ASP.NET Core 3 and React

Getting started with Jest

Jest is the de-facto testing tool in the React community and is maintained by Facebook. Jest is included in Create React App (CRA) projects, which means that it is already installed and configured in our project. We'll start to get familiar with Jest by adding some unit tests on the required function in the Form component. So, let's open our frontend project in Visual Studio Code and carry out the following steps:

1. Create a new file called Form.test.ts in the src folder that contains the following content:

import { required } from './Form';test('When required is called with empty string, an error should be returned', () => {  // TODO - call required passing in an empty string // TODO - check that an error is returned ...