Programming Phoenix 1.4

Integration Tests

We’ve begun by testing our contexts. Since our contexts deal with database-backed applications, those tests checked the way we created, deleted, fetched, and updated data from the database. We also paid special attention to how we processed changes and errors. Our context API exposed those features through changesets.

Now it’s time to shift to 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. ...