I get AttributeError: 'FlakesItem' object has no attribute '_collectfile' when running devpi-server tests with tox (tox -e py27 is enough) since pytest 3.7.0. When I pin to pytest<3.7dev it works (using 3.6.4).

It seems to be related to the current working directory. The tox config switches to test_devpi_server. When I run pytest in server it's fine, when i run in server/test_devpi_server it breaks.