diff --git a/core/modules/menu_ui/src/Tests/MenuTest.php b/core/modules/menu_ui/src/Tests/MenuTest.php
index e3310e7..84c1440 100644
--- a/core/modules/menu_ui/src/Tests/MenuTest.php
+++ b/core/modules/menu_ui/src/Tests/MenuTest.php
@@ -7,6 +7,7 @@
 
 namespace Drupal\menu_ui\Tests;
 
+use Drupal\block\Entity\Block;
 use Drupal\Component\Serialization\Json;
 use Drupal\Component\Utility\Unicode;
 use Drupal\Core\Cache\Cache;
@@ -887,14 +888,14 @@ protected function doTestMenuBlock() {
       'settings[depth]' => 3,
       'settings[level]' => 2,
     ], t('Save block'));
-    $this->drupalGet('admin/structure/block/manage/' . $block_id);
-    $this->assertFieldByName('settings[depth]', 3);
-    $this->assertFieldByName('settings[level]', 2);
+    $block = Block::load($block_id);
+    $settings = $block->getPlugin()->getConfiguration();
+    $this->assertEqual($settings['depth'], 3);
+    $this->assertEqual($settings['level'], 2);
     // Reset settings.
-    $this->drupalPostForm(NULL, [
-      'settings[depth]' => 0,
-      'settings[level]' => 1,
-    ], t('Save block'));
+    $block->getPlugin()->setConfigurationValue('depth', 0);
+    $block->getPlugin()->setConfigurationValue('level', 1);
+    $block->save();
   }
 
 }