coverage.py does not cover script if py.test executes it from another directory

Question

I got a python script which takes command line arguments, working with some files. I\'m writing succeeding tests with py.test putting this script through its pa

Answer 1

I encountered the same issue when calling "py.test --cov ..." from tox. I found a hint on this page: http://blog.ionelmc.ro/2014/05/25/python-packaging/ even though it does not mention this explicitly. Using "--develop" for tox will make sure that coverage data gathering is called from the same directory as coverage analysis. This section in tox.ini made it work for me to have a test environment for coverage:

[tox]
envlist = ...,py34,cov

[testenv:cov]
# necessary to make cov find the .coverage file
# see http://blog.ionelmc.ro/2014/05/25/python-packaging/
usedevelop = true
commands = py.test --cov=
deps = pytest pytest-cov