Exclude test package

[BastianZim]

Pull Request Checklist:

• [x] This PR addresses an already opened issue (for bug fixes / features)

  • This PR fixes issue #xyz

• [ ] Tests for the changes have been added (for bug fixes / features)

• [ ] Documentation has been added / updated (for bug fixes / features)

• [ ] HISTORY.rst has been updated (with summary of main changes)

• [ ] I have added my relevant user information to AUTHORS.md

• What kind of change does this PR introduce?:

• Does this PR introduce a breaking change?:

• Other information:

[agstephens]

Thanks @BastianZim