chromium/src/third_party/blink/renderer/core/dom/first_letter_pseudo_element_test.cc

// Copyright 2017 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 "third_party/blink/renderer/core/dom/first_letter_pseudo_element.h"

#include "third_party/blink/renderer/core/testing/page_test_base.h"

namespace blink {

class FirstLetterPseudoElementTest : public PageTestBase {};

TEST_F(FirstLetterPseudoElementTest, DoesNotBreakEmoji) {
  const UChar emoji[] = {0xD83D, 0xDE31, 0};
  EXPECT_EQ(2u, FirstLetterPseudoElement::FirstLetterLength(emoji));
}

// http://crbug.com/1161370
TEST_F(FirstLetterPseudoElementTest, EmptySpanOnly) {
  InsertStyleElement("p::first-letter { color: red; }");
  SetBodyContent("<div><p id=sample><b></b></p>abc</div>");
  Element& sample = *GetElementById("sample");
  // Call Element::RebuildFirstLetterLayoutTree()
  sample.setAttribute(html_names::kContenteditableAttr, "true");
  const PseudoElement* const first_letter =
      sample.GetPseudoElement(kPseudoIdFirstLetter);
  // We should not have ::first-letter pseudo element because <p> has no text.
  // See |FirstLetterPseudoElement::FirstLetterTextLayoutObject()| should
  // return nullptr during rebuilding layout tree.
  EXPECT_FALSE(first_letter);
}

TEST_F(FirstLetterPseudoElementTest, UnicodePairBreaking) {
  const UChar test_string[] = {0xD800, 0xDD00, 'A', 0xD800, 0xDD00,
                               0xD800, 0xDD00, 'B', 0};
  EXPECT_EQ(7u, FirstLetterPseudoElement::FirstLetterLength(test_string));
}

}  // namespace blink