tc24-not-support-Image.decode-method

Test Case: [API UNSUPPORTED] - JSDOM doesn't support Image.decode method

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-28
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)	failure

Test Result on Jest

What we get

 FAIL  src/app/app.component.spec.ts
  AppComponent
    ✕ should create the app (88ms)

  ● AppComponent › should create the app

    AssertionError: expected undefined to be an instance of Function

      20 |     const fixture = TestBed.createComponent(AppComponent);
      21 |     const el = fixture.nativeElement.querySelector('#test');
    > 22 |     expect(el.decode).to.be.an.instanceOf(Function);
         |                                ^
      23 |   });
      24 | });
      25 | 

      at src/app/app.component.spec.ts:22:32

Test Suites: 1 failed, 1 total
Tests:       1 failed, 1 total
Snapshots:   0 total
Time:        2.821s, estimated 3s

Expected

Expect JSDOM to support decode method

Description

Both JSDOM anf Firefox doesn't support Image.decode method, But it's supported in Chrome and Safari

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

DOM spec: https://html.spec.whatwg.org/multipage/embedded-content.html#dom-img-decode

issue: jsdom/jsdom#2154