The Jest command-line tools are all you need to run your unit tests. There are a number of ways that the tool can be used. First, you'll learn how to invoke the test runner from a create-react-app environment and how to use the interactive watch mode options. Then, you'll learn how to run Jest in a standalone environment without the help of create-react-app.
When you create your React application using create-react-app, you're ready to run tests right away. In fact, as part of the boilerplate code that's created for you, a unit test for the App component is created. This test is added so that Jest will find a test that it can run. It doesn't actually test anything meaningful in your application, so you'll probably delete it once more tests are added.
Additionally, create-react-app adds the appropriate script to your package.json file to run your tests. You can just run the following command in your Terminal:
npm testThis will actually invoke the...
