Integration Tests

One of our basic principles for testing is isolation, but that doesn’t mean that the most extreme isolation is always the right answer. The interactions among parts of your software are the very things that make it interesting. When you test your Phoenix applications, getting the right level of isolation is critical. Sometimes, a function is the perfect level of isolation. Sometimes, though, you’ll want to run a test that encompasses multiple layers of your application. This is the realm of the integration test.

Fortunately, we have a natural architectural barrier that enforces the perfect balance. We’re going to fully test the route through the endpoint, as a real web request will do. That way, we’ll execute each plug and ...

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