Designing Elixir Systems With OTP

Try Out the Core

IEx is a great tool to sanity check our code as we go. We’re not going to run an exhaustive test; we’ll save that work for the test chapter (Chapter 5, ​ Test Your Core ​). We’ll use IEx to do a quick integration check to make sure our tools work together as we expect.

To do any meaningful integration test, we need a quiz but before we can build one we’ll need a template. Our quiz will use a single template for addition that generates questions of the form “x + y”. Type iex -S mix to open the codebase interactively:

$ iex -S mix
iex(1)> alias Mastery.Core.{Template, Quiz, Response}
[Mastery.Core.Template, Mastery.Core.Quiz, Mastery.Core.Response]
iex(2)> generator = %{ left: [1, 2], right: [1, 2] }
%{left: [1, 2], ...