Learning Redux

Testing automatically on every file change

We can add another script, test:watch, which will run the tests every time we change and save a file.

Edit package.json and add a new test:watch script:

"scripts": {  ...other scripts...,  "test:watch": "npm test -- --watch"}

Now, we can execute the following command:

npm run test:watch

This will run all tests and re-run them every time we save a file:

Output of the Jest test engine in the --watch mode