Cover page by Christian Johansen

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Chapter 16. Mocking and Stubbing

While using test-driven development to develop five sample projects, we’ve become intimately familiar with the stubFn function. We have used it as a tool to both inspect interaction between objects, as well as isolating interfaces under test. But what exactly is a stub? We are about to find out as we dive a little deeper into the topic of using test doubles, objects that look like the real thing but really are bleak impersonations used to simplify tests.

In this chapter we will look at the general theory of using test doubles, and get to know a few common types of test doubles a little better. Because we have already used stubs extensively in tests throughout Part III, Real-World Test-Driven Development in JavaScript ...

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