When one needs different modules to be compiled in different environments, it’d be better to explicitly define these module sets, instead of polluting the source code with conditionals.
For the modules to be available in :test only, the common approach is to create test/support folder, and modify your mix.exs in the following way:
- Create a private function like this:
defp elixirc_paths(:test), do: ["lib", "test/support"]
defp elixirc_paths(_), do: ["lib"]
- Modify your
Mix.Project.project/0callback to include the following key/value pair:
elixirc_paths: elixirc_paths(Mix.env())
- Put all the files containing modules needed only in
testenvironment there.
That way all of them will be compiled in test and discarded in all other environments.
If you need some modules to exist in :prod only, declare compile paths appropriately.
