Video: Mocking Asynchronous Functions with Jest

Mocking is a fundamental skill in testing. It allows you to avoid testing parts of your code that are outside your control, or to get reliable return values from said code.

00:00 - What we'll cover

01:00 - Reviewing the project setup

03:02 - Creating the test

06:24 - Adding async await to pass test

07:17 - Why mock an api request for unit tests

08:32 - Adding jest mock for axios

14:06 - Check if mock function has been called

15:31 - Shorthand for mocking resolved promise value

16:23 - Gotcha for mock state, and how to clear it each test

18:24 - Alternate way of mocking within a test file

20:50 - Wrap-up

Repository for code example:

https://github.com/Jimmydalecleveland/jest-mock-async-example

Blog Post:

https://blog.jimmydc.com/mock-asynchronous-functions-with-jest/

Swapi Dev:

https://swapi.dev/

Follow Jimmy Cleveland's doings:

twitter: https://twitter.com/JimmyDCleveland

blog: https://blog.jimmydc.com/

#jest #mock #async