Below are the packages and command which need to be installed for unit testing in reactjs app.
yarn add jest enzyme react-test-renderer enzyme-adapter-react-16
I have used several packages which are:
Jest is a delightful JavaScript Testing Framework with a focus on simplicity.
Enzyme is a JavaScript Testing utility for React that makes it easier to test React Components' output.
React renderer that can be used to render React components to pure JavaScript objects, without depending on the DOM or a native mobile environment.
Enzyme adapter has peer dependencies on react and react-dom.
