combine python coverage files?

If your source code is in a directory called my_project, you can also do this if you have included pytest and pytest-cov in your virtual environment:

pytest --cov-report html --cov=my_project unit_tests
pytest --cov-report html --cov=my_project --cov-append functional_tests

The --cov-append will add the functional test coverage info to the coverage file that was created when you ran the unit tests.

I found a different solution. I used combine feature (read here) So I run my coverage like: coverage run -p and then I do coverage combine.

That's all. It generates 1 combined report.

You can't combine .xml files, but you can combine the raw data files. Your workflow would look like this:

$ COVERAGE_FILE=.coverage_func coverage run the_functional_tests.py
$ COVERAGE_FILE=.coverage_inte coverage run the_integration_tests.py
$ coverage combine
$ coverage xml

You can achieve same result by using appending option. Suppose you ran the coverage on three python scripts.After first coverage use -a for appending.

coverage run first.py
coverage run -a second.py
coverage run -a third.py

Print the report

coverage report -m

Output:Report

Name             Stmts   Miss  Cover   Missing
----------------------------------------------
first.py           97      1    99%   95
second.py            1      0   100%
third.py            10      0   100%
----------------------------------------------
TOTAL               108      1    99%