auth: prevent misuse of PermFunction in bool context Evaluating a PermFunction as a boolean, rather than calling it, is almost certainly an error. If not, "pf is not None" can be used.

[tox]
minversion = 1.8
envlist = py{26,27}-pytest

[testenv]
setenv =
    PYTHONHASHSEED = 0
deps =
    pytest: pytest
commands =
    pytest: py.test {posargs}