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diff --git a/spec/frontend/__helpers__/shared_test_setup.js b/spec/frontend/__helpers__/shared_test_setup.js
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+/* Common setup for both unit and integration test environments */
+import { config as testUtilsConfig } from '@vue/test-utils';
+import * as jqueryMatchers from 'custom-jquery-matchers';
+import Vue from 'vue';
+import 'jquery';
+import Translate from '~/vue_shared/translate';
+import setWindowLocation from './set_window_location_helper';
+import { setGlobalDateToFakeDate } from './fake_date';
+import { loadHTMLFixture, setHTMLFixture } from './fixtures';
+import { TEST_HOST } from './test_constants';
+import customMatchers from './matchers';
+
+import './dom_shims';
+import './jquery';
+import '~/commons/bootstrap';
+
+// This module has some fairly decent visual test coverage in it's own repository.
+jest.mock('@gitlab/favicon-overlay');
+
+process.on('unhandledRejection', global.promiseRejectionHandler);
+
+// Fake the `Date` for the rest of the jest spec runtime environment.
+// https://gitlab.com/gitlab-org/gitlab/-/merge_requests/39496#note_503084332
+setGlobalDateToFakeDate();
+
+Vue.config.devtools = false;
+Vue.config.productionTip = false;
+
+Vue.use(Translate);
+
+// convenience wrapper for migration from Karma
+Object.assign(global, {
+  loadFixtures: loadHTMLFixture,
+  setFixtures: setHTMLFixture,
+});
+
+const JQUERY_MATCHERS_TO_EXCLUDE = ['toHaveLength', 'toExist'];
+
+// custom-jquery-matchers was written for an old Jest version, we need to make it compatible
+Object.entries(jqueryMatchers).forEach(([matcherName, matcherFactory]) => {
+  // Exclude these jQuery matchers
+  if (JQUERY_MATCHERS_TO_EXCLUDE.includes(matcherName)) {
+    return;
+  }
+
+  expect.extend({
+    [matcherName]: matcherFactory().compare,
+  });
+});
+
+expect.extend(customMatchers);
+
+testUtilsConfig.deprecationWarningHandler = (method, message) => {
+  const ALLOWED_DEPRECATED_METHODS = [
+    // https://gitlab.com/gitlab-org/gitlab/-/issues/295679
+    'finding components with `find` or `get`',
+
+    // https://gitlab.com/gitlab-org/gitlab/-/issues/295680
+    'finding components with `findAll`',
+  ];
+  if (!ALLOWED_DEPRECATED_METHODS.includes(method)) {
+    global.console.error(message);
+  }
+};
+
+Object.assign(global, {
+  requestIdleCallback(cb) {
+    const start = Date.now();
+    return setTimeout(() => {
+      cb({
+        didTimeout: false,
+        timeRemaining: () => Math.max(0, 50 - (Date.now() - start)),
+      });
+    });
+  },
+  cancelIdleCallback(id) {
+    clearTimeout(id);
+  },
+});
+
+beforeEach(() => {
+  // make sure that each test actually tests something
+  // see https://jestjs.io/docs/en/expect#expecthasassertions
+  expect.hasAssertions();
+
+  // Reset the mocked window.location. This ensures tests don't interfere with
+  // each other, and removes the need to tidy up if it was changed for a given
+  // test.
+  setWindowLocation(TEST_HOST);
+});