Issue #3159739 by jungle, Beakerboy, daffie: Avoid directly comparing string...

Issue #3159739 by jungle, Beakerboy, daffie: Avoid directly comparing string to blob in EntityDisplayTest

(cherry picked from commit 9346c2ff)

core/modules/field_ui/tests/src/Kernel/EntityDisplayTest.php

@@ -638,14 +638,13 @@ public function testComponentDependencies() {
     $this->assertTrue($form_display->get('hidden')[$field_name]);
     // The correct warning message has been logged.
     $arguments = ['@display' => (string) t('Entity form display'), '@id' => $form_display->id(), '@name' => $field_name];
-    $logged = (bool) Database::getConnection()->select('watchdog', 'w')
-      ->fields('w', ['wid'])
+    $variables = Database::getConnection()->select('watchdog', 'w')
+      ->fields('w', ['variables'])
       ->condition('type', 'system')
       ->condition('message', "@display '@id': Component '@name' was disabled because its settings depend on removed dependencies.")
-      ->condition('variables', serialize($arguments))
       ->execute()
-      ->fetchAll();
-    $this->assertTrue($logged);
+      ->fetchField();
+    $this->assertEquals($arguments, unserialize($variables));
   }
 
   /**