observer()->GetStateCount());
  ASSERT_EQ(observer()->GetStateAt(0).action,
            MockTabStripModelObserver::DEACTIVATE);
  ASSERT_EQ(observer()->GetStateAt(1).action,
            MockTabStripModelObserver::ACTIVATE);
  State s2(raw_contents0, 0, MockTabStripModelObserver::SELECT);
  s2.src_index = 3;
  observer()->ExpectStateEquals(2, s2);
  observer()->ClearStates();

  // Toggle the active tab, should make the next index active.
  tabstrip()->DeselectTabAt(0);
  EXPECT_EQ(1, tabstrip()->active_index());
  EXPECT_EQ(3U, tabstrip()->selection_model().size());
  EXPECT_EQ(4, tabstrip()->count());
  ASSERT_EQ(3, observer()->GetStateCount());
  ASSERT_EQ(observer()->GetStateAt(0).action,
            MockTabStripModelObserver::DEACTIVATE);
  ASSERT_EQ(observer()->GetStateAt(1).action,
            MockTabStripModelObserver::ACTIVATE);
  ASSERT_EQ(observer()->GetStateAt(2).action,
            MockTabStripModelObserver::SELECT);
  observer()->ClearStates();

  // Toggle the first tab back to selected and active.
  tabstrip()->SelectTabAt(0);
  EXPECT_EQ(0, tabstrip()->active_index());
  EXPECT_EQ(4U, tabstrip()->selection_model().size());
  EXPECT_EQ(4, tabstrip()->count());
  ASSERT_EQ(3, observer()->GetStateCount());
  ASSERT_EQ(observer()->GetStateAt(0).action,
            MockTabStripModelObserver::DEACTIVATE);
  ASSERT_EQ(observer()->GetStateAt(1).action,
            MockTabStripModelObserver::ACTIVATE);
  ASSERT_EQ(observer()->GetStateAt(2).action,
            MockTabStripModelObserver::SELECT);
  observer()->ClearStates();

  // Closing one of the selected tabs, not the active one.
  tabstrip()->CloseWebContentsAt(1, TabCloseTypes::CLOSE_NONE);
  EXPECT_EQ(3, tabstrip()->count());
  ASSERT_EQ(3, observer()->GetStateCount());
  ASSERT_EQ(observer()->GetStateAt(0).action, MockTabStripModelObserver::CLOSE);
  ASSERT_EQ(observer()->GetStateAt(1).action,
            MockTabStripModelObserver::DETACH);
  ASSERT_EQ(observer()->GetStateAt(2).action,
            MockTabStripModelObserver::SELECT);
  observer()->ClearStates();

  // Closing the active tab, while there are others tabs selected.
  tabstrip()->CloseWebContentsAt(0, TabCloseTypes::CLOSE_NONE);
  EXPECT_EQ(2, tabstrip()->count());
  ASSERT_EQ(5, observer()->GetStateCount());
  ASSERT_EQ(observer()->GetStateAt(0).action, MockTabStripModelObserver::CLOSE);
  ASSERT_EQ(observer()->GetStateAt(1).action,
            MockTabStripModelObserver::DETACH);
  ASSERT_EQ(observer()->GetStateAt(2).action,
            MockTabStripModelObserver::DEACTIVATE);
  ASSERT_EQ(observer()->GetStateAt(3).action,
            MockTabStripModelObserver::ACTIVATE);
  ASSERT_EQ(observer()->GetStateAt(4).action,
            MockTabStripModelObserver::SELECT);
  observer()->ClearStates();

  // Active tab is at 0, deselecting all but the active tab.
  tabstrip()->DeselectTabAt(1);
  ASSERT_EQ(1, observer()->GetStateCount());
  ASSERT_EQ(observer()->GetStateAt(0).action,
            MockTabStripModelObserver::SELECT);
  observer()->ClearStates();

  // Attempting to deselect the only selected and therefore active tab,
  // it is ignored (no notifications being sent) and tab at 0 remains selected
  // and active.
  tabstrip()->DeselectTabAt(0);
  ASSERT_EQ(0, observer()->GetStateCount());

  tabstrip()->RemoveObserver(observer());
  observer()->ClearStates();
  tabstrip()->CloseAllTabs();
}

// Verifies that if we change the selection from a multi selection to a single
// selection, but not in a way that changes the selected_index that
// TabSelectionChanged is invoked.
TEST_F(TabStripModelTest, MultipleToSingle) {
  typedef MockTabStripModelObserver::State State;

  std::unique_ptr<WebContents> contents2 = CreateWebContents();
  WebContents* raw_contents2 = contents2.get();
  tabstrip()->AppendWebContents(CreateWebContents(), false);
  tabstrip()->AppendWebContents(std::move(contents2), false);
  tabstrip()->SelectTabAt(0);
  tabstrip()->SelectTabAt(1);
  observer()->ClearStates();

  // This changes the selection (0 is no longer selected) but the selected_index
  // still remains at 1.
  tabstrip()->ActivateTabAt(
      1, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));
  ASSERT_EQ(1, observer()->GetStateCount());
  State s(raw_contents2, 1, MockTabStripModelObserver::SELECT);
  s.src_index = 1;
  s.change_reason = TabStripModelObserver::CHANGE_REASON_NONE;
  observer()->ExpectStateEquals(0, s);
  tabstrip()->RemoveObserver(observer());
  observer()->ClearStates();
  tabstrip()->CloseAllTabs();
}

namespace {

// Test Browser-like class for TabStripModelTest.TabBlockedState.
class TabBlockedStateTestBrowser
    : public TabStripModelObserver,
      public web_modal::WebContentsModalDialogManagerDelegate {
 public:
  explicit TabBlockedStateTestBrowser(TabStripModel* tab_strip_model)
      : tab_strip_model_(tab_strip_model) {
    tab_strip_model_->AddObserver(this);
  }
  TabBlockedStateTestBrowser(const TabBlockedStateTestBrowser&) = delete;
  TabBlockedStateTestBrowser& operator=(const TabBlockedStateTestBrowser&) =
      delete;
  ~TabBlockedStateTestBrowser() override {
    tab_strip_model_->RemoveObserver(this);
  }

 private:
  // TabStripModelObserver
  void OnTabStripModelChanged(
      TabStripModel* tab_strip_model,
      const TabStripModelChange& change,
      const TabStripSelectionChange& selection) override {
    if (change.type() != TabStripModelChange::kInserted) {
      return;
    }

    for (const auto& contents : change.GetInsert()->contents) {
      web_modal::WebContentsModalDialogManager* manager =
          web_modal::WebContentsModalDialogManager::FromWebContents(
              contents.contents);
      if (manager) {
        manager->SetDelegate(this);
      }
    }
  }

  // WebContentsModalDialogManagerDelegate
  void SetWebContentsBlocked(content::WebContents* contents,
                             bool blocked) override {
    int index = tab_strip_model_->GetIndexOfWebContents(contents);

    // Removal of tabs from the TabStripModel can cause observer callbacks to
    // invoke this method. The WebContents may no longer exist in the
    // TabStripModel.
    if (index == TabStripModel::kNoTab) {
      return;
    }

    tab_strip_model_->SetTabBlocked(index, blocked);
  }

  raw_ptr<TabStripModel> tab_strip_model_;
};

class DummySingleWebContentsDialogManager
    : public web_modal::SingleWebContentsDialogManager {
 public:
  explicit DummySingleWebContentsDialogManager(
      gfx::NativeWindow dialog,
      web_modal::SingleWebContentsDialogManagerDelegate* delegate)
      : delegate_(delegate), dialog_(dialog) {}
  DummySingleWebContentsDialogManager(
      const DummySingleWebContentsDialogManager&) = delete;
  DummySingleWebContentsDialogManager& operator=(
      const DummySingleWebContentsDialogManager&) = delete;
  ~DummySingleWebContentsDialogManager() override = default;

  void Show() override {}
  void Hide() override {}
  void Close() override { delegate_->WillClose(dialog_); }
  void Focus() override {}
  void Pulse() override {}
  void HostChanged(web_modal::WebContentsModalDialogHost* new_host) override {}
  gfx::NativeWindow dialog() override { return dialog_; }
  bool IsActive() const override { return true; }

 private:
  raw_ptr<web_modal::SingleWebContentsDialogManagerDelegate> delegate_;
  gfx::NativeWindow dialog_;
};

}  // namespace

// Verifies a newly inserted tab retains its previous blocked state.
// http://crbug.com/276334
TEST_F(TabStripModelTest, TabBlockedState) {
  // Start with a source tab tabstrip()->
  TestTabStripModelDelegate dummy_tab_strip_delegate;
  TabStripModel strip_src(&dummy_tab_strip_delegate, profile());
  TabBlockedStateTestBrowser browser_src(&strip_src);

  // Add a tab.
  std::unique_ptr<WebContents> contents1 = CreateWebContents();
  web_modal::WebContentsModalDialogManager::CreateForWebContents(
      contents1.get());
  strip_src.AppendWebContents(std::move(contents1), /*foreground=*/true);

  // Add another tab.
  std::unique_ptr<WebContents> contents2 = CreateWebContents();
  WebContents* raw_contents2 = contents2.get();
  web_modal::WebContentsModalDialogManager::CreateForWebContents(
      contents2.get());
  strip_src.AppendWebContents(std::move(contents2), false);

  // Create a destination tab tabstrip()->
  TabStripModel strip_dst(&dummy_tab_strip_delegate, profile());
  TabBlockedStateTestBrowser browser_dst(&strip_dst);

  // Setup a SingleWebContentsDialogManager for tab |contents2|.
  web_modal::WebContentsModalDialogManager* modal_dialog_manager =
      web_modal::WebContentsModalDialogManager::FromWebContents(raw_contents2);

  // Show a dialog that blocks tab |contents2|.
  // DummySingleWebContentsDialogManager doesn't care about the
  // dialog window value, so any dummy value works.
  DummySingleWebContentsDialogManager* native_manager =
      new DummySingleWebContentsDialogManager(gfx::NativeWindow(),
                                              modal_dialog_manager);
  modal_dialog_manager->ShowDialogWithManager(
      gfx::NativeWindow(),
      std::unique_ptr<web_modal::SingleWebContentsDialogManager>(
          native_manager));
  EXPECT_TRUE(strip_src.IsTabBlocked(1));

  // Detach the tab.
  std::unique_ptr<tabs::TabModel> moved_tab =
      strip_src.DetachTabAtForInsertion(1);
  EXPECT_EQ(raw_contents2, moved_tab->GetContents());

  // Attach the tab to the destination tab tabstrip()->
  strip_dst.AppendTab(std::move(moved_tab), true);
  EXPECT_TRUE(strip_dst.IsTabBlocked(0));

  strip_dst.CloseAllTabs();
  strip_src.CloseAllTabs();
}

// Verifies ordering of tabs opened via a link from a pinned tab with a
// subsequent pinned tab.
TEST_F(TabStripModelTest, LinkClicksWithPinnedTabOrdering) {

  // Open two pages, pinned.
  tabstrip()->AddWebContents(CreateWebContents(), -1,
                             ui::PAGE_TRANSITION_AUTO_TOPLEVEL,
                             AddTabTypes::ADD_ACTIVE | AddTabTypes::ADD_PINNED);
  tabstrip()->AddWebContents(CreateWebContents(), -1,
                             ui::PAGE_TRANSITION_AUTO_TOPLEVEL,
                             AddTabTypes::ADD_ACTIVE | AddTabTypes::ADD_PINNED);

  // Activate the first tab (a).
  tabstrip()->ActivateTabAt(
      0, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));

  // Open two more tabs as link clicks. The first tab, c, should appear after
  // the pinned tabs followed by the second tab (d).
  std::unique_ptr<WebContents> page_c_contents = CreateWebContents();
  WebContents* raw_page_c_contents = page_c_contents.get();
  std::unique_ptr<WebContents> page_d_contents = CreateWebContents();
  WebContents* raw_page_d_contents = page_d_contents.get();
  tabstrip()->AddWebContents(std::move(page_c_contents), -1,
                             ui::PAGE_TRANSITION_LINK, AddTabTypes::ADD_NONE);
  tabstrip()->AddWebContents(std::move(page_d_contents), -1,
                             ui::PAGE_TRANSITION_LINK, AddTabTypes::ADD_NONE);

  EXPECT_EQ(2, tabstrip()->GetIndexOfWebContents(raw_page_c_contents));
  EXPECT_EQ(3, tabstrip()->GetIndexOfWebContents(raw_page_d_contents));
  tabstrip()->CloseAllTabs();
}

// This test covers a bug in TabStripModel::MoveWebContentsAt(). Specifically
// if |select_after_move| was true it checked if the index
// select_after_move (as an int) was selected rather than |to_position|.
TEST_F(TabStripModelTest, MoveWebContentsAt) {
  tabstrip()->AppendWebContents(CreateWebContents(), false);
  tabstrip()->AppendWebContents(CreateWebContents(), false);
  tabstrip()->AppendWebContents(CreateWebContents(), false);
  tabstrip()->AppendWebContents(CreateWebContents(), false);

  tabstrip()->ActivateTabAt(
      1, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));
  EXPECT_EQ(1, tabstrip()->active_index());

  tabstrip()->MoveWebContentsAt(2, 3, true);
  EXPECT_EQ(3, tabstrip()->active_index());

  observer()->ClearStates();
  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, NewTabsUngrouped) {
  tabstrip()->AppendWebContents(CreateWebContents(), false);

  EXPECT_FALSE(tabstrip()->GetTabGroupForTab(0).has_value());

  tabstrip()->ActivateTabAt(
      0, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));
  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, AddTabToNewGroup) {
  ASSERT_TRUE(tabstrip()->SupportsTabGroups());

  tabstrip()->AppendWebContents(CreateWebContents(), false);

  tabstrip()->AddToNewGroup({0});

  EXPECT_TRUE(tabstrip()->GetTabGroupForTab(0).has_value());

  tabstrip()->ActivateTabAt(
      0, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));
  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, FindGroupIdFor) {
  ASSERT_TRUE(tabstrip()->SupportsTabGroups());

  {
    auto result = tabstrip()->FindGroupIdFor(tabs::TabCollection::Handle(888));
    ASSERT_FALSE(result.has_value());
  }

  {
    tabstrip()->AppendWebContents(CreateWebContents(), false);
    auto* tab = tabstrip()->GetTabAtIndex(0);

    ASSERT_TRUE(tab != nullptr);

    auto group_id = tabstrip()->AddToNewGroup({0});

    auto* collection = tab->GetParentCollection();
    ASSERT_TRUE(collection != nullptr);

    auto result = tabstrip()->FindGroupIdFor(collection->GetHandle());
    ASSERT_TRUE(result.has_value());
    ASSERT_EQ(group_id, result.value());
  }
}

TEST_F(TabStripModelTest, AddTabToNewGroupUpdatesObservers) {
  ASSERT_TRUE(tabstrip()->SupportsTabGroups());

  tabstrip()->AppendWebContents(CreateWebContents(), true);

  observer()->ClearStates();
  tab_groups::TabGroupId group = tabstrip()->AddToNewGroup({0});
  EXPECT_EQ(1u, observer()->group_updates().size());
  EXPECT_EQ(1, observer()->group_update(group).contents_update_count);

  observer()->ClearStates();
  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, ReplacingTabGroupUpdatesObservers) {
  ASSERT_TRUE(tabstrip()->SupportsTabGroups());

  tabstrip()->AppendWebContents(CreateWebContents(), true);
  tabstrip()->AppendWebContents(CreateWebContents(), true);

  observer()->ClearStates();
  tab_groups::TabGroupId first_group = tabstrip()->AddToNewGroup({0, 1});
  tab_groups::TabGroupId second_group = tabstrip()->AddToNewGroup({0});
  EXPECT_EQ(2u, observer()->group_updates().size());
  EXPECT_EQ(3, observer()->group_update(first_group).contents_update_count);
  EXPECT_EQ(1, observer()->group_update(second_group).contents_update_count);

  observer()->ClearStates();
  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, AddTabToNewGroupMiddleOfExistingGroup) {
  ASSERT_TRUE(tabstrip()->SupportsTabGroups());

  PrepareTabs(tabstrip(), 4);
  tabstrip()->AddToNewGroup({0, 1, 2, 3});

  tabstrip()->AddToNewGroup({1, 2});
  EXPECT_EQ("0g0 3g0 1g1 2g1", GetTabStripStateString(tabstrip(), true));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, AddTabToNewGroupMiddleOfExistingGroupTwoGroups) {
  PrepareTabs(tabstrip(), 4);
  tabstrip()->AddToNewGroup({0, 1, 2});
  tabstrip()->AddToNewGroup({3});

  tabstrip()->AddToNewGroup({1});
  EXPECT_EQ("0g0 2g0 1g1 3g2", GetTabStripStateString(tabstrip(), true));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, AddTabToNewGroupReorders) {
  PrepareTabs(tabstrip(), 3);

  tabstrip()->AddToNewGroup({0, 2});

  EXPECT_EQ("0g0 2g0 1", GetTabStripStateString(tabstrip(), true));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, AddTabToNewGroupUnpins) {
  PrepareTabs(tabstrip(), 2);

  tabstrip()->SetTabPinned(0, true);
  tabstrip()->AddToNewGroup({0, 1});

  EXPECT_EQ("0g0 1g0", GetTabStripStateString(tabstrip(), true));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, AddTabToNewGroupUnpinsAndReorders) {
  PrepareTabs(tabstrip(), 3);

  tabstrip()->SetTabPinned(0, true);
  tabstrip()->SetTabPinned(1, true);
  tabstrip()->AddToNewGroup({0});

  EXPECT_EQ("1p 0g0 2", GetTabStripStateString(tabstrip(), true));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, AddTabToNewGroupMovesPinnedAndUnpinnedTabs) {
  PrepareTabs(tabstrip(), 4);

  tabstrip()->SetTabPinned(0, true);
  tabstrip()->SetTabPinned(1, true);
  tabstrip()->SetTabPinned(2, true);
  tabstrip()->AddToNewGroup({0, 1});
  EXPECT_EQ("2p 0g0 1g0 3", GetTabStripStateString(tabstrip(), true));

  tabstrip()->AddToNewGroup({0, 2});
  EXPECT_EQ("2g0 1g0 0g1 3", GetTabStripStateString(tabstrip(), true));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, AddTabAndSplitsToNewGroup) {
  PrepareTabs(tabstrip(), 8);

  tabstrip()->SetTabPinned(0, true);
  tabstrip()->SetTabPinned(1, true);
  tabstrip()->SetTabPinned(2, true);
  tabstrip()->ActivateTabAt(1);
  tabstrip()->AddToNewSplit({2}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);
  tabstrip()->SetTabPinned(3, true);
  tabstrip()->ActivateTabAt(5);
  tabstrip()->AddToNewSplit({6}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);
  ASSERT_EQ("0p 1ps 2ps 3p 4 5s 6s 7",
            GetTabStripStateString(tabstrip(), true));

  tabstrip()->AddToNewGroup({0, 1, 2, 5, 6, 7});
  EXPECT_EQ("3p 0g0 1g0s 2g0s 5g0s 6g0s 7g0 4",
            GetTabStripStateString(tabstrip(), true));

  tabstrip()->AddToNewGroup({0, 2, 3, 6});
  EXPECT_EQ("3g0 1g0s 2g0s 7g0 0g1 5g1s 6g1s 4",
            GetTabStripStateString(tabstrip(), true));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, AddTabToExistingGroupIdempotent) {
  tabstrip()->AppendWebContents(CreateWebContents(), true);

  tabstrip()->AddToNewGroup({0});
  std::optional<tab_groups::TabGroupId> group =
      tabstrip()->GetTabGroupForTab(0);
  tabstrip()->AddToExistingGroup({0}, group.value());

  observer()->ClearStates();
  EXPECT_EQ(tabstrip()->GetTabGroupForTab(0), group);
  EXPECT_EQ(0, observer()->GetStateCount());

  observer()->ClearStates();
  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, AddTabToExistingGroup) {
  PrepareTabs(tabstrip(), 2);

  tabstrip()->AddToNewGroup({0});
  std::optional<tab_groups::TabGroupId> group =
      tabstrip()->GetTabGroupForTab(0);

  tabstrip()->AddToExistingGroup({1}, group.value());
  EXPECT_EQ("0g0 1g0", GetTabStripStateString(tabstrip(), true));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, AddTabToExistingGroupUpdatesObservers) {
  PrepareTabs(tabstrip(), 2);

  tab_groups::TabGroupId group = tabstrip()->AddToNewGroup({0});
  EXPECT_EQ(1u, observer()->group_updates().size());
  EXPECT_EQ(1, observer()->group_update(group).contents_update_count);
  observer()->ClearStates();
  ASSERT_EQ(0u, observer()->group_updates().size());

  tabstrip()->AddToExistingGroup({1}, group);
  EXPECT_EQ(1u, observer()->group_updates().size());
  EXPECT_EQ(1, observer()->group_update(group).contents_update_count);

  observer()->ClearStates();
  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, AddTabToLeftOfExistingGroupReorders) {
  PrepareTabs(tabstrip(), 3);

  tabstrip()->AddToNewGroup({2});
  std::optional<tab_groups::TabGroupId> group =
      tabstrip()->GetTabGroupForTab(2);

  tabstrip()->AddToExistingGroup({0}, group.value());
  EXPECT_EQ("1 0g0 2g0", GetTabStripStateString(tabstrip(), true));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, AddTabToRighOfExistingGroupReorders) {
  PrepareTabs(tabstrip(), 3);

  tabstrip()->AddToNewGroup({0});
  std::optional<tab_groups::TabGroupId> group =
      tabstrip()->GetTabGroupForTab(0);

  tabstrip()->AddToExistingGroup({2}, group.value());
  EXPECT_EQ("0g0 2g0 1", GetTabStripStateString(tabstrip(), true));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, AddTabToExistingGroupReorders) {
  PrepareTabs(tabstrip(), 4);

  tabstrip()->AddToNewGroup({1});
  std::optional<tab_groups::TabGroupId> group =
      tabstrip()->GetTabGroupForTab(1);

  tabstrip()->AddToExistingGroup({0, 3}, group.value());
  EXPECT_EQ(tabstrip()->GetTabGroupForTab(0), group);
  EXPECT_EQ(tabstrip()->GetTabGroupForTab(1), group);
  EXPECT_EQ(tabstrip()->GetTabGroupForTab(2), group);
  EXPECT_FALSE(tabstrip()->GetTabGroupForTab(3).has_value());
  EXPECT_EQ("0 1 3 2", GetTabStripStateString(tabstrip()));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, AddTabToExistingGroupUnpins) {
  PrepareTabs(tabstrip(), 2);

  tabstrip()->SetTabPinned(0, true);
  tabstrip()->AddToNewGroup({1});
  std::optional<tab_groups::TabGroupId> group =
      tabstrip()->GetTabGroupForTab(1);

  tabstrip()->AddToExistingGroup({0}, group.value());
  EXPECT_FALSE(tabstrip()->IsTabPinned(0));
  EXPECT_EQ(tabstrip()->GetTabGroupForTab(0), group);
  EXPECT_EQ("0 1", GetTabStripStateString(tabstrip()));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, AddTabAndSplitsToExistingGroup) {
  PrepareTabs(tabstrip(), 8);

  tabstrip()->SetTabPinned(0, true);
  tabstrip()->SetTabPinned(1, true);
  tabstrip()->SetTabPinned(2, true);
  tabstrip()->ActivateTabAt(1);
  tabstrip()->AddToNewSplit({2}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);
  tabstrip()->SetTabPinned(3, true);
  tabstrip()->ActivateTabAt(5);
  tabstrip()->AddToNewSplit({6}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);
  tabstrip()->AddToNewGroup({4});
  ASSERT_EQ("0p 1ps 2ps 3p 4g0 5s 6s 7",
            GetTabStripStateString(tabstrip(), true));
  std::optional<tab_groups::TabGroupId> group =
      tabstrip()->GetTabGroupForTab(4);

  tabstrip()->AddToExistingGroup({0, 1, 2, 5, 6, 7}, group.value());
  EXPECT_EQ("3p 0g0 1g0s 2g0s 4g0 5g0s 6g0s 7g0",
            GetTabStripStateString(tabstrip(), true));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, PinTabInGroupUngroups) {
  PrepareTabs(tabstrip(), 2);

  tabstrip()->AddToNewGroup({0, 1});
  EXPECT_EQ(0, tabstrip()->SetTabPinned(1, true));

  EXPECT_FALSE(tabstrip()->GetTabGroupForTab(0).has_value());
  EXPECT_TRUE(tabstrip()->GetTabGroupForTab(1).has_value());
  EXPECT_EQ("1p 0", GetTabStripStateString(tabstrip()));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, RemoveTabFromGroupNoopForUngroupedTab) {
  tabstrip()->AppendWebContents(CreateWebContents(), true);

  observer()->ClearStates();
  tabstrip()->RemoveFromGroup({0});
  EXPECT_EQ(0, observer()->GetStateCount());

  observer()->ClearStates();
  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, RemoveTabFromGroup) {
  tabstrip()->AppendWebContents(CreateWebContents(), true);
  tabstrip()->AddToNewGroup({0});

  tabstrip()->RemoveFromGroup({0});

  EXPECT_FALSE(tabstrip()->GetTabGroupForTab(0).has_value());

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, RemoveTabFromGroupUpdatesObservers) {
  tabstrip()->AppendWebContents(CreateWebContents(), true);
  tabstrip()->AppendWebContents(CreateWebContents(), false);
  observer()->ClearStates();

  tab_groups::TabGroupId group = tabstrip()->AddToNewGroup({0});
  EXPECT_EQ(1u, observer()->group_updates().size());
  EXPECT_EQ(1, observer()->group_update(group).contents_update_count);

  tabstrip()->RemoveFromGroup({0});
  EXPECT_EQ(0u, observer()->group_updates().size());

  observer()->ClearStates();
  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, RemoveTabFromGroupMaintainsOrder) {
  PrepareTabs(tabstrip(), 2);
  tabstrip()->AddToNewGroup({0, 1});

  tabstrip()->RemoveFromGroup({0});
  EXPECT_EQ("0 1g0", GetTabStripStateString(tabstrip(), true));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, RemoveTabFromGroupDoesntReorderIfNoGroup) {
  PrepareTabs(tabstrip(), 3);
  tabstrip()->AddToNewGroup({0});

  tabstrip()->RemoveFromGroup({0, 1});
  EXPECT_EQ("0 1 2", GetTabStripStateString(tabstrip()));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest,
       RemoveTabFromGroupMaintainsRelativeOrderOfSelectedTabs) {
  PrepareTabs(tabstrip(), 4);
  tabstrip()->AddToNewGroup({0, 1, 2, 3});

  tabstrip()->RemoveFromGroup({0, 2});
  EXPECT_EQ("0 1g0 3g0 2", GetTabStripStateString(tabstrip(), true));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, RemoveTabFromGroupMixtureOfGroups) {
  PrepareTabs(tabstrip(), 5);
  tabstrip()->AddToNewGroup({0, 1});
  tabstrip()->AddToNewGroup({2, 3});

  tabstrip()->RemoveFromGroup({0, 3, 4});
  EXPECT_EQ("0 1g0 2g1 3 4", GetTabStripStateString(tabstrip(), true));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, RemoveTabFromGroupDeletesGroup) {
  tabstrip()->AppendWebContents(CreateWebContents(), true);
  tabstrip()->AddToNewGroup({0});
  EXPECT_EQ(tabstrip()->group_model()->ListTabGroups().size(), 1U);

  tabstrip()->RemoveFromGroup({0});

  EXPECT_EQ(tabstrip()->group_model()->ListTabGroups().size(), 0U);

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, RemoveTabsAndSplitsFromGroup) {
  PrepareTabs(tabstrip(), 5);
  tabstrip()->ActivateTabAt(1);
  tabstrip()->AddToNewSplit({2}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);
  tabstrip()->AddToNewGroup({0, 1, 2, 3, 4});
  ASSERT_EQ("0g0 1g0s 2g0s 3g0 4g0", GetTabStripStateString(tabstrip(), true));

  tabstrip()->RemoveFromGroup({1, 2, 3});
  EXPECT_EQ("1s 2s 0g0 4g0 3", GetTabStripStateString(tabstrip(), true));

  tabstrip()->CloseAllTabs();

  PrepareTabs(tabstrip(), 5);
  tabstrip()->ActivateTabAt(2);
  tabstrip()->AddToNewSplit({3}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);
  tabstrip()->AddToNewGroup({0, 1, 2, 3, 4});
  ASSERT_EQ("0g0 1g0 2g0s 3g0s 4g0", GetTabStripStateString(tabstrip(), true));

  tabstrip()->RemoveFromGroup({1, 2, 3});
  EXPECT_EQ("1 0g0 4g0 2s 3s", GetTabStripStateString(tabstrip(), true));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, AddToNewGroupDeletesGroup) {
  tabstrip()->AppendWebContents(CreateWebContents(), true);
  tabstrip()->AddToNewGroup({0});
  EXPECT_EQ(tabstrip()->group_model()->ListTabGroups().size(), 1U);
  std::optional<tab_groups::TabGroupId> group =
      tabstrip()->GetTabGroupForTab(0);

  tabstrip()->AddToNewGroup({0});

  EXPECT_EQ(tabstrip()->group_model()->ListTabGroups().size(), 1U);
  EXPECT_NE(tabstrip()->GetTabGroupForTab(0), group);

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, MoveGroupToTest) {
  PrepareTabs(tabstrip(), 5);

  const tab_groups::TabGroupId group1 = tabstrip()->AddToNewGroup({0, 1, 2});
  tabstrip()->MoveGroupTo(group1, 2);

  EXPECT_EQ("3 4 0 1 2", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(group1, tabstrip()->GetTabGroupForTab(4));

  observer()->ClearStates();
  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, AddToExistingGroupDeletesGroup) {
  tabstrip()->AppendWebContents(CreateWebContents(), true);
  tabstrip()->AppendWebContents(CreateWebContents(), false);
  tabstrip()->AddToNewGroup({0});
  tabstrip()->AddToNewGroup({1});
  EXPECT_EQ(tabstrip()->group_model()->ListTabGroups().size(), 2U);
  std::optional<tab_groups::TabGroupId> group =
      tabstrip()->GetTabGroupForTab(1);

  tabstrip()->AddToExistingGroup({1}, tabstrip()->GetTabGroupForTab(0).value());

  EXPECT_EQ(tabstrip()->group_model()->ListTabGroups().size(), 1U);
  EXPECT_NE(tabstrip()->group_model()->ListTabGroups()[0], group);

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, CloseTabDeletesGroup) {
  tabstrip()->AppendWebContents(CreateWebContents(), true);
  tabstrip()->AddToNewGroup({0});
  EXPECT_EQ(tabstrip()->group_model()->ListTabGroups().size(), 1U);

  tabstrip()->CloseWebContentsAt(0, TabCloseTypes::CLOSE_USER_GESTURE);

  EXPECT_EQ(tabstrip()->group_model()->ListTabGroups().size(), 0U);
}

TEST_F(TabStripModelTest, CloseTabNotifiesObserversOfGroupChange) {
  tabstrip()->AppendWebContents(CreateWebContents(), true);
  observer()->ClearStates();

  tab_groups::TabGroupId group = tabstrip()->AddToNewGroup({0});
  EXPECT_EQ(1u, observer()->group_updates().size());
  EXPECT_EQ(1, observer()->group_update(group).contents_update_count);

  observer()->ClearStates();
  tabstrip()->CloseWebContentsAt(0, TabCloseTypes::CLOSE_USER_GESTURE);
  EXPECT_EQ(0u, observer()->group_updates().size());
}

TEST_F(TabStripModelTest, InsertWebContentsAtWithGroupNotifiesObservers) {
  tabstrip()->AppendWebContents(CreateWebContents(), true);
  tabstrip()->AppendWebContents(CreateWebContents(), false);
  observer()->ClearStates();

  tab_groups::TabGroupId group = tabstrip()->AddToNewGroup({0, 1});
  EXPECT_EQ(1u, observer()->group_updates().size());
  EXPECT_EQ(2, observer()->group_update(group).contents_update_count);

  tabstrip()->InsertWebContentsAt(1, CreateWebContents(), AddTabTypes::ADD_NONE,
                                  group);

  EXPECT_EQ(1u, observer()->group_updates().size());
  EXPECT_EQ(3, observer()->group_update(group).contents_update_count);

  observer()->ClearStates();
  tabstrip()->CloseAllTabs();
}

// When inserting a WebContents, if a group is not specified, the new tab
// should be left ungrouped.
TEST_F(TabStripModelTest, InsertWebContentsAtDoesNotGroupByDefault) {
  tabstrip()->AppendWebContents(CreateWebContents(), true);
  tabstrip()->AppendWebContents(CreateWebContents(), false);
  tabstrip()->AddToNewGroup({0, 1});

  tabstrip()->InsertWebContentsAt(2, CreateWebContents(),
                                  AddTabTypes::ADD_NONE);

  // The newly added tab should not be in the group.
  EXPECT_TRUE(tabstrip()->GetTabGroupForTab(0).has_value());
  EXPECT_TRUE(tabstrip()->GetTabGroupForTab(1).has_value());
  EXPECT_FALSE(tabstrip()->GetTabGroupForTab(2).has_value());

  tabstrip()->CloseAllTabs();
}

// When inserting a WebContents, if a group is specified, the new tab should be
// added to that group.
TEST_F(TabStripModelTest, InsertWebContentsAtWithGroupGroups) {
  tabstrip()->AppendWebContents(CreateWebContentsWithID(0), true);
  tabstrip()->AppendWebContents(CreateWebContentsWithID(1), false);
  tabstrip()->AddToNewGroup({0, 1});
  std::optional<tab_groups::TabGroupId> group =
      tabstrip()->GetTabGroupForTab(0);

  tabstrip()->InsertWebContentsAt(1, CreateWebContentsWithID(2),
                                  AddTabTypes::ADD_NONE, group);

  EXPECT_EQ(tabstrip()->GetTabGroupForTab(0), group);
  EXPECT_EQ(tabstrip()->GetTabGroupForTab(1), group);
  EXPECT_EQ(tabstrip()->GetTabGroupForTab(2), group);
  EXPECT_EQ("0 2 1", GetTabStripStateString(tabstrip()));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, NewTabWithGroup) {
  PrepareTabs(tabstrip(), 3);
  auto group = tabstrip()->AddToNewGroup({1});

  tabstrip()->AddWebContents(CreateWebContentsWithID(3), 2,
                             ui::PAGE_TRANSITION_TYPED, AddTabTypes::ADD_NONE,
                             group);
  EXPECT_EQ("0 1 3 2", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(group, tabstrip()->GetTabGroupForTab(2));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, NewTabWithGroupDeletedCorrectly) {
  tabstrip()->AppendWebContents(CreateWebContents(), true);
  tabstrip()->AddToNewGroup({0});
  tabstrip()->InsertWebContentsAt(1, CreateWebContents(), AddTabTypes::ADD_NONE,
                                  tabstrip()->GetTabGroupForTab(0));

  tabstrip()->RemoveFromGroup({1});
  EXPECT_EQ(tabstrip()->group_model()->ListTabGroups().size(), 1U);
  tabstrip()->RemoveFromGroup({0});
  EXPECT_EQ(tabstrip()->group_model()->ListTabGroups().size(), 0U);

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, NewTabWithoutIndexInsertsAtEndOfGroup) {
  PrepareTabs(tabstrip(), 3);
  auto group = tabstrip()->AddToNewGroup({0, 1});

  tabstrip()->AddWebContents(CreateWebContentsWithID(3), -1,
                             ui::PAGE_TRANSITION_TYPED, AddTabTypes::ADD_NONE,
                             group);
  EXPECT_EQ("0 1 3 2", GetTabStripStateString(tabstrip()));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, DiscontinuousNewTabIndexTooHigh) {
  PrepareTabs(tabstrip(), 3);
  auto group = tabstrip()->AddToNewGroup({0, 1});

  tabstrip()->AddWebContents(CreateWebContentsWithID(3), 3,
                             ui::PAGE_TRANSITION_TYPED, AddTabTypes::ADD_NONE,
                             group);
  EXPECT_EQ("0 1 3 2", GetTabStripStateString(tabstrip()));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, DiscontinuousNewTabIndexTooLow) {
  PrepareTabs(tabstrip(), 3);
  auto group = tabstrip()->AddToNewGroup({1, 2});

  tabstrip()->AddWebContents(CreateWebContentsWithID(3), 0,
                             ui::PAGE_TRANSITION_TYPED, AddTabTypes::ADD_NONE,
                             group);
  EXPECT_EQ("0 3 1 2", GetTabStripStateString(tabstrip()));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, CreateGroupSetsVisualData) {
  tab_groups::ColorLabelMap all_colors = tab_groups::GetTabGroupColorLabelMap();
  PrepareTabs(tabstrip(), all_colors.size() + 1);

  // Expect groups to cycle through the available color set.
  int index = 0;
  for (const auto& color_pair : all_colors) {
    const tab_groups::TabGroupId group = tabstrip()->AddToNewGroup({index});
    EXPECT_EQ(
        tabstrip()->group_model()->GetTabGroup(group)->visual_data()->color(),
        color_pair.first);
    ++index;
  }

  // Expect the last group to cycle back to the first color.
  const tab_groups::TabGroupId group = tabstrip()->AddToNewGroup({index});
  EXPECT_EQ(
      tabstrip()->group_model()->GetTabGroup(group)->visual_data()->color(),
      all_colors.begin()->first);

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, SetVisualDataForGroup) {
  PrepareTabs(tabstrip(), 1);
  const tab_groups::TabGroupId group = tabstrip()->AddToNewGroup({0});

  const tab_groups::TabGroupVisualData new_data(
      u"Foo", tab_groups::TabGroupColorId::kCyan);
  tabstrip()->ChangeTabGroupVisuals(group, new_data);
  const tab_groups::TabGroupVisualData* data =
      tabstrip()->group_model()->GetTabGroup(group)->visual_data();
  EXPECT_EQ(data->title(), new_data.title());
  EXPECT_EQ(data->color(), new_data.color());

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, VisualDataChangeNotifiesObservers) {
  PrepareTabs(tabstrip(), 1);
  const tab_groups::TabGroupId group = tabstrip()->AddToNewGroup({0});

  // Check that we are notified about the placeholder
  // tab_groups::TabGroupVisualData.
  ASSERT_EQ(1u, observer()->group_updates().size());
  EXPECT_EQ(1, observer()->group_update(group).contents_update_count);

  const tab_groups::TabGroupVisualData new_data(
      u"Foo", tab_groups::TabGroupColorId::kBlue);
  tabstrip()->ChangeTabGroupVisuals(group, new_data);

  // Now check that we are notified when we change it, once at creation
  // and once from the explicit update.
  ASSERT_EQ(1u, observer()->group_updates().size());
  EXPECT_EQ(2, observer()->group_update(group).visuals_update_count);

  observer()->ClearStates();
  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, MovingTabToStartOfGroupDoesNotChangeGroup) {
  PrepareTabs(tabstrip(), 5);
  const auto group = tabstrip()->AddToNewGroup({1, 2, 3});

  tabstrip()->MoveWebContentsAt(2, 1, false);
  EXPECT_EQ("0 2 1 3 4", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(group, tabstrip()->GetTabGroupForTab(1));
  EXPECT_EQ(group, tabstrip()->GetTabGroupForTab(2));
  EXPECT_EQ(group, tabstrip()->GetTabGroupForTab(3));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, MovingTabToMiddleOfGroupDoesNotChangeGroup) {
  PrepareTabs(tabstrip(), 5);
  const auto group = tabstrip()->AddToNewGroup({1, 2, 3});

  tabstrip()->MoveWebContentsAt(1, 2, false);
  EXPECT_EQ("0 2 1 3 4", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(group, tabstrip()->GetTabGroupForTab(1));
  EXPECT_EQ(group, tabstrip()->GetTabGroupForTab(2));
  EXPECT_EQ(group, tabstrip()->GetTabGroupForTab(3));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, MovingTabToEndOfGroupDoesNotChangeGroup) {
  PrepareTabs(tabstrip(), 5);
  const auto group = tabstrip()->AddToNewGroup({1, 2, 3});

  tabstrip()->MoveWebContentsAt(2, 3, false);
  EXPECT_EQ("0 1 3 2 4", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(group, tabstrip()->GetTabGroupForTab(1));
  EXPECT_EQ(group, tabstrip()->GetTabGroupForTab(2));
  EXPECT_EQ(group, tabstrip()->GetTabGroupForTab(3));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, MovingTabOutsideOfGroupToStartOfTabstripClearsGroup) {
  PrepareTabs(tabstrip(), 5);
  const auto group = tabstrip()->AddToNewGroup({1, 2, 3});

  tabstrip()->MoveWebContentsAt(1, 0, false);
  EXPECT_EQ("1 0 2 3 4", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(std::nullopt, tabstrip()->GetTabGroupForTab(0));
  EXPECT_EQ(std::nullopt, tabstrip()->GetTabGroupForTab(1));
  EXPECT_EQ(group, tabstrip()->GetTabGroupForTab(2));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, MovingTabOutsideOfGroupToEndOfTabstripClearsGroup) {
  PrepareTabs(tabstrip(), 5);
  const auto group = tabstrip()->AddToNewGroup({1, 2, 3});

  tabstrip()->MoveWebContentsAt(3, 4, false);
  EXPECT_EQ("0 1 2 4 3", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(group, tabstrip()->GetTabGroupForTab(2));
  EXPECT_EQ(std::nullopt, tabstrip()->GetTabGroupForTab(3));
  EXPECT_EQ(std::nullopt, tabstrip()->GetTabGroupForTab(4));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, MovingTabBetweenUngroupedTabsClearsGroup) {
  PrepareTabs(tabstrip(), 5);
  tabstrip()->AddToNewGroup({0, 1, 2});

  tabstrip()->MoveWebContentsAt(1, 3, false);
  EXPECT_EQ("0 2 3 1 4", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(std::nullopt, tabstrip()->GetTabGroupForTab(2));
  EXPECT_EQ(std::nullopt, tabstrip()->GetTabGroupForTab(3));
  EXPECT_EQ(std::nullopt, tabstrip()->GetTabGroupForTab(4));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, MovingUngroupedTabBetweenGroupsDoesNotAssignGroup) {
  PrepareTabs(tabstrip(), 5);
  const auto group1 = tabstrip()->AddToNewGroup({1, 2});
  const auto group2 = tabstrip()->AddToNewGroup({3, 4});

  tabstrip()->MoveWebContentsAt(0, 2, false);
  EXPECT_EQ("1 2 0 3 4", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(group1, tabstrip()->GetTabGroupForTab(1));
  EXPECT_EQ(std::nullopt, tabstrip()->GetTabGroupForTab(2));
  EXPECT_EQ(group2, tabstrip()->GetTabGroupForTab(3));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest,
       MovingUngroupedTabBetweenGroupAndUngroupedDoesNotAssignGroup) {
  PrepareTabs(tabstrip(), 4);
  const auto group = tabstrip()->AddToNewGroup({1, 2});

  tabstrip()->MoveWebContentsAt(0, 2, false);
  EXPECT_EQ("1 2 0 3", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(group, tabstrip()->GetTabGroupForTab(1));
  EXPECT_EQ(std::nullopt, tabstrip()->GetTabGroupForTab(2));
  EXPECT_EQ(std::nullopt, tabstrip()->GetTabGroupForTab(3));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest,
       MovingUngroupedTabBetweenUngroupedAndGroupDoesNotAssignGroup) {
  PrepareTabs(tabstrip(), 4);
  const auto group = tabstrip()->AddToNewGroup({2, 3});

  tabstrip()->MoveWebContentsAt(0, 1, false);
  EXPECT_EQ("1 0 2 3", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(std::nullopt, tabstrip()->GetTabGroupForTab(0));
  EXPECT_EQ(std::nullopt, tabstrip()->GetTabGroupForTab(1));
  EXPECT_EQ(group, tabstrip()->GetTabGroupForTab(2));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest,
       MovingGroupMemberBetweenTwoDifferentGroupsClearsGroup) {
  PrepareTabs(tabstrip(), 6);
  const auto group1 = tabstrip()->AddToNewGroup({0, 1});
  const auto group2 = tabstrip()->AddToNewGroup({2, 3});
  const auto group3 = tabstrip()->AddToNewGroup({4, 5});

  tabstrip()->MoveWebContentsAt(0, 3, false);
  EXPECT_EQ("1 2 3 0 4 5", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(group1, tabstrip()->GetTabGroupForTab(0));
  EXPECT_EQ(group2, tabstrip()->GetTabGroupForTab(2));
  EXPECT_EQ(std::nullopt, tabstrip()->GetTabGroupForTab(3));
  EXPECT_EQ(group3, tabstrip()->GetTabGroupForTab(4));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest,
       MovingSingleTabGroupBetweenTwoGroupsDoesNotClearGroup) {
  PrepareTabs(tabstrip(), 5);
  const auto group1 = tabstrip()->AddToNewGroup({0});
  const auto group2 = tabstrip()->AddToNewGroup({1, 2});
  const auto group3 = tabstrip()->AddToNewGroup({3, 4});

  tabstrip()->MoveWebContentsAt(0, 2, false);
  EXPECT_EQ("1 2 0 3 4", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(group2, tabstrip()->GetTabGroupForTab(0));
  EXPECT_EQ(group2, tabstrip()->GetTabGroupForTab(1));
  EXPECT_EQ(group1, tabstrip()->GetTabGroupForTab(2));
  EXPECT_EQ(group3, tabstrip()->GetTabGroupForTab(3));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, MovingUngroupedTabIntoGroupSetsGroup) {
  PrepareTabs(tabstrip(), 3);
  const auto group = tabstrip()->AddToNewGroup({1, 2});

  tabstrip()->MoveWebContentsAt(0, 1, false);
  EXPECT_EQ("1 0 2", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(group, tabstrip()->GetTabGroupForTab(0));
  EXPECT_EQ(group, tabstrip()->GetTabGroupForTab(1));
  EXPECT_EQ(group, tabstrip()->GetTabGroupForTab(2));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, MovingGroupedTabIntoGroupChangesGroup) {
  PrepareTabs(tabstrip(), 3);
  tabstrip()->AddToNewGroup({0});
  const auto group2 = tabstrip()->AddToNewGroup({1, 2});

  tabstrip()->MoveWebContentsAt(0, 1, false);
  EXPECT_EQ("1 0 2", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(group2, tabstrip()->GetTabGroupForTab(0));
  EXPECT_EQ(group2, tabstrip()->GetTabGroupForTab(1));
  EXPECT_EQ(group2, tabstrip()->GetTabGroupForTab(2));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, MoveWebContentsAtCorrectlyRemovesGroupEntries) {
  PrepareTabs(tabstrip(), 3);
  tabstrip()->AddToNewGroup({0});
  const auto group2 = tabstrip()->AddToNewGroup({1, 2});

  tabstrip()->MoveWebContentsAt(0, 1, false);
  EXPECT_EQ("1 0 2", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(group2, tabstrip()->GetTabGroupForTab(1));
  const std::vector<tab_groups::TabGroupId> expected_groups{group2};
  EXPECT_EQ(expected_groups, tabstrip()->group_model()->ListTabGroups());

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, MoveWebContentsAtCorrectlySendsGroupChangedEvent) {
  PrepareTabs(tabstrip(), 3);

  const tab_groups::TabGroupId group1 = tabstrip()->AddToNewGroup({0});
  const tab_groups::TabGroupId group2 = tabstrip()->AddToNewGroup({1, 2});

  EXPECT_EQ(2u, observer()->group_updates().size());
  EXPECT_EQ(1, observer()->group_update(group1).contents_update_count);
  EXPECT_EQ(2, observer()->group_update(group2).contents_update_count);

  tabstrip()->MoveWebContentsAt(0, 1, false);
  EXPECT_EQ("1 0 2", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(group2, tabstrip()->GetTabGroupForTab(1));

  // group1 should be deleted. group2 should have an update.
  EXPECT_EQ(1u, observer()->group_updates().size());
  EXPECT_EQ(3, observer()->group_update(group2).contents_update_count);

  observer()->ClearStates();
  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, MoveWebContentsAtCorrectlySendsGroupClearedEvent) {
  PrepareTabs(tabstrip(), 3);

  const tab_groups::TabGroupId group1 = tabstrip()->AddToNewGroup({0, 1});
  const tab_groups::TabGroupId group2 = tabstrip()->AddToNewGroup({2});
  EXPECT_EQ(2u, observer()->group_updates().size());
  EXPECT_EQ(2, observer()->group_update(group1).contents_update_count);
  EXPECT_EQ(1, observer()->group_update(group2).contents_update_count);

  tabstrip()->MoveWebContentsAt(0, 2, false);
  EXPECT_EQ("1 2 0", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(std::nullopt, tabstrip()->GetTabGroupForTab(2));

  // The tab should be removed from group1 but not added to group2.
  EXPECT_EQ(2u, observer()->group_updates().size());
  EXPECT_EQ(3, observer()->group_update(group1).contents_update_count);
  EXPECT_EQ(1, observer()->group_update(group2).contents_update_count);

  observer()->ClearStates();
  tabstrip()->CloseAllTabs();
}

// Ensure that the opener for a tab never refers to a dangling WebContents.
// Regression test for crbug.com/1092308.
TEST_F(TabStripModelTest, DanglingOpener) {
  PrepareTabs(tabstrip(), 2);

  WebContents* contents_1 = tabstrip()->GetWebContentsAt(0);
  WebContents* contents_2 = tabstrip()->GetWebContentsAt(1);
  ASSERT_TRUE(contents_1);
  ASSERT_TRUE(contents_2);

  // Set the openers for the two tabs to each other.
  tabstrip()->SetOpenerOfWebContentsAt(0, contents_2);
  tabstrip()->SetOpenerOfWebContentsAt(1, contents_1);
  EXPECT_EQ("0 1", GetTabStripStateString(tabstrip()));

  // Move the first tab to the end of the tab tabstrip()->
  EXPECT_EQ(1,
            tabstrip()->MoveWebContentsAt(0, 1, false /* select_after_move */));
  EXPECT_EQ("1 0", GetTabStripStateString(tabstrip()));

  // Replace the WebContents at index 0 with a new WebContents.
  std::unique_ptr<WebContents> replaced_contents =
      tabstrip()->DiscardWebContentsAt(0, CreateWebContentsWithID(5));
  EXPECT_EQ(contents_2, replaced_contents.get());
  replaced_contents.reset();
  EXPECT_EQ("5 0", GetTabStripStateString(tabstrip()));
  ASSERT_TRUE(contents_2);

  // Ensure the opener for the tab at index 0 isn't dangling. It should be null
  // instead.
  tabs::TabInterface* opener = tabstrip()->GetOpenerOfTabAt(0);
  EXPECT_FALSE(opener);

  tabstrip()->CloseAllTabs();
}

class TabToWindowTestTabStripModelDelegate : public TestTabStripModelDelegate {
 public:
  bool CanMoveTabsToWindow(const std::vector<int>& indices) override {
    for (int index : indices) {
      can_move_calls_.push_back(index);
    }
    return true;
  }

  void MoveTabsToNewWindow(const std::vector<int>& indices) override {
    for (int index : indices) {
      move_calls_.push_back(index);
    }
  }

  void MoveGroupToNewWindow(const tab_groups::TabGroupId& group) override {}

  std::vector<int> can_move_calls() { return can_move_calls_; }
  std::vector<int> move_calls() { return move_calls_; }

 private:
  std::vector<int> can_move_calls_;
  std::vector<int> move_calls_;
};

// Sanity check to ensure that the "Move Tabs to Window" command talks to
// the delegate correctly.
TEST_F(TabStripModelTest, MoveTabsToNewWindow) {
  TabToWindowTestTabStripModelDelegate delegate;
  TabStripModel tabstrip(&delegate, profile());
  PrepareTabs(&tabstrip, 3);

  EXPECT_EQ(delegate.can_move_calls().size(), 0u);
  EXPECT_EQ(delegate.move_calls().size(), 0u);

  EXPECT_TRUE(tabstrip.IsContextMenuCommandEnabled(
      2, TabStripModel::CommandMoveTabsToNewWindow));

  // ASSERT and not EXPECT since we're accessing back() later.
  ASSERT_EQ(delegate.can_move_calls().size(), 1u);
  EXPECT_EQ(delegate.move_calls().size(), 0u);
  EXPECT_EQ(delegate.can_move_calls().back(), 2);

  tabstrip.ExecuteContextMenuCommand(0,
                                     TabStripModel::CommandMoveTabsToNewWindow);
  // Whether ExecuteCommand checks if the command is valid or not is an
  // implementation detail, so let's not be brittle.
  EXPECT_GT(delegate.can_move_calls().size(), 0u);
  ASSERT_EQ(delegate.move_calls().size(), 1u);
  EXPECT_EQ(delegate.move_calls().back(), 0);

  tabstrip.CloseAllTabs();
}

TEST_F(TabStripModelTest, SurroundingGroupAtIndex) {
  PrepareTabs(tabstrip(), 4);

  auto group1 = tabstrip()->AddToNewGroup({1, 2});
  tabstrip()->AddToNewGroup({3});

  EXPECT_EQ(std::nullopt, tabstrip()->GetSurroundingTabGroup(0));
  EXPECT_EQ(std::nullopt, tabstrip()->GetSurroundingTabGroup(1));
  EXPECT_EQ(group1, tabstrip()->GetSurroundingTabGroup(2));
  EXPECT_EQ(std::nullopt, tabstrip()->GetSurroundingTabGroup(3));
  EXPECT_EQ(std::nullopt, tabstrip()->GetSurroundingTabGroup(4));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, ActivateRecordsStartTime) {
  PrepareTabs(tabstrip(), 2);

  // PrepareTabs should leave the last tab active.
  ASSERT_EQ(tabstrip()->GetActiveWebContents(),
            tabstrip()->GetWebContentsAt(1));
  ASSERT_FALSE(HasTabSwitchStartTimeAtIndex(0));
  ASSERT_FALSE(HasTabSwitchStartTimeAtIndex(1));

  // ActivateTabAt should only update the start time if the active tab changes.
  tabstrip()->ActivateTabAt(
      1, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));
  EXPECT_FALSE(HasTabSwitchStartTimeAtIndex(0));
  EXPECT_FALSE(HasTabSwitchStartTimeAtIndex(1));
  tabstrip()->ActivateTabAt(
      0, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));
  EXPECT_TRUE(HasTabSwitchStartTimeAtIndex(0));
  EXPECT_FALSE(HasTabSwitchStartTimeAtIndex(1));
  tabstrip()->ActivateTabAt(
      1, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));
  EXPECT_TRUE(HasTabSwitchStartTimeAtIndex(0));
  EXPECT_TRUE(HasTabSwitchStartTimeAtIndex(1));
}

TEST_F(TabStripModelTest, ActivateRecordsStartTime_UnSplitToSplit) {
  // Create 3 tabs with a split containing tabs 1 and 2.
  PrepareTabs(tabstrip(), 3);
  ASSERT_EQ(tabstrip()->GetActiveWebContents(),
            tabstrip()->GetWebContentsAt(2));
  tabstrip()->AddToNewSplit({1}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);

  // ActivateTabAt should update the start time when the tab outside the split
  // becomes active.
  EXPECT_FALSE(HasTabSwitchStartTimeAtIndex(0));
  tabstrip()->ActivateTabAt(
      0, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));
  EXPECT_TRUE(HasTabSwitchStartTimeAtIndex(0));
}

TEST_F(TabStripModelTest, ActivateRecordsStartTime_SplitToUnSplit) {
  // Create 3 tabs with a split containing tabs 1 and 2.
  PrepareTabs(tabstrip(), 3);
  ASSERT_EQ(tabstrip()->GetActiveWebContents(),
            tabstrip()->GetWebContentsAt(2));
  tabstrip()->AddToNewSplit({1}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);
  tabstrip()->ActivateTabAt(0);

  // ActivateTabAt should update the start time when a tab in the split becomes
  // active. Only the tab that was activated should get a start time.
  EXPECT_FALSE(HasTabSwitchStartTimeAtIndex(1));
  EXPECT_FALSE(HasTabSwitchStartTimeAtIndex(2));
  tabstrip()->ActivateTabAt(
      1, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));
  EXPECT_TRUE(HasTabSwitchStartTimeAtIndex(1));
  EXPECT_FALSE(HasTabSwitchStartTimeAtIndex(2));
}

TEST_F(TabStripModelTest, ActivateRecordsStartTime_SplitToSameSplit) {
  // Create 3 tabs with a split containing tabs 1 and 2.
  PrepareTabs(tabstrip(), 3);
  ASSERT_EQ(tabstrip()->GetActiveWebContents(),
            tabstrip()->GetWebContentsAt(2));
  tabstrip()->AddToNewSplit({1}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);

  // ActivateTabAt should not update the start time when the other tab in the
  // split becomes active.
  EXPECT_FALSE(HasTabSwitchStartTimeAtIndex(1));
  EXPECT_FALSE(HasTabSwitchStartTimeAtIndex(2));
  tabstrip()->ActivateTabAt(
      1, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));
  EXPECT_FALSE(HasTabSwitchStartTimeAtIndex(1));
  EXPECT_FALSE(HasTabSwitchStartTimeAtIndex(2));
}

TEST_F(TabStripModelTest, ActivateRecordsStartTime_SplitToOtherSplit) {
  // Create 4 tabs, with a split containing tabs 0 and 1, and a split containing
  // tabs 2 and 3.
  PrepareTabs(tabstrip(), 4);
  ASSERT_EQ(tabstrip()->GetActiveWebContents(),
            tabstrip()->GetWebContentsAt(3));
  tabstrip()->AddToNewSplit({2}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);
  tabstrip()->ActivateTabAt(0);
  tabstrip()->AddToNewSplit({1}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);

  // ActivateTabAt should update the start time when a tab in the other split
  // becomes active. Only the tab that was activated should get a start time.
  ASSERT_FALSE(HasTabSwitchStartTimeAtIndex(2));
  ASSERT_FALSE(HasTabSwitchStartTimeAtIndex(3));
  tabstrip()->ActivateTabAt(
      2, TabStripUserGestureDetails(
             TabStripUserGestureDetails::GestureType::kOther));
  EXPECT_TRUE(HasTabSwitchStartTimeAtIndex(2));
  EXPECT_FALSE(HasTabSwitchStartTimeAtIndex(3));
}

TEST_F(TabStripModelTest, ToggleSiteMuted) {

  GURL url("https://example.com/");
  HostContentSettingsMap* settings =
      HostContentSettingsMapFactory::GetForProfile(profile());

  std::unique_ptr<WebContents> new_tab_contents = CreateWebContents();
  content::WebContentsTester::For(new_tab_contents.get())
      ->SetLastCommittedURL(url);

  tabstrip()->AddWebContents(std::move(new_tab_contents), -1,
                             ui::PAGE_TRANSITION_TYPED,
                             AddTabTypes::ADD_ACTIVE);

  // Validate if the mute site menu item shows up and the site is unmuted
  EXPECT_TRUE(tabstrip()->IsContextMenuCommandEnabled(
      0, TabStripModel::CommandToggleSiteMuted));
  EXPECT_FALSE(IsSiteMuted(*tabstrip(), 0));

  // Validate if toggling the state successfully mutes the site
  tabstrip()->ExecuteContextMenuCommand(0,
                                        TabStripModel::CommandToggleSiteMuted);
  EXPECT_TRUE(IsSiteMuted(*tabstrip(), 0));
  EXPECT_TRUE(IsSiteInContentSettingExceptionList(settings, url,
                                                  ContentSettingsType::SOUND));

  // Toggling the state again to successfully unmute the site
  tabstrip()->ExecuteContextMenuCommand(0,
                                        TabStripModel::CommandToggleSiteMuted);
  EXPECT_FALSE(IsSiteMuted(*tabstrip(), 0));
  EXPECT_FALSE(IsSiteInContentSettingExceptionList(settings, url,
                                                   ContentSettingsType::SOUND));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, ToggleSiteMutedWithLessSpecificRule) {

  GURL url("https://example.com/");
  HostContentSettingsMap* settings =
      HostContentSettingsMapFactory::GetForProfile(profile());

  std::unique_ptr<WebContents> new_tab_contents = CreateWebContents();
  content::WebContentsTester::For(new_tab_contents.get())
      ->SetLastCommittedURL(url);

  tabstrip()->AddWebContents(std::move(new_tab_contents), -1,
                             ui::PAGE_TRANSITION_TYPED,
                             AddTabTypes::ADD_ACTIVE);

  // Validate if the mute site menu item shows up and the site is unmuted
  EXPECT_TRUE(tabstrip()->IsContextMenuCommandEnabled(
      0, TabStripModel::CommandToggleSiteMuted));
  EXPECT_FALSE(IsSiteMuted(*tabstrip(), 0));

  // Add a wildcard to mute all HTTPS sites as a custom behavior
  ContentSettingsPattern primary_pattern =
      ContentSettingsPattern::FromString("https://*");
  ContentSettingsPattern secondary_pattern =
      ContentSettingsPattern::FromString("*");
  settings->SetContentSettingCustomScope(primary_pattern, secondary_pattern,
                                         ContentSettingsType::SOUND,
                                         CONTENT_SETTING_BLOCK);
  EXPECT_TRUE(IsSiteMuted(*tabstrip(), 0));

  // Validate we are able to unmute the site (with the wildcard custom behavior)
  tabstrip()->ExecuteContextMenuCommand(0,
                                        TabStripModel::CommandToggleSiteMuted);
  EXPECT_FALSE(IsSiteMuted(*tabstrip(), 0));
  EXPECT_TRUE(IsSiteInContentSettingExceptionList(settings, url,
                                                  ContentSettingsType::SOUND));

  // Validate we are able to mute the site
  tabstrip()->ExecuteContextMenuCommand(0,
                                        TabStripModel::CommandToggleSiteMuted);
  EXPECT_TRUE(IsSiteMuted(*tabstrip(), 0));

  // Validate we are able to unmute the site
  tabstrip()->ExecuteContextMenuCommand(0,
                                        TabStripModel::CommandToggleSiteMuted);
  EXPECT_FALSE(IsSiteMuted(*tabstrip(), 0));
  EXPECT_TRUE(IsSiteInContentSettingExceptionList(settings, url,
                                                  ContentSettingsType::SOUND));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, ToggleSiteMutedWithOtherDisjointRule) {

  GURL url("https://example.com/");
  HostContentSettingsMap* settings =
      HostContentSettingsMapFactory::GetForProfile(profile());

  std::unique_ptr<WebContents> new_tab_contents = CreateWebContents();
  content::WebContentsTester::For(new_tab_contents.get())
      ->SetLastCommittedURL(url);

  tabstrip()->AddWebContents(std::move(new_tab_contents), -1,
                             ui::PAGE_TRANSITION_TYPED,
                             AddTabTypes::ADD_ACTIVE);

  // Validate if the mute site menu item shows up and the site is unmuted
  EXPECT_TRUE(tabstrip()->IsContextMenuCommandEnabled(
      0, TabStripModel::CommandToggleSiteMuted));
  EXPECT_FALSE(IsSiteMuted(*tabstrip(), 0));

  // Add a wildcard to mute all HTTPS sites as a custom behavior
  ContentSettingsPattern primary_pattern =
      ContentSettingsPattern::FromString("https://www.google.com");
  ContentSettingsPattern secondary_pattern =
      ContentSettingsPattern::FromString("*");
  settings->SetContentSettingCustomScope(primary_pattern, secondary_pattern,
                                         ContentSettingsType::SOUND,
                                         CONTENT_SETTING_BLOCK);
  EXPECT_FALSE(IsSiteMuted(*tabstrip(), 0));

  // Validate we are able to mute the site
  tabstrip()->ExecuteContextMenuCommand(0,
                                        TabStripModel::CommandToggleSiteMuted);
  EXPECT_TRUE(IsSiteMuted(*tabstrip(), 0));
  EXPECT_TRUE(IsSiteInContentSettingExceptionList(settings, url,
                                                  ContentSettingsType::SOUND));

  // Validate we are able to unmute the site
  tabstrip()->ExecuteContextMenuCommand(0,
                                        TabStripModel::CommandToggleSiteMuted);
  EXPECT_FALSE(IsSiteMuted(*tabstrip(), 0));
  EXPECT_FALSE(IsSiteInContentSettingExceptionList(settings, url,
                                                   ContentSettingsType::SOUND));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, ToggleSiteMutedWithDifferentDefault) {

  GURL url("https://example.com/");
  HostContentSettingsMap* settings =
      HostContentSettingsMapFactory::GetForProfile(profile());

  std::unique_ptr<WebContents> new_tab_contents = CreateWebContents();
  content::WebContentsTester::For(new_tab_contents.get())
      ->SetLastCommittedURL(url);

  tabstrip()->AddWebContents(std::move(new_tab_contents), -1,
                             ui::PAGE_TRANSITION_TYPED,
                             AddTabTypes::ADD_ACTIVE);

  settings->SetDefaultContentSetting(ContentSettingsType::SOUND,
                                     ContentSetting::CONTENT_SETTING_BLOCK);

  // Validate if the mute site menu item shows up and the site is muted
  EXPECT_TRUE(tabstrip()->IsContextMenuCommandEnabled(
      0, TabStripModel::CommandToggleSiteMuted));
  EXPECT_TRUE(IsSiteMuted(*tabstrip(), 0));

  // Validate if toggling the state successfully unmutes the site
  tabstrip()->ExecuteContextMenuCommand(0,
                                        TabStripModel::CommandToggleSiteMuted);
  EXPECT_FALSE(IsSiteMuted(*tabstrip(), 0));
  EXPECT_TRUE(IsSiteInContentSettingExceptionList(settings, url,
                                                  ContentSettingsType::SOUND));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, ToggleMuteUnmuteMultipleSites) {

  GURL url1("https://example1.com/");
  std::unique_ptr<WebContents> new_tab_contents1 = CreateWebContents();
  content::WebContentsTester::For(new_tab_contents1.get())
      ->SetLastCommittedURL(url1);
  tabstrip()->AddWebContents(std::move(new_tab_contents1), -1,
                             ui::PAGE_TRANSITION_TYPED,
                             AddTabTypes::ADD_ACTIVE);
  EXPECT_FALSE(IsSiteMuted(*tabstrip(), 0));

  GURL url2("https://example2.com/");
  std::unique_ptr<WebContents> new_tab_contents2 = CreateWebContents();
  content::WebContentsTester::For(new_tab_contents2.get())
      ->SetLastCommittedURL(url2);
  tabstrip()->AddWebContents(std::move(new_tab_contents2), -1,
                             ui::PAGE_TRANSITION_TYPED,
                             AddTabTypes::ADD_ACTIVE);
  EXPECT_FALSE(IsSiteMuted(*tabstrip(), 1));

  tabstrip()->SelectTabAt(0);
  EXPECT_TRUE(tabstrip()->selection_model().IsSelected(1));

  tabstrip()->ExecuteContextMenuCommand(0,
                                        TabStripModel::CommandToggleSiteMuted);
  EXPECT_TRUE(IsSiteMuted(*tabstrip(), 0));
  EXPECT_TRUE(IsSiteMuted(*tabstrip(), 1));

  tabstrip()->ExecuteContextMenuCommand(0,
                                        TabStripModel::CommandToggleSiteMuted);
  EXPECT_FALSE(IsSiteMuted(*tabstrip(), 0));
  EXPECT_FALSE(IsSiteMuted(*tabstrip(), 1));

  tabstrip()->CloseAllTabs();
}

TEST_F(TabStripModelTest, AppendTab) {
  MockBrowserWindowInterface bwi;
  delegate()->SetBrowserWindowInterface(&bwi);
  ON_CALL(bwi, GetTabStripModel()).WillByDefault(::testing::Return(tabstrip()));
  ASSERT_TRUE(tabstrip()->empty());

  // Create a 2 tabs to serve as an opener and the previous opener.
  PrepareTabs(tabstrip(), 4);
  ASSERT_EQ(4, tabstrip()->count());

  // Force the opener of tab in index 1 to be tab at index 0.
  tabstrip()->SetOpenerOfWebContentsAt(1, tabstrip()->GetWebContentsAt(0));
  ASSERT_EQ(tabstrip()->GetTabAtIndex(0), tabstrip()->GetOpenerOfTabAt(1));

  // Detach 2 tabs for the test, one for each option.
  std::unique_ptr<tabs::TabModel> tab_model_with_foreground_true =
      tabstrip()->DetachTabAtForInsertion(2);
  tabs::TabInterface* tab_with_foreground_true_ptr =
      tab_model_with_foreground_true.get();
  ASSERT_EQ(3, tabstrip()->count());
  // Tabs not in a tabstrip are not supported - this should CHECK.
  ASSERT_DEATH_IF_SUPPORTED(
      tab_with_foreground_true_ptr->GetBrowserWindowInterface(), "");

  std::unique_ptr<tabs::TabModel> tab_model_with_foreground_false =
      tabstrip()->DetachTabAtForInsertion(2);
  tabs::TabInterface* tab_with_foreground_false_ptr =
      tab_model_with_foreground_false.get();
  ASSERT_EQ(2, tabstrip()->count());
  // Tabs not in a tabstrip are not supported - this should CHECK.
  ASSERT_DEATH_IF_SUPPORTED(
      tab_with_foreground_true_ptr->GetBrowserWindowInterface(), "");

  // Add a 3rd tab using the foreground option. When the foreground option is
  // used, the new tab should become active, and the previous tab should become
  // the opener for the newly active tab.
  tabstrip()->AppendTab(std::move(tab_model_with_foreground_true),
                        /*foreground=*/true);
  EXPECT_TRUE(tabstrip()->ContainsIndex(2));
  EXPECT_EQ(2, tabstrip()->active_index());
  EXPECT_EQ(tabstrip()->GetTabAtIndex(1), tabstrip()->GetOpenerOfTabAt(2));
  EXPECT_EQ(tab_with_foreground_true_ptr->GetBrowserWindowInterface()
                ->GetTabStripModel(),
            tabstrip());

  // Add a 4th tab using the non foreground option. this is similar to using the
  // AddType NONE, which should not set the active tab and should not inherit
  // the opener.
  tabstrip()->AppendTab(std::move(tab_model_with_foreground_false),
                        /*foreground=*/false);
  EXPECT_TRUE(tabstrip()->ContainsIndex(3));
  EXPECT_EQ(2, tabstrip()->active_index());
  EXPECT_EQ(nullptr, tabstrip()->GetOpenerOfTabAt(3));
  EXPECT_EQ(tab_with_foreground_false_ptr->GetBrowserWindowInterface()
                ->GetTabStripModel(),
            tabstrip());

  delegate()->SetBrowserWindowInterface(nullptr);
}

TEST_F(TabStripModelTest, SelectionChangedSingleOperationObserverTest) {
  // Add 4 tabs to the tabstrip model
  PrepareTabs(tabstrip(), 4);
  ASSERT_EQ(4, tabstrip()->count());
  tabstrip()->ActivateTabAt(0);

  // Check selection change after insertion.
  tabstrip()->InsertWebContentsAt(0, CreateWebContentsWithID(5),
                                  AddTabTypes::ADD_NONE);
  ObservedSelectionChange change = observer()->GetLatestSelectionChange();

  // Active webcontents and selection list should not change.
  EXPECT_EQ(change.old_tab, tabstrip()->GetTabAtIndex(1)->GetHandle());
  EXPECT_EQ(change.new_tab, tabstrip()->GetTabAtIndex(1)->GetHandle());

  EXPECT_EQ(change.old_model.active(), 1u);
  EXPECT_EQ(change.old_model.size(), 1u);

  EXPECT_EQ(change.new_model.active(), 1u);
  EXPECT_EQ(change.new_model.size(), 1u);

  // Check selection change after move.
  tabstrip()->MoveWebContentsAt(0, 2, false);
  change = observer()->GetLatestSelectionChange();

  // Active webcontents should not change but selection list changes.
  EXPECT_EQ(change.old_tab, tabstrip()->GetTabAtIndex(0)->GetHandle());
  EXPECT_EQ(change.new_tab, tabstrip()->GetTabAtIndex(0)->GetHandle());

  EXPECT_EQ(change.old_model.active(), 1u);
  EXPECT_EQ(change.old_model.size(), 1u);

  EXPECT_EQ(change.new_model.active(), 0u);
  EXPECT_EQ(change.new_model.size(), 1u);

  // Check selection change after move with select_after_move as true.
  tabstrip()->MoveWebContentsAt(1, 0, true);
  change = observer()->GetLatestSelectionChange();

  EXPECT_EQ(change.old_tab, tabstrip()->GetTabAtIndex(1)->GetHandle());
  EXPECT_EQ(change.new_tab, tabstrip()->GetTabAtIndex(0)->GetHandle());

  EXPECT_EQ(change.old_model.active(), 0u);
  EXPECT_EQ(change.old_model.size(), 1u);

  EXPECT_EQ(change.new_model.active(), 0u);
  EXPECT_EQ(change.new_model.size(), 1u);

  observer()->ClearStates();
}

TEST_F(TabStripModelTest, SelectionChangedForMoveGroupWithSelectedTab) {

  // Add 6 tabs to the tabstrip model.
  PrepareTabs(tabstrip(), 6);
  ASSERT_EQ(6, tabstrip()->count());
  tabstrip()->ActivateTabAt(2);

  // Group tabs 1, 2, and 3 into a tab group.
  tab_groups::TabGroupId group = tabstrip()->AddToNewGroup({1, 2, 3});
  ASSERT_EQ(group, tabstrip()->GetTabAtIndex(1)->GetGroup().value());

  tabstrip()->SelectTabAt(0);

  // Verify the selection model before moving the group.
  EXPECT_TRUE(tabstrip()->selection_model().IsSelected(2));
  EXPECT_EQ(tabstrip()->selection_model().active(), 0u);

  // Check selection change after moving the group.
  tabstrip()->MoveGroupTo(group, 2);
  ObservedSelectionChange change = observer()->GetLatestSelectionChange();

  // Active webcontents should not change and selection model updates.
  EXPECT_EQ(change.old_tab, tabstrip()->GetTabAtIndex(0)->GetHandle());
  EXPECT_EQ(change.new_tab, tabstrip()->GetTabAtIndex(0)->GetHandle());

  EXPECT_EQ(change.old_model.size(), 2u);

  EXPECT_EQ(change.new_model.active(), 0u);
  EXPECT_TRUE(change.new_model.IsSelected(3));
  EXPECT_EQ(change.new_model.size(), 2u);

  observer()->ClearStates();
}

TEST_F(TabStripModelTest, SelectionChangedForMoveSelectedTabsTo) {
  // Add 6 tabs to the tabstrip model.
  PrepareTabs(tabstrip(), 6);
  ASSERT_EQ(6, tabstrip()->count());
  tabstrip()->ActivateTabAt(2);

  tabstrip()->ActivateTabAt(0);
  tabstrip()->SelectTabAt(2);
  tabstrip()->SelectTabAt(4);

  // Verify the selection model before moving the tabs.
  EXPECT_TRUE(tabstrip()->selection_model().IsSelected(0));
  EXPECT_TRUE(tabstrip()->selection_model().IsSelected(2));
  EXPECT_TRUE(tabstrip()->selection_model().IsSelected(4));
  EXPECT_EQ(tabstrip()->selection_model().active(), 4u);

  // Move the selected tabs to index 3.
  tabstrip()->MoveSelectedTabsTo(3, std::nullopt);
  ObservedSelectionChange change = observer()->GetLatestSelectionChange();

  // Active webcontents and selection model should update correctly.
  EXPECT_EQ(change.old_tab, tabstrip()->GetTabAtIndex(5)->GetHandle());
  EXPECT_EQ(change.new_tab, tabstrip()->GetTabAtIndex(5)->GetHandle());

  EXPECT_EQ(change.old_model.size(), 3u);

  EXPECT_EQ(change.new_model.active(), 5u);
  EXPECT_TRUE(change.new_model.IsSelected(3));
  EXPECT_TRUE(change.new_model.IsSelected(4));
  EXPECT_TRUE(change.new_model.IsSelected(5));
  EXPECT_EQ(change.new_model.size(), 3u);

  observer()->ClearStates();
}

TEST_F(TabStripModelTest, AddToComparisonTable_EnabledForHttps) {
  std::unique_ptr<content::WebContents> https_web_contents =
      content::WebContentsTester::CreateTestWebContents(profile(), nullptr);
  content::WebContentsTester::For(https_web_contents.get())
      ->NavigateAndCommit(GURL("https://example.com"));

  tabstrip()->AppendWebContents(std::move(https_web_contents), true);
  ASSERT_TRUE(tabstrip()->IsContextMenuCommandEnabled(
      0, TabStripModel::CommandAddToNewComparisonTable));
  ASSERT_TRUE(tabstrip()->IsContextMenuCommandEnabled(
      0, TabStripModel::CommandAddToExistingComparisonTable));
}

TEST_F(TabStripModelTest, AddToComparisonTable_EnabledForHttp) {
  std::unique_ptr<content::WebContents> http_web_contents =
      content::WebContentsTester::CreateTestWebContents(profile(), nullptr);
  content::WebContentsTester::For(http_web_contents.get())
      ->NavigateAndCommit(GURL("http://example.com"));

  tabstrip()->AppendWebContents(std::move(http_web_contents), true);
  ASSERT_TRUE(tabstrip()->IsContextMenuCommandEnabled(
      0, TabStripModel::CommandAddToNewComparisonTable));
  ASSERT_TRUE(tabstrip()->IsContextMenuCommandEnabled(
      0, TabStripModel::CommandAddToExistingComparisonTable));
}

TEST_F(TabStripModelTest, AddToComparisonTable_DisabledForNonHttpOrHttps) {
  std::unique_ptr<content::WebContents> chrome_web_contents =
      content::WebContentsTester::CreateTestWebContents(profile(), nullptr);
  content::WebContentsTester::For(chrome_web_contents.get())
      ->NavigateAndCommit(GURL("chrome://abc"));

  tabstrip()->AppendWebContents(std::move(chrome_web_contents), true);
  ASSERT_FALSE(tabstrip()->IsContextMenuCommandEnabled(
      0, TabStripModel::CommandAddToNewComparisonTable));
  ASSERT_FALSE(tabstrip()->IsContextMenuCommandEnabled(
      0, TabStripModel::CommandAddToExistingComparisonTable));
}

TEST_F(TabStripModelTest, AddToComparisonTable_AddToNewTableOpensTab) {
  GURL url("https://example.com");

  std::unique_ptr<content::WebContents> web_contents =
      content::WebContentsTester::CreateTestWebContents(profile(), nullptr);
  content::WebContentsTester::For(web_contents.get())->NavigateAndCommit(url);
  tabstrip()->AppendWebContents(std::move(web_contents), true);

  tabstrip()->ExecuteContextMenuCommand(
      0, TabStripModel::CommandAddToNewComparisonTable);

  // New Compare tab with the URL should be opened and activated.
  ASSERT_TRUE(tabstrip()->count() == 2);
  ASSERT_TRUE(tabstrip()->GetActiveWebContents()->GetVisibleURL() ==
              commerce::GetProductSpecsTabUrl({url}));
}

TEST_F(TabStripModelTest, ExtendSelectionTo_SplitTabs) {

  // Create six tabs with a split containing tabs 0 and 1 and another split with
  // tabs 4 and 5.
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 6, 0, {0}));
  tabstrip()->ActivateTabAt(0);
  tabstrip()->AddToNewSplit({1}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);
  tabstrip()->ActivateTabAt(4);
  tabstrip()->AddToNewSplit({5}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);

  EXPECT_EQ("0s 1s 2 3 4s 5s", GetTabStripStateString(tabstrip()));

  // When active tab is part of a split, the selection should cover the split.
  tabstrip()->ActivateTabAt(1);
  tabstrip()->ExtendSelectionTo(2);
  ExpectSelectionIsExactly(tabstrip(), {0, 1, 2});

  // When index tab is part of a split and selection extends left, the selection
  // should cover the split.
  tabstrip()->ActivateTabAt(2);
  tabstrip()->ExtendSelectionTo(1);
  ExpectSelectionIsExactly(tabstrip(), {0, 1, 2});

  // When index tab is part of a split and selection extends right, the
  // selection should cover the split.
  tabstrip()->ActivateTabAt(3);
  tabstrip()->ExtendSelectionTo(4);
  ExpectSelectionIsExactly(tabstrip(), {3, 4, 5});
}

TEST_F(TabStripModelTest, ExtendSelectionTo_MultipleInDifferentDirection) {
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 5, 0, {2}));
  tabstrip()->ActivateTabAt(2);

  tabstrip()->ExtendSelectionTo(4);
  ExpectSelectionIsExactly(tabstrip(), {2, 3, 4});
  EXPECT_EQ(tabstrip()->active_index(), 4);

  tabstrip()->ExtendSelectionTo(0);
  ExpectSelectionIsExactly(tabstrip(), {0, 1, 2});
  EXPECT_EQ(tabstrip()->active_index(), 0);
}

TEST_F(TabStripModelTest, ExtendSelectionTo_MultipleInSameDirection) {
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 5, 0, {0}));
  tabstrip()->ActivateTabAt(0);

  tabstrip()->ExtendSelectionTo(1);
  ExpectSelectionIsExactly(tabstrip(), {0, 1});
  EXPECT_EQ(tabstrip()->active_index(), 1);

  tabstrip()->ExtendSelectionTo(2);
  ExpectSelectionIsExactly(tabstrip(), {0, 1, 2});
  EXPECT_EQ(tabstrip()->active_index(), 2);
}

TEST_F(TabStripModelTest, AddSelectionFromAnchorTo_SplitTabs) {

  // Create six tabs with a split containing tabs 0 and 1 and another split with
  // tabs 4 and 5.
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 6, 0, {0}));
  tabstrip()->ActivateTabAt(0);
  tabstrip()->AddToNewSplit({1}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);
  tabstrip()->ActivateTabAt(4);
  tabstrip()->AddToNewSplit({5}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);

  tabstrip()->ActivateTabAt(3);
  tabstrip()->AddSelectionFromAnchorTo(4);
  ExpectSelectionIsExactly(tabstrip(), {3, 4, 5});
  EXPECT_EQ(tabstrip()->active_index(), 4);

  tabstrip()->ActivateTabAt(2);
  tabstrip()->ExtendSelectionTo(1);
  ExpectSelectionIsExactly(tabstrip(), {0, 1, 2});
  EXPECT_EQ(tabstrip()->active_index(), 1);
}

TEST_F(TabStripModelTest,
       AddSelectionFromAnchorTo_MultipleInDifferentDirection) {
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 5, 0, {2}));
  tabstrip()->ActivateTabAt(2);

  tabstrip()->AddSelectionFromAnchorTo(4);
  ExpectSelectionIsExactly(tabstrip(), {2, 3, 4});
  EXPECT_EQ(tabstrip()->active_index(), 4);

  tabstrip()->AddSelectionFromAnchorTo(0);
  ExpectSelectionIsExactly(tabstrip(), {0, 1, 2, 3, 4});
  EXPECT_EQ(tabstrip()->active_index(), 0);
}

TEST_F(TabStripModelTest, AddSelectionFromAnchorTo_NoAnchorAndSplit) {

  // Create six tabs with a split containing tabs 0 and 1.
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 6, 0, {0}));
  tabstrip()->ActivateTabAt(0);
  tabstrip()->AddToNewSplit({1}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);

  ui::ListSelectionModel selection_model;
  selection_model.AddIndexToSelection(3);
  selection_model.set_anchor(std::nullopt);
  selection_model.set_active(3);
  tabstrip()->SetSelectionFromModel(selection_model);
  ExpectSelectionIsExactly(tabstrip(), {3});
  tabstrip()->AddSelectionFromAnchorTo(1);
  ExpectSelectionIsExactly(tabstrip(), {0, 1});
}

TEST_F(TabStripModelTest, SelectTabAt_SplitTabs) {

  // Create four tabs with a split containing tabs 2 and 3.
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 4, 0, {0}));
  tabstrip()->ActivateTabAt(3);
  tabstrip()->AddToNewSplit({2}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);

  EXPECT_EQ("0 1 2s 3s", GetTabStripStateString(tabstrip()));

  // When selected tab is part of a split, both tabs in the split are selected.
  tabstrip()->ActivateTabAt(1);
  tabstrip()->SelectTabAt(2);
  ExpectSelectionIsExactly(tabstrip(), {1, 2, 3});
}

TEST_F(TabStripModelTest, DeselectTabAt_SplitTabs) {

  // Create four tabs with a split containing tabs 2 and 3.
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 4, 0, {0}));
  tabstrip()->ActivateTabAt(3);
  tabstrip()->AddToNewSplit({2}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);

  EXPECT_EQ("0 1 2s 3s", GetTabStripStateString(tabstrip()));

  // When deselected tab is part of a split, both tabs in the split are
  // deselected.
  tabstrip()->ActivateTabAt(0);
  tabstrip()->SelectTabAt(2);
  tabstrip()->DeselectTabAt(2);
  ExpectSelectionIsExactly(tabstrip(), {0});
}

TEST_F(TabStripModelTest, DeselectTabAt_CantDeselectOnlySelectedSplitTabs) {

  // Create four tabs with a split containing tabs 2 and 3.
  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(tabstrip(), 4, 0, {0}));
  tabstrip()->ActivateTabAt(3);
  tabstrip()->AddToNewSplit({2}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);

  EXPECT_EQ("0 1 2s 3s", GetTabStripStateString(tabstrip()));

  // When deselected part of a split tab when no other tabs are selected,
  // nothing happens.
  tabstrip()->ActivateTabAt(2);
  tabstrip()->DeselectTabAt(2);
  ExpectSelectionIsExactly(tabstrip(), {2, 3});
}

TEST_F(TabStripModelTest, RemoveSplitInSelectionActivatesRemainingTab) {
  // Add 6 tabs to the tabstrip model. The first 4 tabs will be selected with
  // the tab at index 1 as the active tab. Tabs 1 and 2 are in a split view.
  PrepareTabs(tabstrip(), 6);
  ASSERT_EQ(6, tabstrip()->count());
  tabstrip()->ActivateTabAt(1);
  tabstrip()->AddToNewSplit({2}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);
  tabstrip()->ActivateTabAt(3);
  tabstrip()->SelectTabAt(0);
  tabstrip()->SelectTabAt(2);
  tabstrip()->SelectTabAt(1);

  // Verify the selection model before closing the tab.
  EXPECT_EQ(tabstrip()->active_index(), 1);
  ExpectSelectionIsExactly(tabstrip(), {0, 1, 2, 3});

  // Close the right half of the split tab.
  tabstrip()->CloseWebContentsAt(2, TabCloseTypes::CLOSE_NONE);

  // Verify that the other half of the split is active and 3 tabs are selected.
  EXPECT_EQ(tabstrip()->active_index(), 1);
  ExpectSelectionIsExactly(tabstrip(), {0, 1, 2});
}

TEST_F(TabStripModelTest, RemoveSplitUnselectsNonActiveTab) {
  // Add 4 tabs to the tabstrip model. Tabs 1 and 2 are in a split view and
  // active/selected.
  PrepareTabs(tabstrip(), 4);
  ASSERT_EQ(4, tabstrip()->count());
  tabstrip()->ActivateTabAt(1);
  split_tabs::SplitTabId split_tab_id = tabstrip()->AddToNewSplit(
      {2}, split_tabs::SplitTabVisualData(),
      split_tabs::SplitTabCreatedSource::kToolbarButton);

  // Verify the selection model before closing the tab.
  EXPECT_EQ(tabstrip()->active_index(), 1);
  ExpectSelectionIsExactly(tabstrip(), {1, 2});

  // Unsplit the tabs
  tabstrip()->RemoveSplit(split_tab_id);

  // Verify that only the active tab (1) is selected.
  EXPECT_EQ(tabstrip()->active_index(), 1);
  ExpectSelectionIsExactly(tabstrip(), {1});
}

TEST_F(TabStripModelTest, SplitSelectionTestFromModel) {
  TestTabStripModelDelegate delegate;
  TabStripModel tabstrip(&delegate, profile());
  EXPECT_TRUE(tabstrip.empty());

  ASSERT_NO_FATAL_FAILURE(
      PrepareTabstripForSelectionTest(&tabstrip, 10, 5, {2, 3, 6, 7}));

  tabstrip.ActivateTabAt(6,
                         TabStripUserGestureDetails(
                             TabStripUserGestureDetails::GestureType::kOther));

  tabstrip.AddToNewSplit({7}, split_tabs::SplitTabVisualData(),
                         split_tabs::SplitTabCreatedSource::kToolbarButton);

  tabstrip.ActivateTabAt(2,
                         TabStripUserGestureDetails(
                             TabStripUserGestureDetails::GestureType::kOther));
  tabstrip.AddToNewSplit({1}, split_tabs::SplitTabVisualData(),
                         split_tabs::SplitTabCreatedSource::kToolbarButton);

  // Pass in only one of the selected tabs in the splits.
  PrepareTabstripForSelectionTest(&tabstrip, 0, 0, {6, 2});
  ui::ListSelectionModel::SelectedIndices expected_sel_indices;
  expected_sel_indices.insert(6);
  expected_sel_indices.insert(7);
  expected_sel_indices.insert(1);
  expected_sel_indices.insert(2);

  EXPECT_EQ(tabstrip.selection_model().selected_indices(),
            expected_sel_indices);
}

TEST_F(TabStripModelTest, RemoveLeftTabInSplitActivatesRemainingTab) {
  // Add 4 tabs to the tabstrip model. Tabs 0 and 1 are in a split view.
  PrepareTabs(tabstrip(), 4);
  ASSERT_EQ(4, tabstrip()->count());
  tabstrip()->ActivateTabAt(0);
  tabstrip()->AddToNewSplit({1}, split_tabs::SplitTabVisualData(),
                            split_tabs::SplitTabCreatedSource::kToolbarButton);

  // Verify the selection model before closing the tab.
  EXPECT_EQ("0s 1s 2 3", GetTabStripStateString(tabstrip()));
  EXPECT_EQ(tabstrip()->active_index(), 0);
  ExpectSelectionIsExactly(tabstrip(), {0, 1});

  // Close the left half of the split tab.
  tabstrip()->CloseWebContentsAt(0, TabCloseTypes::CLOSE_NONE);

  // Verify that the other half of the split is now active.
  EXPECT_EQ(tabstrip()->active_index(), 0);
  ExpectSelectionIsExactly(tabstrip(), {0});
}

TEST_F(TabStripModelTest, IteratorTest) {
  // Get the iterator without any tabs being present.
  TabStripModel::TabIterator it = tabstrip()->begin();
  EXPECT_EQ(*it, nullptr);
  EXPECT_EQ(it, tabstrip()->end());

  // Add only one unpinned tab
  PrepareTabstripForSelectionTest(tabstrip(), 1, 0, {0});
  it = tabstrip()->begin();
  EXPECT_EQ(*it, tabstrip()->GetTabAtIndex(0));
  EXPECT_EQ(++it, tabstrip()->end());

  // Add 4 tabs to the tabstrip model. Tabs 0 and 1 are in a split view.
  PrepareTabstripForSelectionTest(tabstrip(), 50, 10, {0});

  tabstrip()->AddToNewGroup({15, 16});
  tabstrip()->AddToNewGroup({25, 26});
  tabstrip()->AddToNewGroup({40});

  it = tabstrip()->begin();
  int i = 0;
  while (it != tabstrip()->end()) {
    EXPECT_EQ(*it, tabstrip()->GetTabAtIndex(i++));
    it++;
  }
  EXPECT_EQ(i, tabstrip()->count());
}

TEST_F(TabStripModelTest, IteratorTestPinnedTab) {
  // Add only one unpinned tab
  PrepareTabstripForSelectionTest(tabstrip(), 10, 10, {0});

  TabStripModel::TabIterator it = tabstrip()->begin();
  int i = 0;
  while (it != tabstrip()->end()) {
    EXPECT_EQ(*it, tabstrip()->GetTabAtIndex(i++));
    it++;
  }
  EXPECT_EQ(i, tabstrip()->count());
}

TEST_F(TabStripModelTest, IteratorTestGroupOnlyTabs) {
  // Add only one unpinned tab
  PrepareTabstripForSelectionTest(tabstrip(), 5, 0, {0});
  tabstrip()->AddToNewGroup({0, 1, 2, 3, 4});

  TabStripModel::TabIterator it = tabstrip()->begin();
  int i = 0;
  while (it != tabstrip()->end()) {
    EXPECT_EQ(*it, tabstrip()->GetTabAtIndex(i++));
    it++;
  }
  EXPECT_EQ(i, tabstrip()->count());
}

// A TestTabStripModelDelegate that allows controlling when the group
// destruction callback is run.
class CallbackControllingTabStripModelDelegate
    : public TestTabStripModelDelegate {
 public:
  CallbackControllingTabStripModelDelegate() = default;

  void OnGroupsDestruction(const std::vector<tab_groups::TabGroupId>& group_ids,
                           base::OnceCallback<void()> close_callback,
                           bool delete_groups) override {
    callback_ = std::move(close_callback);
  }

  void RunCallback() {
    if (callback_) {
      std::move(callback_).Run();
    }
  }

 private:
  base::OnceCallback<void()> callback_;
};

class TabStripModelCallbackTest : public testing::Test {
 public:
  TabStripModelCallbackTest()
      : profile_(std::make_unique<TestingProfile>()),
        delegate_(
            std::make_unique<CallbackControllingTabStripModelDelegate>()) {
    ON_CALL(bwi_, GetTabStripModel())
        .WillByDefault(::testing::Return(tabstrip_.get()));
    ON_CALL(bwi_, GetProfile())
        .WillByDefault(::testing::Return(profile_.get()));
    delegate_->SetBrowserWindowInterface(&bwi_);
    tabstrip_ =
        std::make_unique<TabStripModel>(delegate_.get(), profile_.get());
  }

  std::unique_ptr<content::WebContents> CreateWebContents() {
    return content::WebContentsTester::CreateTestWebContents(profile_.get(),
                                                             nullptr);
  }

  TabStripModel* tabstrip() { return tabstrip_.get(); }
  CallbackControllingTabStripModelDelegate* delegate() {
    return delegate_.get();
  }

 private:
  content::BrowserTaskEnvironment task_environment_;
  content::RenderViewHostTestEnabler rvh_test_enabler_;
  std::unique_ptr<TestingProfile> profile_;
  testing::NiceMock<MockBrowserWindowInterface> bwi_;
  std::unique_ptr<CallbackControllingTabStripModelDelegate> delegate_;
  const tabs::TabModel::PreventFeatureInitializationForTesting prevent_;
  std::unique_ptr<TabStripModel> tabstrip_;
};

// Tests that if a group or tab is removed before a command is executed, the
// A tab from a group is moved to a new group, but the tab is closed before the
// move is complete.
TEST_F(TabStripModelCallbackTest, MoveTabToNewGroupThenCloseTab) {
  tabstrip()->AppendWebContents(CreateWebContents(), true);
  tabstrip()->AddToNewGroup({0});
  tabstrip()->SelectTabAt(0);
  tabstrip()->ExecuteContextMenuCommand(
      0, TabStripModel::CommandAddToNewGroupFromMenuItem);
  tabstrip()->CloseWebContentsAt(0, TabCloseTypes::CLOSE_NONE);
  delegate()->RunCallback();
  EXPECT_EQ(tabstrip()->group_model()->ListTabGroups().size(), 0u);
  tabstrip()->CloseAllTabs();
}

// A tab from a group is moved to another group, but the tab is closed before
// the move is complete.
TEST_F(TabStripModelCallbackTest, MoveTabToExistingGroupThenCloseTab) {
  tabstrip()->AppendWebContents(CreateWebContents(), true);
  tabstrip()->AppendWebContents(CreateWebContents(), true);
  tabstrip()->AddToNewGroup({0});
  tab_groups::TabGroupId group2_id = tabstrip()->AddToNewGroup({1});
  tabstrip()->SelectTabAt(0);
  tabstrip()->ExecuteAddToExistingGroupCommand(0, group2_id);
  tabstrip()->CloseWebContentsAt(0, TabCloseTypes::CLOSE_NONE);
  delegate()->RunCallback();
  EXPECT_EQ(
      tabstrip()->group_model()->GetTabGroup(group2_id)->ListTabs().length(),
      1u);
  tabstrip()->CloseAllTabs();
}

// A tab is moved to a group, but the group is deleted before the move is
// complete.
TEST_F(TabStripModelCallbackTest, MoveTabToGroupThenDeleteGroup) {
  tabstrip()->AppendWebContents(CreateWebContents(), true);
  tabstrip()->AppendWebContents(CreateWebContents(), true);
  tabstrip()->AddToNewGroup({0});
  tab_groups::TabGroupId group2_id = tabstrip()->AddToNewGroup({1});
  tabstrip()->SelectTabAt(0);
  tabstrip()->ExecuteAddToExistingGroupCommand(0, group2_id);
  tabstrip()->CloseAllTabsInGroup(group2_id);
  delegate()->RunCallback();
  EXPECT_EQ(tabstrip()->group_model()->ListTabGroups().size(), 0u);
  tabstrip()->CloseAllTabs();
}