Issue #3406222 by catch: Frequent random test failures in...

Issue #3406222 by catch: Frequent random test failures in Drupal\Tests\field_ui\FunctionalJavascript\ManageFieldsTest

core/modules/field_ui/tests/src/FunctionalJavascript/ManageFieldsTest.php

@@ -343,8 +343,8 @@ public function testAllowedValuesFormValidation() {
     $this->drupalGet('/admin/structure/types/manage/article/fields/node.article.field_text');
     $page = $this->getSession()->getPage();
     $page->findField('edit-field-storage-subform-cardinality-number')->setValue('-11');
+    $this->assertSession()->assertExpectedAjaxRequest(1);
     $page->findButton('Save settings')->click();
-    $this->assertSession()->assertWaitOnAjaxRequest();
     $this->assertSession()->pageTextContains('Limit must be higher than or equal to 1.');
   }