Measure Unit Test coverage of specific files with Py.Test

Question

I'm trying to retrieve the coverage of my unittests with Py.Test. The problem is that I get also coverage information about other python files which I don't care about.

Here is an example of my file structure. In this case I want to test: car.py, wheel.py and steer.py

python2.7/site-packages/

• car.py
• wheel.py
• steer.py
• coverage.py (from pypi.python.org)
• yaml (the python yaml library, from pypi.python.org)
• pytest-2.5.2-py2.7.egg (the python py.test library)
• and many more

python2.7/site-packages/test/

• test_car.py
• conftest.py

Now I use Py.Test to execute the test:

python -m pytest --cov python2.7/site-packages/ python2.7/site-packages/test/test_car.py

But this results in the coverage of all the python files in site-packages (kinda obvious).

python -m pytest --cov python2.7/site-packages/car.py python2.7/site-packages/test/test_car.py

This results in only the coverage of the car.py and not all the files I want.

How can I use Py.Test to only to measure coverage of specific files?

(I also tried:

python -m pytest --cov python2.7/site-packages/car.py,python2.7/site-packages/wheel.py python2.7/site-packages/test/test_car.py

But Py.Test doesn't know how to parse and use this argument. )

Answer 1

I found the solution. You can supply multiple --cov file arguments.

python -m pytest \
  --cov python2.7/site-packages/car.py \
  --cov python2.7/site-packages/wheel.py \
  --cov python2.7/site-packages/steer.py \
  python2.7/site-packages/test/test_car.py