diff --git a/core/modules/simpletest/lib/Drupal/simpletest/WebTestBase.php b/core/modules/simpletest/lib/Drupal/simpletest/WebTestBase.php
index 60a6028..5d736df 100644
--- a/core/modules/simpletest/lib/Drupal/simpletest/WebTestBase.php
+++ b/core/modules/simpletest/lib/Drupal/simpletest/WebTestBase.php
@@ -2354,7 +2354,10 @@ abstract class WebTestBase extends TestBase {
    */
   protected function assertNoPattern($pattern, $message = '', $group = 'Other') {
     $message = $this->assertionMessage(
-      'Pattern "@pattern" not found', array('@pattern' => $pattern),
+      format_string(
+        'Pattern "@pattern" not found',
+        array('@pattern' => $pattern)
+      ),
       $message
     );
     return $this->assert(!preg_match($pattern, $this->drupalGetContent()), $message, $group);
@@ -2530,15 +2533,21 @@ abstract class WebTestBase extends TestBase {
    */
   protected function assertFieldByName($name, $value = NULL, $message = NULL) {
     if (!isset($value)) {
-      $default_message = t('Found field with name @name', array(
-        '@name' => var_export($name, TRUE),
-      ));
+      $default_message = format_string(
+        'Found field with name @name',
+        array(
+          '@name' => var_export($name, TRUE),
+        )
+      );
     }
     else {
-      $default_message = t('Found field with name @name and value @value', array(
-        '@name' => var_export($name, TRUE),
-        '@value' => var_export($value, TRUE),
-      ));
+      $default_message = format_string(
+        'Found field with name @name and value @value',
+        array(
+          '@name' => var_export($name, TRUE),
+          '@value' => var_export($value, TRUE),
+        )
+      );
     }
     $message = $this->assertionMessage($default_message, $message);
     return $this->assertFieldByXPath($this->constructFieldXpath('name', $name), $value, $message, t('Browser'));