Full-Stack React Projects - Second Edition

Installing the packages

In order to set up Jest and integrate the test code with our projects, we first need to install the relevant Node packages. The following packages will be required in order to write the test code and run the tests:

• jest: To include the Jest testing framework
• babel-jest: To compile JS code for Jest
• react-test-renderer: To create a snapshot of the DOM tree rendered by a React DOM without using a browser

To install these packages as devDependencies, run the following yarn command from the command line:

yarn add --dev jest babel-jest react-test-renderer

Once these packages are installed, we can start adding tests after configuring the test runner script, as discussed in the next section.