diff --git a/spec/javascripts/sidebar/user_mock_data.js b/spec/javascripts/helpers/user_mock_data_helper.js
similarity index 75%
rename from spec/javascripts/sidebar/user_mock_data.js
rename to spec/javascripts/helpers/user_mock_data_helper.js
index 9e7b8346238..a9783ea065c 100644
--- a/spec/javascripts/sidebar/user_mock_data.js
+++ b/spec/javascripts/helpers/user_mock_data_helper.js
@@ -4,7 +4,7 @@ export default {
     for (let i = 0; i < numberUsers; i = i += 1) {
       users.push(
         {
-          avatarUrl: 'http://gravatar.com/avatar/e64c7d89f26bd1972efa854d13d7dd61?s=80&d=identicon',
+          avatar: 'http://gravatar.com/avatar/e64c7d89f26bd1972efa854d13d7dd61?s=80&d=identicon',
           id: (i + 1),
           name: `GitLab User ${i}`,
           username: `gitlab${i}`,
diff --git a/spec/javascripts/sidebar/assignees_spec.js b/spec/javascripts/sidebar/assignees_spec.js
index cf47940ef1c..c9453a21189 100644
--- a/spec/javascripts/sidebar/assignees_spec.js
+++ b/spec/javascripts/sidebar/assignees_spec.js
@@ -1,7 +1,7 @@
 import Vue from 'vue';
 import Assignee from '~/sidebar/components/assignees/assignees';
 import UsersMock from './mock_data';
-import UsersMockHelper from '../test_helpers/user_mock_data';
+import UsersMockHelper from '../helpers/user_mock_data_helper';
 
 describe('Assignee component', () => {
   let component;
@@ -86,7 +86,7 @@ describe('Assignee component', () => {
       const collapsed = component.$el.querySelector('.sidebar-collapsed-icon');
       const assignee = collapsed.children[0];
       expect(collapsed.childElementCount).toEqual(1);
-      expect(assignee.querySelector('.avatar').getAttribute('src')).toEqual(UsersMock.user.avatarUrl);
+      expect(assignee.querySelector('.avatar').getAttribute('src')).toEqual(UsersMock.user.avatar);
       expect(assignee.querySelector('.avatar').getAttribute('alt')).toEqual(`${UsersMock.user.name}'s avatar`);
       expect(assignee.querySelector('.author').innerText.trim()).toEqual(UsersMock.user.name);
     });
@@ -104,7 +104,7 @@ describe('Assignee component', () => {
 
       expect(component.$el.querySelector('.author_link')).not.toBeNull();
       // The image
-      expect(component.$el.querySelector('.author_link img').getAttribute('src')).toEqual(UsersMock.user.avatarUrl);
+      expect(component.$el.querySelector('.author_link img').getAttribute('src')).toEqual(UsersMock.user.avatar);
       // Author name
       expect(component.$el.querySelector('.author_link .author').innerText.trim()).toEqual(UsersMock.user.name);
       // Username
@@ -141,12 +141,12 @@ describe('Assignee component', () => {
       expect(collapsed.childElementCount).toEqual(2);
 
       const first = collapsed.children[0];
-      expect(first.querySelector('.avatar').getAttribute('src')).toEqual(users[0].avatarUrl);
+      expect(first.querySelector('.avatar').getAttribute('src')).toEqual(users[0].avatar);
       expect(first.querySelector('.avatar').getAttribute('alt')).toEqual(`${users[0].name}'s avatar`);
       expect(first.querySelector('.author').innerText.trim()).toEqual(users[0].name);
 
       const second = collapsed.children[1];
-      expect(second.querySelector('.avatar').getAttribute('src')).toEqual(users[1].avatarUrl);
+      expect(second.querySelector('.avatar').getAttribute('src')).toEqual(users[1].avatar);
       expect(second.querySelector('.avatar').getAttribute('alt')).toEqual(`${users[1].name}'s avatar`);
       expect(second.querySelector('.author').innerText.trim()).toEqual(users[1].name);
     });
@@ -165,7 +165,7 @@ describe('Assignee component', () => {
       expect(collapsed.childElementCount).toEqual(2);
 
       const first = collapsed.children[0];
-      expect(first.querySelector('.avatar').getAttribute('src')).toEqual(users[0].avatarUrl);
+      expect(first.querySelector('.avatar').getAttribute('src')).toEqual(users[0].avatar);
       expect(first.querySelector('.avatar').getAttribute('alt')).toEqual(`${users[0].name}'s avatar`);
       expect(first.querySelector('.author').innerText.trim()).toEqual(users[0].name);
 
diff --git a/spec/javascripts/sidebar/mock_data.js b/spec/javascripts/sidebar/mock_data.js
index 0599a63912c..9fc8667ecc9 100644
--- a/spec/javascripts/sidebar/mock_data.js
+++ b/spec/javascripts/sidebar/mock_data.js
@@ -93,7 +93,7 @@ export default {
     human_total_time_spent: null,
   },
   user: {
-    avatarUrl: 'http://gravatar.com/avatar/e64c7d89f26bd1972efa854d13d7dd61?s=80&d=identicon',
+    avatar: 'http://gravatar.com/avatar/e64c7d89f26bd1972efa854d13d7dd61?s=80&d=identicon',
     id: 1,
     name: 'Administrator',
     username: 'root',
diff --git a/spec/javascripts/sidebar/sidebar_mediator_spec.js b/spec/javascripts/sidebar/sidebar_mediator_spec.js
index 9bfca0c0991..2b00fa17334 100644
--- a/spec/javascripts/sidebar/sidebar_mediator_spec.js
+++ b/spec/javascripts/sidebar/sidebar_mediator_spec.js
@@ -24,10 +24,12 @@ describe('Sidebar mediator', () => {
   });
 
   it('saves assignees', (done) => {
-    this.mediator.saveAssignees('issue[assignee_ids]').then((resp) => {
-      expect(resp.status).toEqual(200);
-      done();
-    });
+    this.mediator.saveAssignees('issue[assignee_ids]')
+      .then((resp) => {
+        expect(resp.status).toEqual(200);
+        done();
+      })
+      .catch(() => {});
   });
 
   it('fetches the data', () => {
diff --git a/spec/javascripts/sidebar/sidebar_service_spec.js b/spec/javascripts/sidebar/sidebar_service_spec.js
index ed7be76dbcc..d41162096a6 100644
--- a/spec/javascripts/sidebar/sidebar_service_spec.js
+++ b/spec/javascripts/sidebar/sidebar_service_spec.js
@@ -13,16 +13,20 @@ describe('Sidebar service', () => {
   });
 
   it('gets the data', (done) => {
-    this.service.get().then((resp) => {
-      expect(resp).toBeDefined();
-      done();
-    });
+    this.service.get()
+      .then((resp) => {
+        expect(resp).toBeDefined();
+        done();
+      })
+      .catch(() => {});
   });
 
   it('updates the data', (done) => {
-    this.service.update('issue[assignee_ids]', [1]).then((resp) => {
-      expect(resp).toBeDefined();
-      done();
-    });
+    this.service.update('issue[assignee_ids]', [1])
+      .then((resp) => {
+        expect(resp).toBeDefined();
+        done();
+      })
+      .catch(() => {});
   });
 });
diff --git a/spec/javascripts/sidebar/sidebar_store_spec.js b/spec/javascripts/sidebar/sidebar_store_spec.js
index 6c0f2b6a793..29facf483b5 100644
--- a/spec/javascripts/sidebar/sidebar_store_spec.js
+++ b/spec/javascripts/sidebar/sidebar_store_spec.js
@@ -1,6 +1,6 @@
 import SidebarStore from '~/sidebar/stores/sidebar_store';
 import Mock from './mock_data';
-import UsersMockHelper from '../test_helpers/user_mock_data';
+import UsersMockHelper from '../helpers/user_mock_data_helper';
 
 describe('Sidebar store', () => {
   const assignee = {