added spec to ide_side_bar

app/assets/javascripts/ide/components/ide_side_bar.vue

 <script>
 import { mapState, mapGetters } from 'vuex';
 import ProjectAvatarImage from '~/vue_shared/components/project_avatar/image.vue';
-import icon from '~/vue_shared/components/icon.vue';
-import panelResizer from '~/vue_shared/components/panel_resizer.vue';
-import skeletonLoadingContainer from '~/vue_shared/components/skeleton_loading_container.vue';
+import Icon from '~/vue_shared/components/icon.vue';
+import PanelResizer from '~/vue_shared/components/panel_resizer.vue';
+import SkeletonLoadingContainer from '~/vue_shared/components/skeleton_loading_container.vue';
 import Identicon from '../../vue_shared/components/identicon.vue';
 import IdeTree from './ide_tree.vue';
 import ResizablePanel from './resizable_panel.vue';
@@ -12,9 +12,9 @@ import CommitSection from './repo_commit_section.vue';
 
 export default {
   components: {
-    icon,
-    panelResizer,
-    skeletonLoadingContainer,
+    Icon,
+    PanelResizer,
+    SkeletonLoadingContainer,
     ResizablePanel,
     ActivityBar,
     ProjectAvatarImage,
@@ -87,11 +87,9 @@ export default {
           </a>
         </div>
         <div class="multi-file-commit-panel-inner-scroll">
-          <keep-alive>
           <component
             :is="activityBarComponent"
           />
-          </keep-alive>
         </div>
       </template>
     </div>

app/assets/javascripts/ide/components/ide_tree.vue

@@ -21,10 +21,9 @@ export default {
 
 <template>
   <div
-    v-if="currentTree"
     class="ide-file-list"
   >
-    <template v-if="currentTree.loading">
+    <template v-if="!currentTree || currentTree.loading">
       <div
         class="multi-file-loading-container"
         v-for="n in 3"

spec/javascripts/ide/components/ide_side_bar_spec.js

 import Vue from 'vue';
 import store from '~/ide/stores';
 import ideSidebar from '~/ide/components/ide_side_bar.vue';
+import { ActivityBarViews } from '~/ide/stores/state';
 import { createComponentWithStore } from 'spec/helpers/vue_mount_component_helper';
 import { resetStore } from '../helpers';
 import { projectData } from '../mock_data';
@@ -13,7 +14,6 @@ describe('IdeSidebar', () => {
 
     store.state.currentProjectId = 'abcproject';
     store.state.projects.abcproject = projectData;
-    store.state.currentActivityView = null;
 
     vm = createComponentWithStore(Component, store).$mount();
   });
@@ -38,4 +38,20 @@ describe('IdeSidebar', () => {
       done();
     });
   });
+
+  describe('activityBarComponent', () => {
+    it('renders tree component', () => {
+      expect(vm.$el.querySelector('.ide-file-list')).not.toBeNull();
+    });
+
+    it('renders commit component', done => {
+      vm.$store.state.currentActivityView = ActivityBarViews.commit;
+
+      vm.$nextTick(() => {
+        expect(vm.$el.querySelector('.multi-file-commit-panel-section')).not.toBeNull();
+
+        done();
+      });
+    });
+  });
 });