Mocking and stubbing suspend functions with MockK

MockK over the years became my go-to library for mocking suspend functions. Its intuitive syntax and built-in coroutine support simplify testing asynchronous operations. With MockK, you can easily replicate complex behaviors of coroutine-based functions, ensuring tests are reflective of real-world scenarios.

Mock – fake version of an object used in testing to check how other parts of a program interact with it.

Stub – fake part of the program that always returns the same result.

This article will show you how to use both in testing Kotlin code with MockK.