Tests Call the API as a User Would

Designing Elixir Systems with OTP — Pragmatic Programmers (77 / 81)

👈 Chapter 10 Test the Boundary | TOC | Isolate the Proctor’s Boundary Concerns 👉

Our test will deal with the entire Mastery API. This whole book has been building up to this point. This test will not exercise our code as an interior function might, rather, it will test the whole API as an end user of the dependency. If we’ve done our job well, we’ll be able to express the entire test in a few short pages of code.

Our plan is to cover tests for the overarching API, and then move on to more specific tests within the poncho project. In this chapter, we won’t provide an exhaustive test to cover every corner condition. Instead, we’ll give you the strategies you might use to meet the testing strategies you’re likely to face to build effective boundary tests. Let’s write the first test.

We start with the module definition, the use directive for the ExUnit test case for running tests, and the use directive for our helper fixtures. We establish these tests as async: false because they should not run concurrently. We have a single QuizManager GenServer that’s bound to the module so running a concurrent version of this test would interfere with our test. Luckily, this file will be pretty thin so we won’t pay too much of a penalty.

We follow our use directives up with more than a few aliases for all of the services we plan to use. It’s an integration test, after all. Now, we can turn our attention to persistence:

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