third_party/blink/renderer/core/css/style_scope_test.cc

// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "third_party/blink/renderer/core/css/style_scope.h"

#include "third_party/blink/renderer/core/css/css_test_helpers.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/testing/page_test_base.h"
#include "third_party/blink/renderer/platform/testing/runtime_enabled_features_test_helpers.h"

namespace blink {

class StyleScopeTest : public PageTestBase, private ScopedCSSScopeForTest {
 public:
  StyleScopeTest() : ScopedCSSScopeForTest(true) {}

  String ToString(const CSSSelector* selector_list) {
    if (!selector_list) {
      return "";
    }
    return CSSSelectorList::SelectorsText(selector_list);
  }
};

TEST_F(StyleScopeTest, Copy) {
  auto* rule = css_test_helpers::ParseRule(GetDocument(), R"CSS(
        @scope (.x) to (.y) {
          #target { z-index: 1; }
        }
      )CSS");
  ASSERT_TRUE(rule);
  auto& scope_rule = To<StyleRuleScope>(*rule);
  const StyleScope& a = scope_rule.GetStyleScope();
  const StyleScope& b = *MakeGarbageCollected<StyleScope>(a);

  EXPECT_FALSE(a.IsImplicit());
  EXPECT_FALSE(b.IsImplicit());

  EXPECT_EQ(ToString(a.From()), ToString(b.From()));
  EXPECT_EQ(ToString(a.To()), ToString(b.To()));
}

TEST_F(StyleScopeTest, CopyImplicit) {
  auto* rule = css_test_helpers::ParseRule(GetDocument(), R"CSS(
        @scope {
          #target { z-index: 1; }
        }
      )CSS");
  ASSERT_TRUE(rule);
  auto& scope_rule = To<StyleRuleScope>(*rule);
  const StyleScope& a = scope_rule.GetStyleScope();
  const StyleScope& b = *MakeGarbageCollected<StyleScope>(a);

  // Mostly just don't crash.
  EXPECT_TRUE(a.IsImplicit());
  EXPECT_TRUE(b.IsImplicit());

  EXPECT_EQ(ToString(a.From()), ToString(b.From()));
  EXPECT_EQ(ToString(a.To()), ToString(b.To()));
}

TEST_F(StyleScopeTest, CopyParent) {
  auto* rule = css_test_helpers::ParseRule(GetDocument(), R"CSS(
        @scope (.x) {
          #target { z-index: 1; }
        }
      )CSS");
  ASSERT_TRUE(rule);
  auto& scope_rule = To<StyleRuleScope>(*rule);

  const StyleScope& a = scope_rule.GetStyleScope();
  const StyleScope& b = *MakeGarbageCollected<StyleScope>(a);

  const StyleScope& c = *b.CopyWithParent(&b);
  const StyleScope& d = *MakeGarbageCollected<StyleScope>(c);

  EXPECT_FALSE(a.Parent());
  EXPECT_FALSE(b.Parent());
  EXPECT_EQ(&b, c.Parent());
  EXPECT_EQ(&b, d.Parent());
}

}  // namespace blink