diff --git a/core/modules/system/src/Tests/Cache/GenericCacheBackendUnitTestBase.php b/core/modules/system/src/Tests/Cache/GenericCacheBackendUnitTestBase.php
index 5df23c9..1a9640d 100644
--- a/core/modules/system/src/Tests/Cache/GenericCacheBackendUnitTestBase.php
+++ b/core/modules/system/src/Tests/Cache/GenericCacheBackendUnitTestBase.php
@@ -508,6 +508,10 @@ function testInvalidate() {
     $cids = $reference;
     $ret = $backend->getMultiple($cids, TRUE);
     $this->assertEqual(count($ret), 4, 'Four items returned.');
+    // Test that calling invalidate() does not change data.
+    $this->assertIdentical($ret['test1']->data, 1);
+    // Test that calling invalidateMultiple() does not change data.
+    $this->assertIdentical($ret['test2']->data, 2);
   }
 
   /**
@@ -589,6 +593,8 @@ public function testInvalidateAll() {
     $this->assertTrue($unrelated->get('test3'), 'Item in other bin is preserved.');
     $this->assertTrue($backend->get('test1', TRUE), 'First key has not been deleted.');
     $this->assertTrue($backend->get('test2', TRUE), 'Second key has not been deleted.');
+    // Test that calling invalidateAll() does not change data.
+    $this->assertIdentical($backend->get('test1', TRUE)->data, 1);
   }
 
 }