Above @mysterious-action-44812 had questions about testing out pants in other repos. Here is the 3-part recipe:

PANTS_PYTHONPATH="['/home/jsirois/dev/pantsbuild/jsirois-pants/contrib/python/src/python']" \
PANTS_PLUGINS="[]" \
PANTS_BACKEND_PACKAGES="['pants.contrib.python.checks']" \
/home/jsirois/dev/pantsbuild/jsirois-pants/pants -ldebug --print-exception-stacktrace test src/main/python:: src/test/python:: -- -v

This is me working https://github.com/pantsbuild/pants/issues/3188 in the aurora repo using pants from the pants repo