Further learning

Check out the following resources for more information on the topics covered in this chapter:

• A good introduction to the different kinds of test doubles: https://martinfowler.com/articles/mocksArentStubs.html
• Jest mock functions: https://jestjs.io/docs/en/mock-functions.html
• An introduction to using the Fetch API: https://github.github.io/fetch