Support multiple locales string for accept language list

chrome/browser/android/preferences/pref_service_bridge_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 "chrome/browser/android/preferences/pref_service_bridge.h"
 
 #include <string>
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 
 // A test class for PrefServiceBridge class.
 class PrefServiceBridgeTest : public testing::Test {
  public:
   std::string GetAcceptLanguages(std::string locale,
                                  std::string accept_languages) {
     PrefServiceBridge::PrependToAcceptLanguagesIfNecessary(locale,
                                                            &accept_languages);
     return accept_languages;
   }
 };
 
 TEST_F(PrefServiceBridgeTest, PrependToAcceptLanguagesAsNecessary) {
   EXPECT_EQ("ms-MY,ms,en-US,en", GetAcceptLanguages("ms_MY", "en-US,en"));
+  EXPECT_EQ("de-CH,de,zh-TW,zh,en-US,en",
+            GetAcceptLanguages("de_CH,zh_TW", "en-US,en"));
+  EXPECT_EQ("de-CH,de,zh-TW,zh,fr-FR,fr,en-US,en",
+            GetAcceptLanguages("de_CH,zh_TW,fr_FR", "en-US,en"));
 
+  // Make sure we do not prepend language code even when a language code already
+  // exists.
+  EXPECT_EQ("zh-TW,zh-CN,zh", GetAcceptLanguages("zh_TW", "zh-CN,zh"));
   EXPECT_EQ("de-CH,de-DE,de,en-US,en",
-      GetAcceptLanguages("de_CH", "de-DE,de,en-US,en"));
+            GetAcceptLanguages("de_CH", "de-DE,de,en-US,en"));
+  EXPECT_EQ("en-GB,de-DE,de,en-US,en",
+            GetAcceptLanguages("en_GB,de_DE", "en-US,en"));
 
-  // Make sure we do not prepend language code even when a language code is at
-  // the end.
-  EXPECT_EQ("zh-TW,zh-CN,zh", GetAcceptLanguages("zh_TW", "zh-CN,zh"));
+  // Make sure a language code is only inserted after the last languageTag that
+  // contains that language.
+  EXPECT_EQ("fr-CA,fr-FR,fr,en-US,en",
+            GetAcceptLanguages("fr_CA,fr_FR", "en-US,en"));
 }
 
 TEST_F(PrefServiceBridgeTest,
        ShouldNotPrependToAcceptLanguagesWhenNotNecessary) {
   // Java has some deprecated two letter language code. For instance, "iw" is
   // an old code that needs to be replaced by "he" which is the new code for
   // Hebrew.
   EXPECT_EQ("he-IL,he,en-US,en",
       GetAcceptLanguages("iw_IL", "he-IL,he,en-US,en"));
+  EXPECT_EQ("he-IL,he,fr-FR,fr,en-US,en",
+            GetAcceptLanguages("iw_IL,fr_FR", "en-US,en"));
 
   // This logic should not affect cases where original accept language already
   // reflects the language code in the locale.
   EXPECT_EQ("en-US,en", GetAcceptLanguages("en_US", "en-US,en"));
   EXPECT_EQ("zh-CN,zh", GetAcceptLanguages("zh_CN", "zh-CN,zh"));
+  EXPECT_EQ("ms-MY,ms,en-US,en", GetAcceptLanguages("ms_MY,en_US", "en-US,en"));
 
   // "ms" is not expected. No replacement takes place.
   EXPECT_EQ("en-US,en", GetAcceptLanguages("ms", "en-US,en"));
 }