This repository uses a contrived example to showcase a simple refactoring of some test helpers to eventually leverage ActiveSupport::Concern. The objective is to show how and why one might want to use Concerns instead of regular module inclusion or extension.
This scenario illustrates the usage of Concerns, not how to write good code or tests. For example, this code would probably be better tested by treating ToasterTest as a unit test and stubbing out Breadis entirely. Moreover, Breadis would be vulnerable to race conditions in any kind of concurrent environment. Not to mention the toasters prepare orders in random order, instead of using some sort of queueing system!