Setup create-react-app

create-react-app offers an out-of-the-box experience when using Jest and React, it's already configured to allow tests to be written in ES6 and use JSX.

Create the application

npx create-react-app react-testing
cd react-testing

Run the tests

npm test

note: projects created using create-react-app run Jest in watch mode by default when running npm test

when the Jest cli starts press a to run all tests

in this case, create-react-app provides a single smoke test that checks that the application renders into the DOM without crashing

note: this is called a 'smoke test', a test where nothing, in particular, is being tested and we make sure that something is not noticeable broken (eg. if there are not smoke odds are it is not burning 🔥)

Author: Jaga Santagostino