Rename TestMessage to ExampleMessage When py.test is searching for tests it detects TestMessage as a potential class with test cases because it has 'Test' in its name. Because TestMessage contains a __init__ constructor py.test returns a warning that it can't collect tests from it. Lets rename the class to ExampleMessage to avoid this issue.

from roundup.dist.command.build import build_message_files, check_manifest
from distutils.command.install_lib import install_lib as base

class install_lib(base):

    def run(self):
        check_manifest()
        build_message_files(self)
        base.run(self)