diff --git a/core/modules/locale/lib/Drupal/locale/Tests/LocalePluralFormatTest.php b/core/modules/locale/lib/Drupal/locale/Tests/LocalePluralFormatTest.php
index 37ef351..497c824 100644
--- a/core/modules/locale/lib/Drupal/locale/Tests/LocalePluralFormatTest.php
+++ b/core/modules/locale/lib/Drupal/locale/Tests/LocalePluralFormatTest.php
@@ -121,12 +121,24 @@ class LocalePluralFormatTest extends WebTestBase {
     foreach ($plural_tests as $langcode => $tests) {
       foreach ($tests as $count => $expected_plural_index) {
         // Assert that the we get the right plural index.
-        $this->assertIdentical(locale_get_plural($count, $langcode), $expected_plural_index, 'Computed plural index for ' . $langcode . ' for count ' . $count . ' is ' . $expected_plural_index);
+        $this->assertIdentical(locale_get_plural($count, $langcode), $expected_plural_index,
+          format_string('Computed plural index for %langcode for count %count is %expected', array(
+            '%langcode' => $langcode,
+            '%count' => $count,
+            '%expect' => $expected_plural_index
+          ))
+        );
         // Assert that the we get the right translation for that. Change the
         // expected index as per the logic for translation lookups.
         $expected_plural_index = ($count == 1) ? 0 : $expected_plural_index;
         $expected_plural_string = str_replace('@count', $count, $plural_strings[$langcode][$expected_plural_index]);
-        $this->assertIdentical(format_plural($count, '1 hour', '@count hours', array(), array('langcode' => $langcode)), $expected_plural_string, 'Plural translation of 1 hours / @count hours for count ' . $count . ' in ' . $langcode . ' is ' . $expected_plural_string);
+        $this->assertIdentical(format_plural($count, '1 hour', '@count hours', array(), array('langcode' => $langcode)), $expected_plural_string,
+          format_string('Plural translation of 1 hours / @count hours for count %count in %langcode is %expected', array(
+            '%count' => $count,
+            '%langcode' => $langcode,
+            '%expected' => $expected_plural_string
+          ))
+        );
       }
     }
   }
diff --git a/core/modules/locale/lib/Drupal/locale/Tests/LocaleTranslationTest.php b/core/modules/locale/lib/Drupal/locale/Tests/LocaleTranslationTest.php
index 87ca3be..509b272 100644
--- a/core/modules/locale/lib/Drupal/locale/Tests/LocaleTranslationTest.php
+++ b/core/modules/locale/lib/Drupal/locale/Tests/LocaleTranslationTest.php
@@ -244,14 +244,14 @@ class LocaleTranslationTest extends WebTestBase {
 
     $locale_javascripts = variable_get('locale_translation_javascript', array());
     $js_file = 'public://' . variable_get('locale_js_directory', 'languages') . '/' . $langcode . '_' . $locale_javascripts[$langcode] . '.js';
-    $this->assertTrue($result = file_exists($js_file), format_string('JavaScript file created: %file', array('%file' => $result ? $js_file : t('not found'))));
+    $this->assertTrue($result = file_exists($js_file), format_string('JavaScript file created: %file', array('%file' => $result ? $js_file : 'not found')));
 
     // Test JavaScript translation rebuilding.
     file_unmanaged_delete($js_file);
-    $this->assertTrue($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 ? $js_file : 'found')));
     cache_invalidate(array('content' => TRUE));
     _locale_rebuild_js($langcode);
-    $this->assertTrue($result = file_exists($js_file), format_string('JavaScript file rebuilt: %file', array('%file' => $result ? $js_file : t('not found'))));
+    $this->assertTrue($result = file_exists($js_file), format_string('JavaScript file rebuilt: %file', array('%file' => $result ? $js_file : 'not found')));
   }
 
   /**
diff --git a/core/modules/locale/lib/Drupal/locale/Tests/LocaleUninstallTest.php b/core/modules/locale/lib/Drupal/locale/Tests/LocaleUninstallTest.php
index f41a752..7141c0e 100644
--- a/core/modules/locale/lib/Drupal/locale/Tests/LocaleUninstallTest.php
+++ b/core/modules/locale/lib/Drupal/locale/Tests/LocaleUninstallTest.php
@@ -80,7 +80,7 @@ class LocaleUninstallTest extends WebTestBase {
     _locale_rebuild_js('fr');
     $locale_javascripts = variable_get('locale_translation_javascript', array());
     $js_file = 'public://' . variable_get('locale_js_directory', 'languages') . '/fr_' . $locale_javascripts['fr'] . '.js';
-    $this->assertTrue($result = file_exists($js_file), format_string('JavaScript file created: %file', array('%file' => $result ? $js_file : t('none'))));
+    $this->assertTrue($result = file_exists($js_file), format_string('JavaScript file created: %file', array('%file' => $result ? $js_file : 'none')));
 
     // Disable string caching.
     variable_set('locale_cache_strings', 0);
@@ -109,7 +109,7 @@ class LocaleUninstallTest extends WebTestBase {
     $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);