Projects Dropdown Frequent Projects List Component Spec

spec/javascripts/projects_dropdown/components/projects_list_frequent_spec.js

+import Vue from 'vue';
+
+import projectsListFrequentComponent from '~/projects_dropdown/components/projects_list_frequent.vue';
+
+import mountComponent from '../../helpers/vue_mount_component_helper';
+import { mockFrequents } from '../mock_data';
+
+const createComponent = () => {
+  const Component = Vue.extend(projectsListFrequentComponent);
+
+  return mountComponent(Component, {
+    projects: mockFrequents,
+    localStorageFailed: false,
+  });
+};
+
+describe('ProjectsListFrequentComponent', () => {
+  let vm;
+
+  beforeEach(() => {
+    vm = createComponent();
+  });
+
+  afterEach(() => {
+    vm.$destroy();
+  });
+
+  describe('computed', () => {
+    describe('isListEmpty', () => {
+      it('should return `true` or `false` representing whether if `projects` is empty of not', () => {
+        vm.projects = [];
+        expect(vm.isListEmpty).toBeTruthy();
+
+        vm.projects = mockFrequents;
+        expect(vm.isListEmpty).toBeFalsy();
+      });
+    });
+
+    describe('listEmptyMessage', () => {
+      it('should return appropriate empty list message based on value of `localStorageFailed` prop', () => {
+        vm.localStorageFailed = true;
+        expect(vm.listEmptyMessage).toBe('This feature requires browser localStorage support');
+
+        vm.localStorageFailed = false;
+        expect(vm.listEmptyMessage).toBe('Projects you visit often will appear here');
+      });
+    });
+  });
+
+  describe('template', () => {
+    it('should render component element with list of projects', (done) => {
+      vm.projects = mockFrequents;
+
+      Vue.nextTick(() => {
+        expect(vm.$el.classList.contains('projects-list-frequent-container')).toBeTruthy();
+        expect(vm.$el.querySelectorAll('ul.list-unstyled').length).toBe(1);
+        expect(vm.$el.querySelectorAll('li.projects-list-item-container').length).toBe(5);
+        done();
+      });
+    });
+
+    it('should render component element with empty message', (done) => {
+      vm.projects = [];
+
+      Vue.nextTick(() => {
+        expect(vm.$el.querySelectorAll('li.section-empty').length).toBe(1);
+        expect(vm.$el.querySelectorAll('li.projects-list-item-container').length).toBe(0);
+        done();
+      });
+    });
+  });
+});