What are the best practices for testing an Express application?

What are the best practices for testing an Express application?

Some best practices include using automated testing frameworks like Mocha or Jest, writing unit tests for individual components, and integration tests for routes.

How do I set up Jest for my Express app?

To set up Jest, install it via npm, create a configuration file, and write your test cases in a __tests__ directory.

What should I test in my Express routes?

You should test the response status, response body, and any middleware functions that are used in the routes.

Can you give an example of a unit test for a middleware?

Sure! You can use Jest to create a test that checks if the middleware correctly modifies the request object or handles errors.