test: bump pytest minimum version Recent test case changes broke compatibility with pytest < 3.0. FYI, the ~= version spec is a shorthand (PEP 440) used here to select "3.0 or any later 3.* release". We could probably use this more often.

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

[testenv]
setenv =
    PYTHONHASHSEED = 0
deps =
    -r{toxinidir}/dev_requirements.txt
    py26-pytest: unittest2
    python-ldap
    python-pam
commands =
    pytest: py.test {posargs}