tc32-not-implement-Selection-API

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

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-33
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 (63ms)

  ● AppComponent › should create the app

    TypeError: window.getSelection is not a function

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

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

Test Suites: 1 failed, 1 total
Tests:       1 failed, 1 total
Snapshots:   0 total
Time:        2.417s

Expected

Expect getSelection is defined

Description

Since JSDOM doesn't implement Selection API, that means jest is not suitable for testing web editors

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