Do install top-level "tests" package
Do install top-level "tests" package

8dd5882282abcbe67f7c7613f6381281276057ae has moved tests from inside
the package to top-level.  As a result, `find_packages()` now finds
and installs them as a top-level package.  Pass explicit `exclude=`
to avoid that.

harlowja/fasteners