[RenderText] added test for AppendText

ui/gfx/render_text_unittest.cc

 // Copyright (c) 2012 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 "ui/gfx/render_text.h"
 
 #include <algorithm>
 
 #include "base/format_macros.h"
 #include "base/i18n/break_iterator.h"
@@ skipping 334 matching lines @@
   render_text->ApplyStyle(UNDERLINE, true, Range(2, 5));
   std::vector<std::pair<size_t, bool> > expected_underline;
   expected_underline.push_back(std::pair<size_t, bool>(0, false));
   expected_underline.push_back(std::pair<size_t, bool>(1, true));
   expected_underline.push_back(std::pair<size_t, bool>(6, false));
   EXPECT_TRUE(render_text->styles()[UNDERLINE].EqualsForTesting(
       expected_underline));
 #endif  // OS_MACOSX
 }
 
+TEST_F(RenderTextTest, AppendTextKeepsStyles) {
+  scoped_ptr<RenderText> render_text(RenderText::CreateInstance());
+  // Setup basic functionality.
+  render_text->SetText(ASCIIToUTF16("abc"));
+  render_text->ApplyColor(SK_ColorRED, Range(0, 1));
+  render_text->ApplyBaselineStyle(SUPERSCRIPT, Range(1, 2));
+  render_text->ApplyStyle(UNDERLINE, true, Range(2, 3));
+  // Verify basic functionality.
+  std::vector<std::pair<size_t, SkColor>> expected_color;
+  expected_color.push_back(std::pair<size_t, SkColor>(0, SK_ColorRED));
+  expected_color.push_back(std::pair<size_t, SkColor>(1, SK_ColorBLACK));
+  EXPECT_TRUE(render_text->colors().EqualsForTesting(expected_color));
+  std::vector<std::pair<size_t, BaselineStyle>> expected_baseline;
+  expected_baseline.push_back(
+      std::pair<size_t, BaselineStyle>(0, NORMAL_BASELINE));
+  expected_baseline.push_back(std::pair<size_t, BaselineStyle>(1, SUPERSCRIPT));
+  expected_baseline.push_back(
+      std::pair<size_t, BaselineStyle>(2, NORMAL_BASELINE));
+  EXPECT_TRUE(render_text->baselines().EqualsForTesting(expected_baseline));
+  std::vector<std::pair<size_t, bool>> expected_style;
+  expected_style.push_back(std::pair<size_t, bool>(0, false));
+  expected_style.push_back(std::pair<size_t, bool>(2, true));
+  EXPECT_TRUE(
+      render_text->styles()[UNDERLINE].EqualsForTesting(expected_style));
+  // Ensure AppendText maintains current text styles.
+  render_text->AppendText(ASCIIToUTF16("def"));
+  EXPECT_EQ(render_text->GetDisplayText(), ASCIIToUTF16("abcdef"));
+  EXPECT_TRUE(render_text->colors().EqualsForTesting(expected_color));
+  EXPECT_TRUE(render_text->baselines().EqualsForTesting(expected_baseline));
+  EXPECT_TRUE(
+      render_text->styles()[UNDERLINE].EqualsForTesting(expected_style));
+}
+
 // TODO(asvitkine): Cursor movements tests disabled on Mac because RenderTextMac
 //                  does not implement this yet. http://crbug.com/131618
 #if !defined(OS_MACOSX)
 void TestVisualCursorMotionInObscuredField(RenderText* render_text,
                                            const base::string16& text,
                                            bool select) {
   ASSERT_TRUE(render_text->obscured());
   render_text->SetText(text);
   int len = text.length();
   render_text->MoveCursor(LINE_BREAK, CURSOR_RIGHT, select);
@@ skipping 2457 matching lines @@
   string_size.set_width(string_size.width() / 2);
   render_text.SetDisplayRect(gfx::Rect(string_size));
   render_text.EnsureLayout();
   CFIndex glyph_count = CTLineGetGlyphCount(render_text.line_);
   EXPECT_GT(text.size(), static_cast<size_t>(glyph_count));
   EXPECT_NE(0, glyph_count);
 }
 #endif
 
 }  // namespace gfx