-r requirements.txt

tox>=3.15.1,<4
flake8>=3.8.1,<3.9
pytest>=4.6.10,<5 ; python_version < '3'
pytest>=5.4.2,<6 ; python_version >= '3'
coverage>=5.1,<6
pytest-expect>=1.1.0,<2
mock>=3.0.5,<4 ; python_version < '3.6'
mock>=4.0.2,<5 ; python_version >= '3.6'