My standard tox.ini file that allows you to run coverage, lettuce, nosetests and lint, and to pick out a given feature or a module for nosetest (So that you don't have to run the whole suite)

tox.ini

[tox]
envlist=py27,lint

[testenv]
downloadcache={homedir}/.pipcache
distribute=True
sitepackages=False

[testenv:py27]
deps=nose
        lettuce
        coverage
        mock
commands=
        coverage erase
        bash -c "test \"$(expr \"{posargs}\" : \".*\.feature\")\" -eq 0 && {envbindir}/coverage run {envbindir}/nosetests -w ./test/unit/ {posargs} || ( echo \"[TOX] Skipping nosetests\" && test \"$(expr \"{posargs}\" : \".*\.feature\")\" -ne 0 ) "
        bash -c "test -z \"{posargs}\" -o `expr \"{posargs}\" : \".*\.feature\"` -ne 0 && {envbindir}/coverage run {envbindir}/lettuce ./test/features/{posargs} || ( echo \"[TOX] Skipping lettuce\" && test \"$(expr \"{posargs}\" : \".*\.feature\")\" -eq 0 ) "
        coverage combine
        coverage report --include=* -m

[testenv:lint]
basepython=python2.7
deps=pylint
commands=pylint juicer2 --rcfile=pylint.rc

[testenv:docs]
basepython=python
changedir=doc
deps=sphinx
commands=sphinx-build -b html ./source ./html