diff --git a/core/modules/config/src/Tests/ConfigImportAllTest.php b/core/modules/config/src/Tests/ConfigImportAllTest.php
index baeacb9..bba40f3 100644
--- a/core/modules/config/src/Tests/ConfigImportAllTest.php
+++ b/core/modules/config/src/Tests/ConfigImportAllTest.php
@@ -144,6 +144,12 @@ public function testInstallUninstall() {
       $this->container->get('config.storage'),
       $this->container->get('config.manager')
     );
+    $changelist = $storage_comparer->createChangelist()->getChangelist();
+    foreach ($changelist['update'] as $config_name) {
+      $diff = \Drupal::service('config.manager')->diff($this->container->get('config.storage'), $this->container->get('config.storage.sync'), $config_name);
+      // This will fail... but then we get to see the differences.
+      $this->assertEqual('', $this->container->get('diff.formatter')->format($diff));
+    }
     $this->assertIdentical($storage_comparer->createChangelist()->getChangelist(), $storage_comparer->getEmptyChangelist());
 
     // Now we have all configuration imported, test all of them for schema