Epic Sidebar Participants Component

spec/javascripts/epics/sidebar/components/sidebar_participants_spec.js

+import Vue from 'vue';
+
+import SidebarParticipants from 'ee/epics/sidebar/components/sidebar_participants.vue';
+import mountComponent from 'spec/helpers/vue_mount_component_helper';
+import { mockParticipants } from '../../epic_show/mock_data';
+
+const createComponent = () => {
+  const Component = Vue.extend(SidebarParticipants);
+
+  return mountComponent(Component, {
+    participants: mockParticipants,
+  });
+};
+
+describe('SidebarParticipants', () => {
+  let vm;
+
+  beforeEach(() => {
+    vm = createComponent();
+  });
+
+  afterEach(() => {
+    vm.$destroy();
+  });
+
+  describe('methods', () => {
+    describe('onToggleSidebar', () => {
+      it('emits `toggleCollapse` event on component', () => {
+        spyOn(vm, '$emit');
+        vm.onToggleSidebar();
+        expect(vm.$emit).toHaveBeenCalledWith('toggleCollapse');
+      });
+    });
+  });
+
+  describe('template', () => {
+    it('renders component container element with classes `block participants`', () => {
+      expect(vm.$el.classList.contains('block', 'participants')).toBe(true);
+    });
+
+    it('renders participants list element', () => {
+      expect(vm.$el.querySelector('.participants-list')).not.toBeNull();
+      expect(vm.$el.querySelectorAll('.js-participants-author').length).toBe(mockParticipants.length);
+    });
+  });
+});