Default to current UI locale when recommended locales are invalid

chrome/browser/ui/webui/chromeos/login/l10n_util_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/ui/webui/chromeos/login/l10n_util.h"
 
 #include "base/at_exit.h"
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
@@ skipping 111 matching lines @@
 
 TEST_F(L10nUtilTest, GetUILanguageList) {
   SetInputMethods1();
 
   // This requires initialized StatisticsProvider (see L10nUtilTest()).
   scoped_ptr<base::ListValue> list(GetUILanguageList(NULL, std::string()));
 
   VerifyOnlyUILanguages(*list);
 }
 
+TEST_F(L10nUtilTest, FindMostRelevantLocale) {
+  base::ListValue available_locales;
+  scoped_ptr<base::DictionaryValue> dict(new base::DictionaryValue);
+  dict->SetString("value", "de");
+  available_locales.Append(dict.release());
+  dict.reset(new base::DictionaryValue);
+  dict->SetString("value", "fr");
+  available_locales.Append(dict.release());
+  dict.reset(new base::DictionaryValue);
+  dict->SetString("value", "en-GB");
+  available_locales.Append(dict.release());
+
+  std::vector<std::string> most_relevant_language_codes;
+  EXPECT_EQ("en-US", FindMostRelevantLocale(most_relevant_language_codes,
+                                            available_locales,
+                                            "en-US"));
+
+  most_relevant_language_codes.push_back("xx");
+  EXPECT_EQ("en-US", FindMostRelevantLocale(most_relevant_language_codes,
+                                            available_locales,
+                                            "en-US"));
+
+  most_relevant_language_codes.push_back("fr");
+  EXPECT_EQ("fr", FindMostRelevantLocale(most_relevant_language_codes,
+                                         available_locales,
+                                         "en-US"));
+
+  most_relevant_language_codes.push_back("de");
+  EXPECT_EQ("fr", FindMostRelevantLocale(most_relevant_language_codes,
+                                         available_locales,
+                                         "en-US"));
+}
+
 void InitStartupCustomizationDocumentForTesting(const std::string& manifest) {
   StartupCustomizationDocument::GetInstance()->LoadManifestFromString(manifest);
   StartupCustomizationDocument::GetInstance()->Init(
       chromeos::system::StatisticsProvider::GetInstance());
 }
 
 const char kStartupManifest[] =
     "{\n"
     "  \"version\": \"1.0\",\n"
     "  \"initial_locale\" : \"fr,en-US,de,is,it\",\n"
@@ skipping 40 matching lines @@
   VerifyOnlyUILanguages(*list);
 
   ASSERT_LE(3u, list->GetSize());
 
   VerifyLanguageCode(*list, 0, "it");
   VerifyLanguageCode(*list, 1, "de");
   VerifyLanguageCode(*list, 2, kMostRelevantLanguagesDivider);
 }
 
 }  // namespace chromeos