GitHub - SafirJMT/testUsingJest: Use jest module to test js function

Navigate to the folder where the index.html file is in a CLI of your choice (cmd/PowerShell/GitBash/...)
npm install

This should install a lot of files under "node_modules" folder.
npm test

Expected output:
```
 > persisted@1.0.0 test
 > jest
 
  PASS  ./numberService.test.js
   NumberService
     √ should return a number (2 ms)
 
 Test Suites: 1 passed, 1 total
 Tests:       1 passed, 1 total
 Snapshots:   0 total
 Time:        1.45 s
 Ran all test suites.
```
1. To run the project you will need to run a local server to avoid CORS issues. I suggest using Visual Studio Code.
2. Install the VSCode Extension "Live Server"
3. open up the "index.html" and right click within the file to "Open with Live Server"
4. This should open up something like http://127.0.0.1:5500/index.html
5. Clicking "Generate Number" should show a number below the button

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