diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
index 8cd5107f..9daca5cb 100644
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@@ -50,11 +50,13 @@ $ npm run unit
 
 # run e2e tests
 $ npm run e2e
+# Make sure you have created bundle before running e2e test
+# E.g. run `npm run bundle` and wait for the finishing process.
 
 # open cypress UI to debug e2e test
 $ npm run cy:open
 
-# run the full test suite, include linting / unit / e2e
+# run the unit tests (includes linting and license checks)
 $ npm test
 
 # prepare bundles
diff --git a/e2e/integration/menu.e2e.ts b/e2e/integration/menu.e2e.ts
index 511baca7..f21aebc6 100644
--- a/e2e/integration/menu.e2e.ts
+++ b/e2e/integration/menu.e2e.ts
@@ -6,7 +6,7 @@ describe('Menu', () => {
   it('should have valid items count', () => {
     cy.get('.menu-content')
       .find('li')
-      .should('have.length', 6 + (2 + 8 + 1 + 4 + 2) + (1 + 8));
+      .should('have.length', 6 + (2 + 8 + 1 + 4 + 2) + (1 + 8) + 1);
   });
 
   it('should sync active menu items while scroll', () => {
diff --git a/tests/e2e/redoc.e2e.js b/tests/e2e/redoc.e2e.js
index f453e9c2..b9ef55de 100644
--- a/tests/e2e/redoc.e2e.js
+++ b/tests/e2e/redoc.e2e.js
@@ -8,9 +8,9 @@ const getInnerHtml = require('./helpers').getInnerHtml;
 const URL = 'index.html';
 
 function waitForInit() {
-  var EC = protractor.ExpectedConditions;
-  var $apiInfo = $('api-info');
-  var $errorMessage = $('.redoc-error')
+  const EC = protractor.ExpectedConditions;
+  const $apiInfo = $('api-info');
+  const $errorMessage = $('.redoc-error');
   browser.wait(EC.or(EC.visibilityOf($apiInfo), EC.visibilityOf($errorMessage)), 60000);
 }
 
@@ -21,7 +21,7 @@ function basicTests(swaggerUrl, title) {
       specUrl += `?url=${encodeURIComponent(swaggerUrl)}`;
     }
 
-    beforeEach((done) => {
+    beforeEach(done => {
       browser.get(specUrl);
       waitForInit();
       fixFFTest(done);
@@ -31,11 +31,11 @@ function basicTests(swaggerUrl, title) {
       verifyNoBrowserErrors();
     });
 
-    it('should init redoc without errors', (done) => {
-      let $redoc = $('redoc');
+    it('should init redoc without errors', done => {
+      const $redoc = $('redoc');
       expect($redoc.isPresent()).toBe(true);
       setTimeout(() => {
-        let $operations = $$('operation');
+        const $operations = $$('operation');
         expect($operations.count()).toBeGreaterThan(0);
         done();
       });
@@ -45,11 +45,10 @@ function basicTests(swaggerUrl, title) {
 
 basicTests(null, 'Extended Petstore');
 
-
 describe('Scroll sync', () => {
-  let specUrl = URL;
+  const specUrl = URL;
 
-  beforeEach((done) => {
+  beforeEach(done => {
     browser.get(specUrl);
     waitForInit();
     fixFFTest(done);
@@ -57,25 +56,31 @@ describe('Scroll sync', () => {
 
   it('should update active menu entries on page scroll forwards', () => {
     scrollToEl('[section="tag/store"]').then(() => {
-      expect(getInnerHtml('.menu-item.menu-item-depth-1.active > .menu-item-header')).toContain('store');
+      expect(getInnerHtml('.menu-item.menu-item-depth-1.active > .menu-item-header')).toContain(
+        'store',
+      );
       expect(getInnerHtml('.selected-tag')).toContain('store');
     });
   });
 
   it('should update active menu entries on page scroll backwards', () => {
     scrollToEl('[operation-id="getPetById"]').then(() => {
-      expect(getInnerHtml('.menu-item.menu-item-depth-1.active .menu-item-header')).toContain('pet');
+      expect(getInnerHtml('.menu-item.menu-item-depth-1.active .menu-item-header')).toContain(
+        'pet',
+      );
       expect(getInnerHtml('.selected-tag')).toContain('pet');
-      expect(getInnerHtml('.menu-item.menu-item-depth-2.active .menu-item-header')).toContain('Find pet by ID');
+      expect(getInnerHtml('.menu-item.menu-item-depth-2.active .menu-item-header')).toContain(
+        'Find pet by ID',
+      );
       expect(getInnerHtml('.selected-endpoint')).toContain('Find pet by ID');
     });
   });
 });
 
 describe('Language tabs sync', () => {
-  let specUrl = URL;
+  const specUrl = URL;
 
-  beforeEach((done) => {
+  beforeEach(done => {
     browser.get(specUrl);
     waitForInit();
     fixFFTest(done);
@@ -84,10 +89,10 @@ describe('Language tabs sync', () => {
   // skip as it fails for no reason on IE on sauce-labs
   // TODO: fixme
   xit('should sync language tabs', () => {
-    var $item = $$('[operation-id="addPet"] tabs > ul > li').last();
+    const $item = $$('[operation-id="addPet"] tabs > ul > li').last();
     // check if correct item
     expect($item.getText()).toContain('PHP');
-    var EC = protractor.ExpectedConditions;
+    const EC = protractor.ExpectedConditions;
     browser.wait(EC.elementToBeClickable($item), 5000);
     $item.click().then(() => {
       expect($('[operation-id="updatePet"] li.active').getText()).toContain('PHP');
@@ -96,8 +101,7 @@ describe('Language tabs sync', () => {
 });
 
 if (process.env.JOB === 'e2e-guru') {
-  describe('APIs.guru specs test', ()=> {
-
+  describe('APIs.guru specs test', () => {
     // global.apisGuruList was loaded in onPrepare method of protractor config
     let apisGuruList = global.apisGuruList;
 
@@ -118,11 +122,11 @@ if (process.env.JOB === 'e2e-guru') {
       console.log('Running on a short APIs guru list');
       apisGuruList = eachNth(apisGuruList, 20);
     } else {
-      console.log('Running on full APIs guru list')
+      console.log('Running on full APIs guru list');
     }
 
-    for (let apiName of Object.keys(apisGuruList)) {
-      let apiInfo = apisGuruList[apiName].versions[apisGuruList[apiName].preferred];
+    for (const apiName of Object.keys(apisGuruList)) {
+      const apiInfo = apisGuruList[apiName].versions[apisGuruList[apiName].preferred];
       let url = apiInfo.swaggerUrl;
 
       // temporary hack due to this issue: https://github.com/substack/https-browserify/issues/6