Issue #2096593 by Wim Leers: Remove drupal_add_css() from system.module.

core/modules/system/tests/modules/common_test/lib/Drupal/common_test/Controller/CommonTestController.php

@@ -82,11 +82,19 @@ public function drupalRenderInvalidKeys() {
    *   An empty string.
    */
   public function jsAndCssQuerystring() {
-    drupal_add_library('system', 'drupalSettings');
-    drupal_add_js(drupal_get_path('module', 'node') . '/node.js');
-    drupal_add_css(drupal_get_path('module', 'node') . '/css/node.admin.css');
-    // A relative URI may have a query string.
-    drupal_add_css('/' . drupal_get_path('module', 'node') . '/node-fake.css?arg1=value1&arg2=value2');
+    $attached = array(
+      '#attached' => array(
+        'library' => array(
+          array('node', 'drupal.node'),
+        ),
+        'css' => array(
+          drupal_get_path('module', 'node') . '/css/node.admin.css' => array(),
+          // A relative URI may have a query string.
+          '/' . drupal_get_path('module', 'node') . '/node-fake.css?arg1=value1&arg2=value2' => array(),
+        ),
+      ),
+    );
+    drupal_render($attached);
     return '';
   }