tests: minor cleanup (#35138)

* tests: minor cleanup

* tests: use the util noop function

js/tests/unit/collapse.spec.js

@@ -1,7 +1,5 @@
 import Collapse from '../../src/collapse'
 import EventHandler from '../../src/dom/event-handler'
-
-/** Test helpers */
 import { clearFixture, getFixture, jQueryMock } from '../helpers/fixture'
 
 describe('Collapse', () => {