Translate: split language code typo correction to apply unit tests.

chrome/renderer/translate_helper_unittest.cc

 // Copyright (c) 2013 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/renderer/translate_helper.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 typedef testing::Test TranslateHelperTest;
 
+// Tests that well-known language code typos are fixed.
+TEST_F(TranslateHelperTest, LanguageCodeTypoCorrection) {
+  std::string language;
+
+  // Strip the second and later codes.
+  language = std::string("ja,en");
+  TranslateHelper::CorrectLanguageCodeTypo(&language);
+  EXPECT_EQ("ja", language);
+
+  // Replace dash with hyphen.
+  language = std::string("ja_JP");
+  TranslateHelper::CorrectLanguageCodeTypo(&language);
+  EXPECT_EQ("ja-JP", language);
+
+  // Correct wrong cases.
+  language = std::string("JA-jp");
+  TranslateHelper::CorrectLanguageCodeTypo(&language);
+  EXPECT_EQ("ja-JP", language);
+}
+
 // Tests that synonym language code is converted to one used in supporting list.
 TEST_F(TranslateHelperTest, LanguageCodeSynonyms) {
   std::string language;
 
   language = std::string("nb");
   TranslateHelper::ConvertLanguageCodeSynonym(&language);
   EXPECT_EQ("no", language);
 
   language = std::string("he");
   TranslateHelper::ConvertLanguageCodeSynonym(&language);
   EXPECT_EQ("iw", language);
 
   language = std::string("jv");
   TranslateHelper::ConvertLanguageCodeSynonym(&language);
   EXPECT_EQ("jw", language);
 
   language = std::string("fil");
   TranslateHelper::ConvertLanguageCodeSynonym(&language);
   EXPECT_EQ("tl", language);
 }