Copy missing helpers from Karma to Jest

Copy missing helpers from Karma to Jest

spec/frontend/helpers/class_spec_helper.js

+export default class ClassSpecHelper {
+  static itShouldBeAStaticMethod(base, method) {
+    return it('should be a static method', () => {
+      expect(Object.prototype.hasOwnProperty.call(base, method)).toBeTruthy();
+    });
+  }
+}
+
+window.ClassSpecHelper = ClassSpecHelper;

spec/frontend/helpers/locale_helper.js

+/* eslint-disable import/prefer-default-export */
+
+export const setLanguage = languageCode => {
+  const htmlElement = document.querySelector('html');
+
+  if (languageCode) {
+    htmlElement.setAttribute('lang', languageCode);
+  } else {
+    htmlElement.removeAttribute('lang');
+  }
+};

spec/frontend/helpers/scroll_into_view_promise.js

+export default function scrollIntoViewPromise(intersectionTarget, timeout = 100, maxTries = 5) {
+  return new Promise((resolve, reject) => {
+    let intersectionObserver;
+    let retry = 0;
+
+    const intervalId = setInterval(() => {
+      if (retry >= maxTries) {
+        intersectionObserver.disconnect();
+        clearInterval(intervalId);
+        reject(new Error(`Could not scroll target into viewPort within ${timeout * maxTries} ms`));
+      }
+      retry += 1;
+      intersectionTarget.scrollIntoView();
+    }, timeout);
+
+    intersectionObserver = new IntersectionObserver(entries => {
+      if (entries[0].isIntersecting) {
+        intersectionObserver.disconnect();
+        clearInterval(intervalId);
+        resolve();
+      }
+    });
+
+    intersectionObserver.observe(intersectionTarget);
+
+    intersectionTarget.scrollIntoView();
+  });
+}

spec/frontend/helpers/set_timeout_promise_helper.js

+export default (time = 0) =>
+  new Promise(resolve => {
+    setTimeout(resolve, time);
+  });

spec/frontend/helpers/user_mock_data_helper.js

+export default {
+  createNumberRandomUsers(numberUsers) {
+    const users = [];
+    for (let i = 0; i < numberUsers; i += 1) {
+      users.push({
+        avatar: 'https://gravatar.com/avatar/e64c7d89f26bd1972efa854d13d7dd61?s=80&d=identicon',
+        id: i + 1,
+        name: `GitLab User ${i}`,
+        username: `gitlab${i}`,
+      });
+    }
+    return users;
+  },
+};

spec/frontend/helpers/vue_component_helper.js

+/**
+ * Replaces line break with an empty space
+ * @param {*} data
+ */
+export const removeBreakLine = data => data.replace(/\r?\n|\r/g, ' ');
+
+/**
+ * Removes line breaks, spaces and trims the given text
+ * @param {String} str
+ * @returns {String}
+ */
+export const trimText = str =>
+  str
+    .replace(/\r?\n|\r/g, '')
+    .replace(/\s\s+/g, ' ')
+    .trim();
+
+export const removeWhitespace = str => str.replace(/\s\s+/g, ' ');

spec/frontend/helpers/vue_resource_helper.js

+// eslint-disable-next-line import/prefer-default-export
+export const headersInterceptor = (request, next) => {
+  next(response => {
+    const headers = {};
+    response.headers.forEach((value, key) => {
+      headers[key] = value;
+    });
+    // eslint-disable-next-line no-param-reassign
+    response.headers = headers;
+  });
+};

spec/frontend/helpers/vue_test_utils_helper.js

+/* eslint-disable import/prefer-default-export */
+
+const vNodeContainsText = (vnode, text) =>
+  (vnode.text && vnode.text.includes(text)) ||
+  (vnode.children && vnode.children.filter(child => vNodeContainsText(child, text)).length);
+
+/**
+ * Determines whether a `shallowMount` Wrapper contains text
+ * within one of it's slots. This will also work on Wrappers
+ * acquired with `find()`, but only if it's parent Wrapper
+ * was shallowMounted.
+ * NOTE: Prefer checking the rendered output of a component
+ * wherever possible using something like `text()` instead.
+ * @param {Wrapper} shallowWrapper - Vue test utils wrapper (shallowMounted)
+ * @param {String} slotName
+ * @param {String} text
+ */
+export const shallowWrapperContainsSlotText = (shallowWrapper, slotName, text) =>
+  !!shallowWrapper.vm.$slots[slotName].filter(vnode => vNodeContainsText(vnode, text)).length;

spec/frontend/helpers/vuex_action_helper.js

+const noop = () => {};
+
+/**
+ * Helper for testing action with expected mutations inspired in
+ * https://vuex.vuejs.org/en/testing.html
+ *
+ * @param {Function} action to be tested
+ * @param {Object} payload will be provided to the action
+ * @param {Object} state will be provided to the action
+ * @param {Array} [expectedMutations=[]] mutations expected to be committed
+ * @param {Array} [expectedActions=[]] actions expected to be dispatched
+ * @param {Function} [done=noop] to be executed after the tests
+ * @return {Promise}
+ *
+ * @example
+ * testAction(
+ *   actions.actionName, // action
+ *   { }, // mocked payload
+ *   state, //state
+ *   // expected mutations
+ *   [
+ *    { type: types.MUTATION}
+ *    { type: types.MUTATION_1, payload: jasmine.any(Number)}
+ *   ],
+ *   // expected actions
+ *   [
+ *    { type: 'actionName', payload: {param: 'foobar'}},
+ *    { type: 'actionName1'}
+ *   ]
+ *   done,
+ * );
+ *
+ * @example
+ * testAction(
+ *   actions.actionName, // action
+ *   { }, // mocked payload
+ *   state, //state
+ *   [ { type: types.MUTATION} ], // expected mutations
+ *   [], // expected actions
+ * ).then(done)
+ * .catch(done.fail);
+ */
+export default (
+  action,
+  payload,
+  state,
+  expectedMutations = [],
+  expectedActions = [],
+  done = noop,
+) => {
+  const mutations = [];
+  const actions = [];
+
+  // mock commit
+  const commit = (type, mutationPayload) => {
+    const mutation = { type };
+
+    if (typeof mutationPayload !== 'undefined') {
+      mutation.payload = mutationPayload;
+    }
+
+    mutations.push(mutation);
+  };
+
+  // mock dispatch
+  const dispatch = (type, actionPayload) => {
+    const dispatchedAction = { type };
+
+    if (typeof actionPayload !== 'undefined') {
+      dispatchedAction.payload = actionPayload;
+    }
+
+    actions.push(dispatchedAction);
+  };
+
+  const validateResults = () => {
+    expect({
+      mutations,
+      actions,
+    }).toEqual({
+      mutations: expectedMutations,
+      actions: expectedActions,
+    });
+    done();
+  };
+
+  const result = action(
+    { commit, state, dispatch, rootState: state, rootGetters: state, getters: state },
+    payload,
+  );
+
+  return new Promise(resolve => {
+    setImmediate(resolve);
+  })
+    .then(() => result)
+    .catch(error => {
+      validateResults();
+      throw error;
+    })
+    .then(data => {
+      validateResults();
+      return data;
+    });
+};

spec/frontend/helpers/wait_for_attribute_change.js

+export default (domElement, attributes, timeout = 1500) =>
+  new Promise((resolve, reject) => {
+    let observer;
+    const timeoutId = setTimeout(() => {
+      observer.disconnect();
+      reject(new Error(`Could not see an attribute update within ${timeout} ms`));
+    }, timeout);
+
+    observer = new MutationObserver(() => {
+      clearTimeout(timeoutId);
+      observer.disconnect();
+      resolve();
+    });
+
+    observer.observe(domElement, { attributes: true, attributeFilter: attributes });
+  });

spec/frontend/helpers/wait_for_promises.js

+export default () => new Promise(resolve => requestAnimationFrame(resolve));