Gentoo's Bugzilla –
Attachment 512578 Details for
Bug 642976dev-python/geventhttpclient-1.3.1 : [TEST] _pytest.vendored_packages.pluggy.PluginValidationError: Plugin case could not be loaded: (mock 1.3.0 (/usr/lib64/python2.7/site-packages), Requirement.parse( mock>=2.0 ))!