diff --git a/core/modules/locale/lib/Drupal/locale/Tests/LocaleTranslationTest.php b/core/modules/locale/lib/Drupal/locale/Tests/LocaleTranslationTest.php
index bb07116..f225e3b 100644
--- a/core/modules/locale/lib/Drupal/locale/Tests/LocaleTranslationTest.php
+++ b/core/modules/locale/lib/Drupal/locale/Tests/LocaleTranslationTest.php
@@ -38,7 +38,7 @@ function testEnglishTranslation() {
     $this->drupalLogin($admin_user);
 
     $this->drupalPost('admin/config/regional/language/edit/en', array('locale_translate_english' => TRUE), t('Save language'));
-    $this->assertLinkByHref('/admin/config/regional/translate/translate?langcode=en', 0, t('Enabled interface translation to English.'));
+    $this->assertLinkByHref('/admin/config/regional/translate/translate?langcode=en', 0, 'Enabled interface translation to English.');
   }
 
   /**
diff --git a/core/modules/locale/lib/Drupal/locale/Tests/LocaleUninstallTest.php b/core/modules/locale/lib/Drupal/locale/Tests/LocaleUninstallTest.php
index 6a8037f..6c6522d 100644
--- a/core/modules/locale/lib/Drupal/locale/Tests/LocaleUninstallTest.php
+++ b/core/modules/locale/lib/Drupal/locale/Tests/LocaleUninstallTest.php
@@ -112,7 +112,7 @@ function testUninstallProcess() {
     $this->assertEqual(language(LANGUAGE_TYPE_INTERFACE)->langcode, 'en', format_string('Language after uninstall: %lang', array('%lang' => language(LANGUAGE_TYPE_INTERFACE)->langcode)));
 
     // Check JavaScript files deletion.
-    $this->assertTrue($result = !file_exists($js_file), format_string('JavaScript file deleted: %file', array('%file' => $result ? $js_file : t('found'))));
+    $this->assertTrue($result = !file_exists($js_file), format_string('JavaScript file deleted: %file', array('%file' => $result ? $js_file : 'found')));
 
     // Check language count.
     $language_count = variable_get('language_count', 1);
@@ -120,13 +120,13 @@ function testUninstallProcess() {
 
     // Check language negotiation.
     require_once DRUPAL_ROOT . '/core/includes/language.inc';
-    $this->assertTrue(count(language_types_get_all()) == count(language_types_get_default()), t('Language types reset'));
+    $this->assertTrue(count(language_types_get_all()) == count(language_types_get_default()), 'Language types reset');
     $language_negotiation = language_negotiation_method_get_first(LANGUAGE_TYPE_INTERFACE) == LANGUAGE_NEGOTIATION_SELECTED;
-    $this->assertTrue($language_negotiation, format_string('Interface language negotiation: %setting', array('%setting' => t($language_negotiation ? 'none' : 'set'))));
+    $this->assertTrue($language_negotiation, format_string('Interface language negotiation: %setting', array('%setting' => $language_negotiation ? 'none' : 'set')));
     $language_negotiation = language_negotiation_method_get_first(LANGUAGE_TYPE_CONTENT) == LANGUAGE_NEGOTIATION_SELECTED;
-    $this->assertTrue($language_negotiation, format_string('Content language negotiation: %setting', array('%setting' => t($language_negotiation ? 'none' : 'set'))));
+    $this->assertTrue($language_negotiation, format_string('Content language negotiation: %setting', array('%setting' => $language_negotiation ? 'none' : 'set')));
     $language_negotiation = language_negotiation_method_get_first(LANGUAGE_TYPE_URL) == LANGUAGE_NEGOTIATION_SELECTED;
-    $this->assertTrue($language_negotiation, format_string('URL language negotiation: %setting', array('%setting' => t($language_negotiation ? 'none' : 'set'))));
+    $this->assertTrue($language_negotiation, format_string('URL language negotiation: %setting', array('%setting' => $language_negotiation ? 'none' : 'set')));
 
     // Check language negotiation method settings.
     $this->assertFalse(config('language.negotiation')->get('url.source'), 'URL language negotiation method indicator settings cleared.');
diff --git a/core/modules/locale/lib/Drupal/locale/Tests/LocaleUpdateTest.php b/core/modules/locale/lib/Drupal/locale/Tests/LocaleUpdateTest.php
index e5dccbd..4a8e760 100644
--- a/core/modules/locale/lib/Drupal/locale/Tests/LocaleUpdateTest.php
+++ b/core/modules/locale/lib/Drupal/locale/Tests/LocaleUpdateTest.php
@@ -98,7 +98,7 @@ function addLanguage($langcode) {
     $edit = array('predefined_langcode' => $langcode);
     $this->drupalPost('admin/config/regional/language/add', $edit, t('Add language'));
     drupal_static_reset('language_list');
-    $this->assertTrue(language_load($langcode), t('Language %langcode added.', array('%langcode' => $langcode)));
+    $this->assertTrue(language_load($langcode), format_string('Language %langcode added.', array('%langcode' => $langcode)));
   }
 
   /**
@@ -769,8 +769,8 @@ function testEnableCustomLanguage() {
 
     // Ensure the translation file is automatically imported when the language
     // was added.
-    $this->assertText(t('One translation file imported.'), t('Language file automatically imported.'));
-    $this->assertText(t('One translation string was skipped because of disallowed or malformed HTML'), t('Language file automatically imported.'));
+    $this->assertText(t('One translation file imported.'), 'Language file automatically imported.');
+    $this->assertText(t('One translation string was skipped because of disallowed or malformed HTML'), 'Language file automatically imported.');
 
     // Ensure the strings were successfully imported.
     $search = array(
@@ -779,7 +779,7 @@ function testEnableCustomLanguage() {
       'translation' => 'translated',
     );
     $this->drupalPost('admin/config/regional/translate/translate', $search, t('Filter'));
-    $this->assertNoText(t('No strings available.'), t('String successfully imported.'));
+    $this->assertNoText(t('No strings available.'), 'String successfully imported.');
 
     // Ensure the multiline string was imported.
     $search = array(
@@ -788,7 +788,7 @@ function testEnableCustomLanguage() {
       'translation' => 'all',
     );
     $this->drupalPost('admin/config/regional/translate/translate', $search, t('Filter'));
-    $this->assertText('Multiline translation string to make sure that import works with it.', t('String successfully imported.'));
+    $this->assertText('Multiline translation string to make sure that import works with it.', 'String successfully imported.');
 
     // Ensure 'Allowed HTML source string' was imported but the translation for
     // 'Another allowed HTML source string' was not because it contains invalid
@@ -799,8 +799,8 @@ function testEnableCustomLanguage() {
       'translation' => 'all',
     );
     $this->drupalPost('admin/config/regional/translate/translate', $search, t('Filter'));
-    $this->assertText('Allowed HTML source string', t('String successfully imported.'));
-    $this->assertNoText('Another allowed HTML source string', t('String with disallowed translation not imported.'));
+    $this->assertText('Allowed HTML source string', 'String successfully imported.');
+    $this->assertNoText('Another allowed HTML source string', 'String with disallowed translation not imported.');
   }
 
 }