Don't offer to translate between Simplified and Traditional Chinese

components/translate/core/browser/translate_manager_unittest.cc

Index: components/translate/core/browser/translate_manager_unittest.cc
diff --git a/components/translate/core/browser/translate_manager_unittest.cc b/components/translate/core/browser/translate_manager_unittest.cc
index fda38d798ab21257c32a8274876b62fa875d7958..dfe069661fa0fe5ea25bb4f39f62be0b0b3076d2 100644
--- a/components/translate/core/browser/translate_manager_unittest.cc
+++ b/components/translate/core/browser/translate_manager_unittest.cc
@@ -307,6 +307,64 @@ TEST_F(TranslateManagerTest, DontTranslateOffline) {
       1);
 }
 
+// The test measures that Translate is not triggered for a zh-TW page for a
+// zh-CN user.
+TEST_F(TranslateManagerTest,
+       DontTranslateZhTraditionalPageForZhSimplifiedLocale) {
+  TranslateManager::SetIgnoreMissingKeyForTesting(true);
+  translate_manager_.reset(new translate::TranslateManager(
+      &mock_translate_client_, kAcceptLanguages));
+
+  const char kMetricName[] = "Translate.InitiationStatus.v2";
+  base::HistogramTester histogram_tester;
+
+  const std::string locale = "zh-TW";
+  const std::string page_lang = "zh-CN";
+
+  network_notifier_.SimulateOnline();
+  manager_->set_application_locale(locale);
+  ON_CALL(mock_translate_client_, IsTranslatableURL(_))
+      .WillByDefault(Return(true));
+
+  EXPECT_EQ("zh-TW", translate_manager_->GetTargetLanguage(&translate_prefs_));
+  translate_manager_->GetLanguageState().LanguageDetermined(page_lang, true);
+  translate_manager_->InitiateTranslation(page_lang);
+
+  histogram_tester.ExpectUniqueSample(
+      kMetricName,
+      translate::TranslateBrowserMetrics::INITIATION_STATUS_SIMILAR_LANGUAGES,
+      1);
+}
+
+// The test measures that Translate is not triggered for a zh-CN page for a
+// zh-TW user.
+TEST_F(TranslateManagerTest,
+       DontTranslateZhSimplifiedPageForZhTraditionalLocale) {
+  TranslateManager::SetIgnoreMissingKeyForTesting(true);
+  translate_manager_.reset(new translate::TranslateManager(
+      &mock_translate_client_, kAcceptLanguages));
+
+  const char kMetricName[] = "Translate.InitiationStatus.v2";
+  base::HistogramTester histogram_tester;
+
+  const std::string locale = "zh-CN";
+  const std::string page_lang = "zh-TW";
+
+  network_notifier_.SimulateOnline();
+  manager_->set_application_locale(locale);
+  ON_CALL(mock_translate_client_, IsTranslatableURL(_))
+      .WillByDefault(Return(true));
+
+  EXPECT_EQ("zh-CN", translate_manager_->GetTargetLanguage(&translate_prefs_));
+  translate_manager_->GetLanguageState().LanguageDetermined(page_lang, true);
+  translate_manager_->InitiateTranslation(page_lang);
+
+  histogram_tester.ExpectUniqueSample(
+      kMetricName,
+      translate::TranslateBrowserMetrics::INITIATION_STATUS_SIMILAR_LANGUAGES,
+      1);
+}
+
 // Utility function to set the threshold params
 void ChangeThresholdInParams(
     const char* initiate_translation_confidence_threshold,