only in patch2:
unchanged:
--- a/core/modules/config/lib/Drupal/config/Tests/ConfigCRUDTest.php
+++ b/core/modules/config/lib/Drupal/config/Tests/ConfigCRUDTest.php
@@ -224,16 +224,6 @@ public function testDataTypes() {
     $config->setData($data)->save();
     $this->assertIdentical($config->get(), $data);
     $this->assertIdentical($storage->read($name), $data);
-
-    try {
-      $config->set('stream', fopen(__FILE__, 'r'))->save();
-      $this->fail('No Exception thrown upon saving invalid data type.');
-    }
-    catch (\Exception $e) {
-      $this->pass(format_string('%class thrown upon saving invalid data type.', array(
-        '%class' => get_class($e),
-      )));
-    }
   }
 
 }