[ci skip] Adds unit tests for issue_note_header component

app/assets/javascripts/notes/components/issue_note_header.vue

@@ -34,6 +34,7 @@
       toggleHandler: {
         type: Function,
         required: false,
+        default: () => {},
       },
     },
     data() {
@@ -102,7 +103,7 @@
       class="discussion-actions">
       <button
         @click="handleToggle"
-        class="note-action-button discussion-toggle-button js-toggle-button"
+        class="note-action-button discussion-toggle-button js-vue-toggle-button"
         type="button">
           <i
             :class="toggleChevronClass"

spec/javascripts/notes/components/issue_note_header_spec.js

+import Vue from 'vue';
+import issueNoteHeader from '~/notes/components/issue_note_header.vue';
+import store from '~/notes/stores';
+
 describe('issue_note_header component', () => {
-  it('should render user information', () => {
+  let vm;
+  let Component;
 
+  beforeEach(() => {
+    Component = Vue.extend(issueNoteHeader);
   });
 
-  it('should render timestamp link', () => {
+  afterEach(() => {
+    vm.$destroy();
+  });
 
+  describe('individual note', () => {
+    beforeEach(() => {
+      vm = new Component({
+        store,
+        propsData: {
+          actionText: 'commented',
+          actionTextHtml: '',
+          author: {
+            avatar_url: null,
+            id: 1,
+            name: 'Root',
+            path: '/root',
+            state: 'active',
+            username: 'root',
+          },
+          createdAt: '2017-08-02T10:51:58.559Z',
+          includeToggle: false,
+          noteId: 1394,
+        },
+      }).$mount();
+    });
+
+    it('should render user information', () => {
+      expect(
+        vm.$el.querySelector('.note-header-author-name').textContent.trim(),
+      ).toEqual('Root');
+      expect(
+        vm.$el.querySelector('.note-header-info a').getAttribute('href'),
+      ).toEqual('/root');
+    });
+
+    it('should render timestamp link', () => {
+      expect(vm.$el.querySelector('a[href="#note_1394"]')).toBeDefined();
+    });
   });
 
   describe('discussion', () => {
+    beforeEach(() => {
+      vm = new Component({
+        store,
+        propsData: {
+          actionText: 'started a discussion',
+          actionTextHtml: '',
+          author: {
+            avatar_url: null,
+            id: 1,
+            name: 'Root',
+            path: '/root',
+            state: 'active',
+            username: 'root',
+          },
+          createdAt: '2017-08-02T10:51:58.559Z',
+          includeToggle: true,
+          noteId: 1395,
+        },
+      }).$mount();
+    });
+
     it('should render toggle button', () => {
+      expect(vm.$el.querySelector('.js-vue-toggle-button')).toBeDefined();
+    });
+
+    it('should toggle the disucssion icon', (done) => {
+      expect(
+        vm.$el.querySelector('.js-vue-toggle-button i').classList.contains('fa-chevron-up'),
+      ).toEqual(true);
 
+      vm.$el.querySelector('.js-vue-toggle-button').click();
+
+      Vue.nextTick(() => {
+        expect(
+          vm.$el.querySelector('.js-vue-toggle-button i').classList.contains('fa-chevron-down'),
+        ).toEqual(true);
+        done();
+      });
     });
   });
 });

spec/javascripts/notes/components/issue_placeholder_note_spec.js

@@ -15,6 +15,10 @@ describe('issue placeholder system note component', () => {
     }).$mount();
   });
 
+  afterEach(() => {
+    vm.$destroy();
+  });
+
   describe('user information', () => {
     it('should render user avatar with link', () => {
       expect(vm.$el.querySelector('.user-avatar-link').getAttribute('href')).toEqual(userDataMock.path);