RenderText: Add a test to ensure strings fit their own widths

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 2291 matching lines @@
   run.glyph_count = 0;
   EXPECT_EQ(Range(0, 0), run.CharRangeToGlyphRange(Range(4, 5)));
   EXPECT_EQ(Range(0, 0), run.GetGraphemeBounds(iter.get(), 4));
   Range chars;
   Range glyphs;
   run.GetClusterAt(4, &chars, &glyphs);
   EXPECT_EQ(Range(3, 8), chars);
   EXPECT_EQ(Range(0, 0), glyphs);
 }
 
+// Ensure a string fits in a display rect with a width equal to the string's.
+TEST_F(RenderTextTest, StringFitsOwnWidth) {
+  scoped_ptr<RenderText> render_text(RenderText::CreateInstance());
+  const base::string16 kString = ASCIIToUTF16("www.example.com");
+
+  render_text->SetText(kString);
+  render_text->ApplyStyle(BOLD, true, Range(0, 3));
+  render_text->SetElideBehavior(ELIDE_TAIL);
+
+  render_text->SetDisplayRect(Rect(0, 0, 500, 100));
+  EXPECT_EQ(kString, render_text->GetLayoutText());
+  render_text->SetDisplayRect(Rect(0, 0, render_text->GetContentWidth(), 100));
+  EXPECT_EQ(kString, render_text->GetLayoutText());
+}
+
 }  // namespace gfx