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tc20-not-implement-MessageChannel

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Test Case: [API UNSUPPORTED] - JSDOM doesn't implement MessageChannel

Test Case Code

https://drive.google.com/open?id=1IayEFjUReATiuJI8CD6hBQRPGR7iIrFZ

// check file
app.component.spec.ts

Topcoder handle

liqiang372

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-23
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

● AppComponent › should create the app

ReferenceError: MessageChannel is not defined

  17 | 
  18 |   it('should create the app', () => {
> 19 |     const channel = new MessageChannel();
     |                     ^
  20 |     expect(channel).to.be.an.instanceOf(Object);
  21 |   });
  22 | });

  at src/app/app.component.spec.ts:19:21

Test Suites: 1 failed, 1 total Tests: 1 failed, 1 total Snapshots: 0 total Time: 2.756s

Expected

Expect MessageChannel web api to be defined

Description

MessageChannel API is a common feature implemented in mainstream browsers

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

issue: jsdom/jsdom#2448