Unit Testing: Fakes, Mocks and Stubs
When you perform unit testing, there are many situations where you don’t have the full code or the right context that is needed to execute it. It might be that part of the code is not written yet or that you interact with an external system that is difficult to access or you don’t want to impact with unit tests. In these cases, you need to create a test double, an object that behaves like its production equivalent. In this article, Michał Lipski describes three types of test doubles – fake, stub and mock – and gives you examples when to use them in your unit testing.
