Chapter 3Testing OTP

In the previous two chapters, we established a mental framework to think and work with different levels of testing. We now have the tools to test isolated pieces of code through unit testing, test parts of the system that interact together through integration testing, and test the whole system through end-to-end testing. We covered many patterns that are specific to Elixir but also talked about testing practices in general. In this chapter, we’re going to focus on something that’s specific to Elixir: the OTP set of abstractions. We’re going to dive deeper into testing a few OTP abstractions, such as GenServers and supervisors, as well as talk about some patterns and things to pay attention to when testing asynchronous code. ...

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