six
pytest >= 3.0; python_version != '3.3'
pytest <  3.3; python_version == '3.3'
pytest-cov >= 2.0.0
freezegun < 0.3.11; python_version == '3.3'
freezegun ; python_version != '3.3'
hypothesis >= 3.30
coverage
mock ; python_version < '3.0'