Migrate related items tree specs to Jest

ee/spec/javascripts/related_items_tree/components/related_items_tree_header_spec.js → ee/spec/frontend/related_items_tree/components/related_items_tree_header_spec.js

@@ -8,7 +8,10 @@ import * as epicUtils from 'ee/related_items_tree/utils/epic_utils';
 import { issuableTypesMap } from 'ee/related_issues/constants';
 import EpicActionsSplitButton from 'ee/related_items_tree/components/epic_actions_split_button.vue';
 
-import { mockParentItem, mockQueryResponse } from '../mock_data';
+import {
+  mockParentItem,
+  mockQueryResponse,
+} from '../../../javascripts/related_items_tree/mock_data';
 
 const createComponent = ({ slots } = {}) => {
   const store = createDefaultStore();

ee/spec/javascripts/related_items_tree/components/tree_item_body_spec.js → ee/spec/frontend/related_items_tree/components/tree_item_body_spec.js

@@ -14,7 +14,12 @@ import createDefaultStore from 'ee/related_items_tree/store';
 import * as epicUtils from 'ee/related_items_tree/utils/epic_utils';
 import { ChildType, ChildState } from 'ee/related_items_tree/constants';
 
-import { mockParentItem, mockInitialConfig, mockQueryResponse, mockIssue1 } from '../mock_data';
+import {
+  mockParentItem,
+  mockInitialConfig,
+  mockQueryResponse,
+  mockIssue1,
+} from '../../../javascripts/related_items_tree/mock_data';
 
 const mockItem = Object.assign({}, mockIssue1, {
   type: ChildType.Issue,
@@ -272,7 +277,7 @@ describe('RelatedItemsTree', () => {
     describe('methods', () => {
       describe('handleRemoveClick', () => {
         it('calls `setRemoveItemModalProps` action with params `parentItem` and `item`', () => {
-          spyOn(wrapper.vm, 'setRemoveItemModalProps');
+          jest.spyOn(wrapper.vm, 'setRemoveItemModalProps');
 
           wrapper.vm.handleRemoveClick();
 

ee/spec/javascripts/related_items_tree/components/tree_item_spec.js → ee/spec/frontend/related_items_tree/components/tree_item_spec.js

@@ -11,7 +11,11 @@ import createDefaultStore from 'ee/related_items_tree/store';
 import * as epicUtils from 'ee/related_items_tree/utils/epic_utils';
 import { ChildType } from 'ee/related_items_tree/constants';
 
-import { mockParentItem, mockQueryResponse, mockEpic1 } from '../mock_data';
+import {
+  mockParentItem,
+  mockQueryResponse,
+  mockEpic1,
+} from '../../../javascripts/related_items_tree/mock_data';
 
 const mockItem = Object.assign({}, mockEpic1, {
   type: ChildType.Epic,
@@ -114,7 +118,7 @@ describe('RelatedItemsTree', () => {
     describe('methods', () => {
       describe('handleChevronClick', () => {
         it('calls `toggleItem` action with `item` as a param', () => {
-          spyOn(wrapper.vm, 'toggleItem');
+          jest.spyOn(wrapper.vm, 'toggleItem');
 
           wrapper.vm.handleChevronClick();
 

spec/frontend/environment.js

@@ -41,6 +41,12 @@ class CustomEnvironment extends JSDOMEnvironment {
     this.global.fixturesBasePath = `${ROOT_PATH}/tmp/tests/frontend/fixtures${IS_EE ? '-ee' : ''}`;
     this.global.staticFixturesBasePath = `${ROOT_PATH}/spec/frontend/fixtures`;
 
+    /**
+     * window.fetch() is required by the apollo-upload-client library otherwise
+     * a ReferenceError is generated: https://github.com/jaydenseric/apollo-upload-client/issues/100
+     */
+    this.global.fetch = () => {};
+
     // Not yet supported by JSDOM: https://github.com/jsdom/jsdom/issues/317
     this.global.document.createRange = () => ({
       setStart: () => {},