chromecast/media/base/media_resource_tracker_unittest.cc

// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "chromecast/media/base/media_resource_tracker.h"

#include <memory>

#include "base/bind.h"
#include "base/message_loop/message_loop.h"
#include "base/run_loop.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace chromecast {
namespace media {

// Collection of mocks to verify MediaResourceTracker takes the correct actions.
class MediaResourceTrackerTestMocks {
 public:
  MOCK_METHOD0(Initialize, void());  // CastMediaShlib::Initialize
  MOCK_METHOD0(Finalize, void());  // CastMediaShlib::Finalize
  MOCK_METHOD0(Destroyed, void());  // ~CastMediaResourceTracker
  MOCK_METHOD0(FinalizeCallback, void());  // callback to Finalize
};

class TestMediaResourceTracker : public MediaResourceTracker {
 public:
  TestMediaResourceTracker(
      MediaResourceTrackerTestMocks* test_mocks,
      const scoped_refptr<base::SingleThreadTaskRunner>& ui_task_runner,
      const scoped_refptr<base::SingleThreadTaskRunner>& media_task_runner)
      : MediaResourceTracker(ui_task_runner, media_task_runner),
        test_mocks_(test_mocks) {}
  ~TestMediaResourceTracker() override {
    EXPECT_TRUE(ui_task_runner_->BelongsToCurrentThread());
    test_mocks_->Destroyed();
  }

  void DoInitializeMediaLib() override {
    ASSERT_TRUE(media_task_runner_->BelongsToCurrentThread());
    test_mocks_->Initialize();
  }
  void DoFinalizeMediaLib() override {
    ASSERT_TRUE(media_task_runner_->BelongsToCurrentThread());
    test_mocks_->Finalize();
  }

  size_t media_use_count() const { return media_use_count_; }

 private:
  MediaResourceTrackerTestMocks* test_mocks_;
};

class MediaResourceTrackerTest : public ::testing::Test {
 public:
  MediaResourceTrackerTest() {}
  ~MediaResourceTrackerTest() override {}

 protected:
  void SetUp() override {
    test_mocks_.reset(new MediaResourceTrackerTestMocks());

    resource_tracker_ = new TestMediaResourceTracker(
        test_mocks_.get(), message_loop_.task_runner(),
        message_loop_.task_runner());
  }

  void InitializeMediaLib() {
    EXPECT_CALL(*test_mocks_, Initialize()).Times(1);
    resource_tracker_->InitializeMediaLib();
    base::RunLoop().RunUntilIdle();
  }

  base::MessageLoop message_loop_;
  TestMediaResourceTracker* resource_tracker_;
  std::unique_ptr<MediaResourceTrackerTestMocks> test_mocks_;

  DISALLOW_COPY_AND_ASSIGN(MediaResourceTrackerTest);
};

TEST_F(MediaResourceTrackerTest, BasicLifecycle) {
  // Startup and shutdown flow: Initialize then FinalizeAndDestroy
  EXPECT_CALL(*test_mocks_, Initialize()).Times(1);
  EXPECT_CALL(*test_mocks_, Finalize()).Times(1);
  EXPECT_CALL(*test_mocks_, Destroyed()).Times(1);

  resource_tracker_->InitializeMediaLib();
  resource_tracker_->FinalizeAndDestroy();
  base::RunLoop().RunUntilIdle();
}

TEST_F(MediaResourceTrackerTest, InitializeTwice) {
  EXPECT_CALL(*test_mocks_, Initialize()).Times(1);
  EXPECT_CALL(*test_mocks_, Finalize()).Times(1);
  EXPECT_CALL(*test_mocks_, Destroyed()).Times(1);

  resource_tracker_->InitializeMediaLib();
  resource_tracker_->InitializeMediaLib();
  resource_tracker_->FinalizeAndDestroy();
  base::RunLoop().RunUntilIdle();
}

TEST_F(MediaResourceTrackerTest, FinalizeWithoutInitialize) {
  EXPECT_CALL(*test_mocks_, Initialize()).Times(0);
  EXPECT_CALL(*test_mocks_, Finalize()).Times(0);
  EXPECT_CALL(*test_mocks_, Destroyed()).Times(1);

  resource_tracker_->FinalizeAndDestroy();
  base::RunLoop().RunUntilIdle();
}

// Check FinalizeCastMediaShlib works correctly with no users of
// media resource.
TEST_F(MediaResourceTrackerTest, FinalizeResourceNotInUse) {
  InitializeMediaLib();

  EXPECT_CALL(*test_mocks_, Finalize()).Times(1);
  EXPECT_CALL(*test_mocks_, Destroyed()).Times(0);
  EXPECT_CALL(*test_mocks_, FinalizeCallback()).Times(1);
  resource_tracker_->FinalizeMediaLib(
      base::Bind(&MediaResourceTrackerTestMocks::FinalizeCallback,
                 base::Unretained(test_mocks_.get())));
  base::RunLoop().RunUntilIdle();

  EXPECT_CALL(*test_mocks_, Destroyed()).Times(1);
  resource_tracker_->FinalizeAndDestroy();
  base::RunLoop().RunUntilIdle();
}

// Check FinalizeCastMediaShlib waits for resource to not be in use.
TEST_F(MediaResourceTrackerTest, FinalizeResourceInUse) {
  InitializeMediaLib();

  resource_tracker_->IncrementUsageCount();
  base::RunLoop().RunUntilIdle();

  EXPECT_CALL(*test_mocks_, Finalize()).Times(0);
  EXPECT_CALL(*test_mocks_, Destroyed()).Times(0);
  resource_tracker_->FinalizeMediaLib(
      base::Bind(&MediaResourceTrackerTestMocks::FinalizeCallback,
                 base::Unretained(test_mocks_.get())));
  base::RunLoop().RunUntilIdle();

  EXPECT_CALL(*test_mocks_, Finalize()).Times(1);
  EXPECT_CALL(*test_mocks_, FinalizeCallback()).Times(1);
  resource_tracker_->DecrementUsageCount();
  base::RunLoop().RunUntilIdle();

  EXPECT_CALL(*test_mocks_, Destroyed()).Times(1);
  resource_tracker_->FinalizeAndDestroy();
  base::RunLoop().RunUntilIdle();
}

// Check FinalizeAndDestroy waits for resource to not be in use.
TEST_F(MediaResourceTrackerTest, DestroyWaitForNoUsers) {
  InitializeMediaLib();

  resource_tracker_->IncrementUsageCount();
  base::RunLoop().RunUntilIdle();

  EXPECT_CALL(*test_mocks_, Finalize()).Times(0);
  EXPECT_CALL(*test_mocks_, Destroyed()).Times(0);
  resource_tracker_->FinalizeAndDestroy();
  base::RunLoop().RunUntilIdle();

  EXPECT_CALL(*test_mocks_, Finalize()).Times(1);
  EXPECT_CALL(*test_mocks_, Destroyed()).Times(1);
  resource_tracker_->DecrementUsageCount();
  base::RunLoop().RunUntilIdle();
}

// Check finalize callback still made if FinalizeAndDestroy called
// while waiting for resource usage to end.
TEST_F(MediaResourceTrackerTest, DestroyWithPendingFinalize) {
  InitializeMediaLib();

  resource_tracker_->IncrementUsageCount();
  base::RunLoop().RunUntilIdle();

  EXPECT_CALL(*test_mocks_, Finalize()).Times(0);
  EXPECT_CALL(*test_mocks_, Destroyed()).Times(0);
  resource_tracker_->FinalizeMediaLib(
      base::Bind(&MediaResourceTrackerTestMocks::FinalizeCallback,
                 base::Unretained(test_mocks_.get())));
  resource_tracker_->FinalizeAndDestroy();
  base::RunLoop().RunUntilIdle();

  EXPECT_CALL(*test_mocks_, Finalize()).Times(1);
  EXPECT_CALL(*test_mocks_, Destroyed()).Times(1);
  EXPECT_CALL(*test_mocks_, FinalizeCallback()).Times(1);
  resource_tracker_->DecrementUsageCount();
  base::RunLoop().RunUntilIdle();
}

TEST_F(MediaResourceTrackerTest, ScopedUsage) {
  InitializeMediaLib();

  EXPECT_EQ(0u, resource_tracker_->media_use_count());
  {
    std::unique_ptr<MediaResourceTracker::ScopedUsage> scoped_usage(
        new MediaResourceTracker::ScopedUsage(resource_tracker_));
    EXPECT_EQ(1u, resource_tracker_->media_use_count());
  }
  EXPECT_EQ(0u, resource_tracker_->media_use_count());

  resource_tracker_->FinalizeAndDestroy();
  base::RunLoop().RunUntilIdle();
}

}  // namespace media
}  // namespace chromecast