Where to store test resources for EUnit?

Question

Erlang

Unit tests of my Erlang application require some resource files (certificate files, text and binary data,...). These files are only needed for testing, never for the application itself.
Now I store them in the priv directory of the project and manually remove them from the release.
Specify the directory structure so that the test data for eunit is not added to the release, but is available for testing.