Should mocks be configured in config files

[Glutexo]

The Mock configuration like :onigumo, :http_client and :onigumo, :downloader are fixed for the environment. Should this compile-time configuration be in the same configuration file along with runtime-configurable values like :onigumo, :input_path, :onigumo, :downloaded_suffix? Put a comment there, put them in different files?

Homework: does mix test compile the app? Does it overwrite the existing compiled binaries? How does it set the environment to “test”?