requirements.txt

# Build requirements
-e git+https://github.com/juju/charm-tools.git#egg=charm-tools
simplejson

tox.ini

[tox]
skipsdist = True
envlist = venv

[testenv]
setenv = VIRTUAL_ENV={envdir}
         PYTHONHASHSEED=0
         TERM=linux

passenv = http_proxy https_proxy
install_command =
  pip install {opts} {packages}
deps =
    -r{toxinidir}/requirements.txt

[testenv:venv]
commands = {posargs}