diff --git a/core/modules/system/lib/Drupal/system/Tests/Image/ToolkitGdTest.php b/core/modules/system/lib/Drupal/system/Tests/Image/ToolkitGdTest.php
index 611126d..91235e1 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Image/ToolkitGdTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Image/ToolkitGdTest.php
@@ -206,13 +206,13 @@ function testManipulations() {
         // Load up a fresh image.
         $image = image_load(drupal_get_path('module', 'simpletest') . '/files/' . $file, 'gd');
         if (!$image) {
-          $this->fail(t('Could not load image %file.', array('%file' => $file)));
+          $this->fail(format_string('Could not load image %file.', array('%file' => $file)));
           continue 2;
         }
 
         // All images should be converted to truecolor when loaded.
         $image_truecolor = imageistruecolor($image->resource);
-        $this->assertTrue($image_truecolor, t('Image %file after load is a truecolor image.', array('%file' => $file)));
+        $this->assertTrue($image_truecolor, format_string('Image %file after load is a truecolor image.', array('%file' => $file)));
 
         if ($image->info['extension'] == 'gif') {
           if ($op == 'desaturate') {
@@ -248,8 +248,8 @@ function testManipulations() {
         file_prepare_directory($directory, FILE_CREATE_DIRECTORY);
         image_save($image, $directory . '/' . $op . '.' . $image->info['extension']);
 
-        $this->assertTrue($correct_dimensions_real, t('Image %file after %action action has proper dimensions.', array('%file' => $file, '%action' => $op)));
-        $this->assertTrue($correct_dimensions_object, t('Image %file object after %action action is reporting the proper height and width values.', array('%file' => $file, '%action' => $op)));
+        $this->assertTrue($correct_dimensions_real, format_string('Image %file after %action action has proper dimensions.', array('%file' => $file, '%action' => $op)));
+        $this->assertTrue($correct_dimensions_object, format_string('Image %file object after %action action is reporting the proper height and width values.', array('%file' => $file, '%action' => $op)));
 
         // JPEG colors will always be messed up due to compression.
         if ($image->info['extension'] != 'jpg') {
@@ -276,7 +276,7 @@ function testManipulations() {
             }
             $color = $this->getPixelColor($image, $x, $y);
             $correct_colors = $this->colorsAreEqual($color, $corner);
-            $this->assertTrue($correct_colors, t('Image %file object after %action action has the correct color placement at corner %corner.', array('%file' => $file, '%action' => $op, '%corner' => $key)));
+            $this->assertTrue($correct_colors, format_string('Image %file object after %action action has the correct color placement at corner %corner.', array('%file' => $file, '%action' => $op, '%corner' => $key)));
           }
         }
       }