tc54-not-support-execCommand-api

Test Case: JSDOM doesn't support execCommand api

Test Case Code

https://drive.google.com/file/d/1dkFjRWnYFVho75eq61iwFunB-qDSKgeB/view?usp=sharing

// check file
app.component.spec.ts

Topcoder handle

applehit16

Your document content (required)

How to run test

Prerequisites

1. Node 8+
2. NPM or yarn
3. Git
4. Safari, Chrome, Firefox

Run Test on Karma

cd topcoder-jest-test
git checkout issue-61
npm install
npm run test

Run Test on Jest

npm run test:jest

Browser have tested

Chrome, Safari, Firefox

Test Result on Karma

Browser	Result
Chrome 72.0.3626 (Mac OS X 10.14.2)	success
Safari 11.1.0 (Mac OS X 10.14.2)	success
Firefox 65.0.0 (Mac OS X 10.14.2)	success

Test Result on Jest

What we get

 FAIL  src/app/app.component.spec.ts
  AppComponent
    ✕ should create the app (57ms)

  ● AppComponent › should create the app

    AssertionError: expected undefined to be an instance of Function

      17 |
      18 |   it('should create the app', () => {
    > 19 |     expect(document.execCommand).to.be.instanceOf(Function);
         |                                        ^
      20 |   });
      21 | });
      22 |

      at src/app/app.component.spec.ts:19:40

Test Suites: 1 failed, 1 total
Tests:       1 failed, 1 total
Snapshots:   0 total
Time:        2.309s, estimated 3s
Ran all test suites.
npm ERR! code ELIFECYCLE

Expected

Expect execCommand to be defined in JSDOM

Description

web standard: https://developer.mozilla.org/en-US/docs/Web/API/Document/execCommand

jsdom issue: jsdom/jsdom#1742