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diff --git a/spec/javascripts/ide/components/activity_bar_spec.js b/spec/javascripts/ide/components/activity_bar_spec.js
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index 00000000000..946c7e8e9c8
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+++ b/spec/javascripts/ide/components/activity_bar_spec.js
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+import Vue from 'vue';
+import store from '~/ide/stores';
+import { activityBarViews } from '~/ide/constants';
+import ActivityBar from '~/ide/components/activity_bar.vue';
+import { createComponentWithStore } from '../../helpers/vue_mount_component_helper';
+import { resetStore } from '../helpers';
+
+describe('IDE activity bar', () => {
+  const Component = Vue.extend(ActivityBar);
+  let vm;
+
+  beforeEach(() => {
+    Vue.set(store.state.projects, 'abcproject', {
+      web_url: 'testing',
+    });
+    Vue.set(store.state, 'currentProjectId', 'abcproject');
+
+    vm = createComponentWithStore(Component, store);
+  });
+
+  afterEach(() => {
+    vm.$destroy();
+
+    resetStore(vm.$store);
+  });
+
+  describe('goBackUrl', () => {
+    it('renders the Go Back link with the referrer when present', () => {
+      const fakeReferrer = '/example/README.md';
+      spyOnProperty(document, 'referrer').and.returnValue(fakeReferrer);
+
+      vm.$mount();
+
+      expect(vm.goBackUrl).toEqual(fakeReferrer);
+    });
+
+    it('renders the Go Back link with the project url when referrer is not present', () => {
+      const fakeReferrer = '';
+      spyOnProperty(document, 'referrer').and.returnValue(fakeReferrer);
+
+      vm.$mount();
+
+      expect(vm.goBackUrl).toEqual('testing');
+    });
+  });
+
+  describe('updateActivityBarView', () => {
+    beforeEach(() => {
+      spyOn(vm, 'updateActivityBarView');
+
+      vm.$mount();
+    });
+
+    it('calls updateActivityBarView with edit value on click', () => {
+      vm.$el.querySelector('.js-ide-edit-mode').click();
+
+      expect(vm.updateActivityBarView).toHaveBeenCalledWith(activityBarViews.edit);
+    });
+
+    it('calls updateActivityBarView with commit value on click', () => {
+      vm.$el.querySelector('.js-ide-commit-mode').click();
+
+      expect(vm.updateActivityBarView).toHaveBeenCalledWith(activityBarViews.commit);
+    });
+
+    it('calls updateActivityBarView with review value on click', () => {
+      vm.$el.querySelector('.js-ide-review-mode').click();
+
+      expect(vm.updateActivityBarView).toHaveBeenCalledWith(activityBarViews.review);
+    });
+  });
+
+  describe('active item', () => {
+    beforeEach(() => {
+      vm.$mount();
+    });
+
+    it('sets edit item active', () => {
+      expect(vm.$el.querySelector('.js-ide-edit-mode').classList).toContain('active');
+    });
+
+    it('sets commit item active', done => {
+      vm.$store.state.currentActivityView = activityBarViews.commit;
+
+      vm.$nextTick(() => {
+        expect(vm.$el.querySelector('.js-ide-commit-mode').classList).toContain('active');
+
+        done();
+      });
+    });
+  });
+});