Merge branch 'winh-jest-time' into 'master'

Mock and wait for timers in Jest

Closes #56056

See merge request gitlab-org/gitlab-ce!26433

jest.config.js

@@ -36,4 +36,5 @@ module.exports = {
     '^.+\\.vue$': 'vue-jest',
   },
   transformIgnorePatterns: ['node_modules/(?!(@gitlab/ui)/)'],
+  timers: 'fake',
 };

spec/frontend/test_setup.js

@@ -3,6 +3,11 @@ import Translate from '~/vue_shared/translate';
 import axios from '~/lib/utils/axios_utils';
 import { initializeTestTimeout } from './helpers/timeout';
 
+// wait for pending setTimeout()s
+afterEach(() => {
+  jest.runAllTimers();
+});
+
 initializeTestTimeout(300);
 
 // fail tests for unmocked requests