mock
pytest-flake8; python_version!="3.4"
pytest-flake8<=1.0.0; python_version=="3.4"
virtualenv>=13.0.0
pytest-virtualenv>=1.2.7
# pytest pinned to <4 due to #1638
pytest>=3.7,<4
wheel
coverage>=4.5.1
pytest-cov>=2.5.1
paver; python_version>="3.6"
futures; python_version=="2.7"
pip==18.1  # Temporary workaround for #1644.