Merge branch 'ss/mv-sidebar-assigness-to-jest' into 'master'

Mv sidebar assignee from karma to jest

See merge request gitlab-org/gitlab!29461

spec/javascripts/sidebar/sidebar_assignees_spec.js → spec/frontend/sidebar/sidebar_assignees_spec.js

-import Vue from 'vue';
-import mountComponent from 'spec/helpers/vue_mount_component_helper';
+import { shallowMount } from '@vue/test-utils';
+import AxiosMockAdapter from 'axios-mock-adapter';
+import axios from 'axios';
 import SidebarAssignees from '~/sidebar/components/assignees/sidebar_assignees.vue';
+import Assigness from '~/sidebar/components/assignees/assignees.vue';
 import SidebarMediator from '~/sidebar/sidebar_mediator';
 import SidebarService from '~/sidebar/services/sidebar_service';
 import SidebarStore from '~/sidebar/stores/sidebar_store';
 import Mock from './mock_data';
 
 describe('sidebar assignees', () => {
-  let vm;
+  let wrapper;
   let mediator;
-  let sidebarAssigneesEl;
-  preloadFixtures('issues/open-issue.html');
+  let axiosMock;
 
-  beforeEach(() => {
-    loadFixtures('issues/open-issue.html');
-
-    mediator = new SidebarMediator(Mock.mediator);
-    spyOn(mediator, 'saveAssignees').and.callThrough();
-    spyOn(mediator, 'assignYourself').and.callThrough();
-
-    const SidebarAssigneeComponent = Vue.extend(SidebarAssignees);
-    sidebarAssigneesEl = document.querySelector('#js-vue-sidebar-assignees');
-    vm = mountComponent(
-      SidebarAssigneeComponent,
-      {
+  const createComponent = () => {
+    wrapper = shallowMount(SidebarAssignees, {
+      propsData: {
         mediator,
-        field: sidebarAssigneesEl.dataset.field,
+        field: '',
       },
-      sidebarAssigneesEl,
-    );
+      // Attaching to document is required because this component emits something from the parent element :/
+      attachToDocument: true,
+    });
+  };
+
+  beforeEach(() => {
+    axiosMock = new AxiosMockAdapter(axios);
+    mediator = new SidebarMediator(Mock.mediator);
+
+    jest.spyOn(mediator, 'saveAssignees');
+    jest.spyOn(mediator, 'assignYourself');
+
+    createComponent();
   });
 
   afterEach(() => {
+    wrapper.destroy();
+    wrapper = null;
+
     SidebarService.singleton = null;
     SidebarStore.singleton = null;
     SidebarMediator.singleton = null;
+    axiosMock.restore();
   });
 
   it('calls the mediator when saves the assignees', () => {
-    vm.saveAssignees();
+    expect(mediator.saveAssignees).not.toHaveBeenCalled();
+
+    wrapper.vm.saveAssignees();
 
     expect(mediator.saveAssignees).toHaveBeenCalled();
   });
 
   it('calls the mediator when "assignSelf" method is called', () => {
-    vm.assignSelf();
+    expect(mediator.assignYourself).not.toHaveBeenCalled();
+    expect(mediator.store.assignees.length).toBe(0);
+
+    wrapper.vm.assignSelf();
 
     expect(mediator.assignYourself).toHaveBeenCalled();
-    expect(mediator.store.assignees.length).toEqual(1);
+    expect(mediator.store.assignees.length).toBe(1);
   });
 
-  it('hides assignees until fetched', done => {
-    const currentAssignee = sidebarAssigneesEl.querySelector('.value');
+  it('hides assignees until fetched', () => {
+    expect(wrapper.find(Assigness).exists()).toBe(false);
 
-    expect(currentAssignee).toBe(null);
+    wrapper.vm.store.isFetching.assignees = false;
 
-    vm.store.isFetching.assignees = false;
-    Vue.nextTick(() => {
-      expect(vm.$el.querySelector('.value')).toBeVisible();
-      done();
+    return wrapper.vm.$nextTick(() => {
+      expect(wrapper.find(Assigness).exists()).toBe(true);
     });
   });
 });