Running Tests Automatically and Code Coverage

Running Jest tests automatically

Jumping to the console every time you want to run some tests is a chore. Happily, Jest has a “watch mode” where it automatically re-runs all tests when it detects any change to a test file or a source file dependent on a test.

To start Jest in watch mode, run it with the --watchAll flag:

$ npx jest --watchAll

Now you should see ...