-virtualenv --quiet -p "$PYTHON_VERSION" "/tmp/v/tox"
-# shellcheck source=/tmp/v/tox/bin/activate disable=SC1091
-source "/tmp/v/tox/bin/activate"
-pip install --quiet --upgrade "pip==9.0.3" setuptools
-pip install --quiet --upgrade pipdeptree
-pip install --quiet --upgrade argparse detox "tox<3.0.0" tox-pyenv