linux: Add some font-family-related FontRenderParams tests.

ui/gfx/font_render_params_linux_unittest.cc

 // Copyright 2014 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/font_render_params.h"
 
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/logging.h"
 #include "base/macros.h"
@@ skipping 269 matching lines @@
   std::string suggested_family;
   FontRenderParams params = GetFontRenderParams(query, &suggested_family);
 
   // The system params and the first requested family should be returned.
   EXPECT_EQ(system_params.antialiasing, params.antialiasing);
   EXPECT_EQ(system_params.hinting, params.hinting);
   EXPECT_EQ(system_params.subpixel_rendering, params.subpixel_rendering);
   EXPECT_EQ(query.families[0], suggested_family);
 }
 
+TEST_F(FontRenderParamsTest, MissingFamily) {
+  // With Arial and Verdana installed, request (in order) Helvetica, Arial, and
+  // Verdana and check that Arial is returned.
+  ASSERT_TRUE(LoadSystemFont("arial.ttf"));
+  ASSERT_TRUE(LoadSystemFont("verdana.ttf"));
+  FontRenderParamsQuery query(false);
+  query.families.push_back("Helvetica");
+  query.families.push_back("Arial");
+  query.families.push_back("Verdana");
+  std::string suggested_family;
+  GetFontRenderParams(query, &suggested_family);
+  EXPECT_EQ("Arial", suggested_family);
+}
+
+TEST_F(FontRenderParamsTest, SubstituteFamily) {
+  // Configure Fontconfig to use Verdana for both Helvetica and Arial.
+  ASSERT_TRUE(LoadSystemFont("arial.ttf"));
+  ASSERT_TRUE(LoadSystemFont("verdana.ttf"));
+  ASSERT_TRUE(LoadConfigDataIntoFontconfig(temp_dir_.path(),
+      std::string(kFontconfigFileHeader) +
+      CreateFontconfigAliasStanza("Helvetica", "Verdana") +
+      kFontconfigMatchHeader +
+      CreateFontconfigTestStanza("family", "eq", "string", "Arial") +
+      CreateFontconfigEditStanza("family", "string", "Verdana") +
+      kFontconfigMatchFooter +
+      kFontconfigFileFooter));
+
+  FontRenderParamsQuery query(false);
+  query.families.push_back("Helvetica");
+  std::string suggested_family;
+  GetFontRenderParams(query, &suggested_family);
+  EXPECT_EQ("Verdana", suggested_family);
+
+  query.families.clear();
+  query.families.push_back("Arial");
+  suggested_family.clear();
+  GetFontRenderParams(query, &suggested_family);
+  EXPECT_EQ("Verdana", suggested_family);
+}
+
 }  // namespace gfx