diff --git a/core/modules/node/node.test b/core/modules/node/node.test
index 93a4d97..5ad62ce 100644
--- a/core/modules/node/node.test
+++ b/core/modules/node/node.test
@@ -328,13 +328,20 @@ class NodeRevisionPermissionsTestCase extends DrupalWebTestCase {
    * Tests multiple calls to _node_revision_access() within the same request.
    */
   function testNodeRevisionAccessCaching() {
+    // We have three users. Each corresponds to one revision permission.
+    // Test the results of _node_revision_access() for each permission.
     foreach ($this->users as $user_op => $user) {
+      // Visit the test page provided by node_revision_test.module.
       $this->drupalLogin($user);
       $this->drupalGet('node_revision_access_test/' . $this->node_revisions[1]->nid . '/' .  $this->node_revisions[1]->vid);
+
+      // Check results for each permission. Each permission is tested twice.
       foreach (array_keys($this->map) as $test_op) {
+        // If the user has the permission, access should be granted twice.
         if ($test_op == $user_op) {
-          $this->assertText(format_string("@op granted", array('@op' => $test_op)));
+          $this->assertNoUniqueText(format_string("@op granted", array('@op' => $test_op)));
         }
+        // Otherwise, access should not be granted.
         else {
           $this->assertNoText(format_string("@op granted", array('@op' => $test_op)));
         }