diff --git a/core/modules/node/src/Tests/NodeRevisionsTest.php b/core/modules/node/src/Tests/NodeRevisionsTest.php
index 5870606..521c14d 100644
--- a/core/modules/node/src/Tests/NodeRevisionsTest.php
+++ b/core/modules/node/src/Tests/NodeRevisionsTest.php
@@ -159,14 +159,13 @@ function testRevisions() {
     // Confirm that the "Edit" and "Delete" contextual links appear for the
     // default revision.
     $ids = array('node:node=' . $node->id() . ':changed=' . $node->getChangedTime());
-    $response = $this->renderContextualLinks($ids, "node/" . $node->id());
-    $json = Json::decode($response);
+    $json = $this->renderContextualLinks($ids, "node/" . $node->id());
     $this->verbose($json[$ids[0]]);
 
-    $this->assertTrue(strstr($json[$ids[0]], '<li class="entitynodeedit-form"><a href="' . base_path() . 'node/' . $node->id() . '/edit">Edit</a></li>'),
-      'The "Edit" contextual link is shown for the default revision.');
-    $this->assertTrue(strstr($json[$ids[0]], '<li class="entitynodedelete-form"><a href="' . base_path() . 'node/' . $node->id() . '/delete">Delete</a></li>'),
-      'The "Delete" contextual link is shown for the default revision.');
+    $expected = '<li class="entitynodeedit-form"><a href="' . base_path() . 'node/' . $node->id() . '/edit">Edit</a></li>';
+    $this->assertTrue(strstr($json[$ids[0]], $expected), 'The "Edit" contextual link is shown for the default revision.');
+    $expected = '<li class="entitynodedelete-form"><a href="' . base_path() . 'node/' . $node->id() . '/delete">Delete</a></li>');
+    $this->assertTrue(strstr($json[$ids[0]], $expected), 'The "Delete" contextual link is shown for the default revision.');
 
     // Confirm that revisions revert properly.
     $this->drupalPostForm("node/" . $node->id() . "/revisions/" . $nodes[1]->getRevisionid() . "/revert", array(), t('Revert'));
@@ -184,8 +183,7 @@ function testRevisions() {
     // Confirm that "Edit" and "Delete" contextual links don't appear for
     // non-default revision.
     $ids = array('node_revision::node=' . $node->id() . '&node_revision=' . $node->getRevisionId() . ':');
-    $response = $this->renderContextualLinks($ids, "node/" . $node->id() . '/revisions/' . $node->getRevisionId() . '/view');
-    $json = Json::decode($response);
+    $json = $this->renderContextualLinks($ids, "node/" . $node->id() . '/revisions/' . $node->getRevisionId() . '/view');
     $this->verbose($json[$ids[0]]);
 
     $this->assertFalse(strstr($json[$ids[0]], '<li class="entitynodeedit-form">'),
@@ -300,14 +298,16 @@ function testNodeRevisionWithoutLogMessage() {
    *   The Drupal path for the page for which the contextual links are rendered.
    *
    * @return string
-   *   The response body.
+   *   The decoded Json response body.
    */
   protected function renderContextualLinks($ids, $current_path) {
     $post = array();
     for ($i = 0; $i < count($ids); $i++) {
       $post['ids[' . $i . ']'] = $ids[$i];
     }
-    return $this->drupalPost('contextual/render', 'application/json', $post, array('query' => array('destination' => $current_path)));
+    $response = $this->drupalPost('contextual/render', 'application/json', $post, array('query' => array('destination' => $current_path)));
+
+    return Json::decode($response);
   }
 
   /**