Add test files to the repo?

[MattX]

Hello! Thanks for the work on this library.

I can't run the tests locally because they rely on a bunch of plugin files which are not in the repo. Have you considered adding them here (it looks like most / all of them are not actual game files, so they should be fine to include)? Or providing the files in another place where they can be downloaded, so it's possible to test the library locally?

[Ortham]

The testing plugins are already available here, and I don't want to add them to this repository because they're used by a few different repositories.