fix last lints

spec/javascripts/blob/notebook/index_spec.js

@@ -84,9 +84,14 @@ describe('iPython notebook renderer', () => {
   describe('error in JSON response', () => {
     let mock;
 
-    beforeEach((done) => {
+    beforeEach(done => {
       mock = new MockAdapter(axios);
-      mock.onGet('/test').reply(() => Promise.reject({ status: 200, data: '{ "cells": [{"cell_type": "markdown"} }' }));
+      mock
+        .onGet('/test')
+        .reply(() =>
+          // eslint-disable-next-line prefer-promise-reject-errors
+          Promise.reject({ status: 200, data: '{ "cells": [{"cell_type": "markdown"} }' }),
+        );
 
       renderNotebook();
 

spec/javascripts/commit/commit_pipeline_status_component_spec.js

@@ -75,10 +75,7 @@ describe('Commit pipeline status component', () => {
   describe('When polling data was not succesful', () => {
     beforeEach(() => {
       mock = new MockAdapter(axios);
-      mock.onGet('/dummy/endpoint').reply(() => {
-        const res = Promise.reject([502, { }]);
-        return res;
-      });
+      mock.onGet('/dummy/endpoint').reply(502, {});
       vm = new Component({
         props: {
           endpoint: '/dummy/endpoint',

spec/javascripts/sidebar/confidential_issue_sidebar_spec.js

@@ -8,10 +8,7 @@ describe('Confidential Issue Sidebar Block', () => {
   beforeEach(() => {
     const Component = Vue.extend(confidentialIssueSidebar);
     const service = {
-      update: () => new Promise((resolve, reject) => {
-        resolve(true);
-        reject('failed!');
-      }),
+      update: () => Promise.resolve(true),
     };
 
     vm1 = new Component({