Testing the interface

We have a few things to test in this DSL:

• Integration: Testing whether the DSL plays well with the NotePlayer module to ensure the whole project is functional
• Sequences: Testing whether sequences are defined in the correct order and the defaults for note are working
• Restrictions: Testing whether the DSL works as expected and note and embed_notes can only be called inside sequence

Writing integration tests

Let’s start by adding the integration test:

test/mix_music/integration_test.exs

defmodule MixMusic.DoReMi do
  use MixMusic.DSL
  sequence :do_re_mi do
    note(:c, octet: 4, volume: 50, duration: 0.25)
    note(:d, modifier: :base, duration: 0.25)
    note(:e, modifier: :base, duration: 0.25)
  end
  sequence :fa_so_la_ti_do do
    note(:f, octet: 4, volume: 50, duration: 0.25)
    ...