Programming Phoenix 1.4

Testing the Information System

To warm up, we’re going to start our tests with our independent caching layer. Since our cache is made up of a standalone genserver, we can test it in isolation. It’s a good place to start because our cache can do two things: fetch and put.

Testing Our Cache

For the most part, testing our cache will work like testing any other service. We’ll create a cache and try some fetches and puts. Then we’ll use asserts to check what actually happened against our expectations. Let’s begin with a few basic tests and then we can handle corner cases for timeouts and shutdown. Shift into the apps/info_sys directory and then make tests/cache_test.exs look like this:

testing_otp/listings/rumbl_umbrella/apps/info_sys/test/cache_test.exs ...