how to make py.test --cov skip virtualenv directory

Question

Should I care how my tests cover the external libraries I'm using in my project ?

The py.test --cov displays how all files are covered, including ones in my virtualenv directory. How can I make the output show only the coverage of the modules I've written ?

Answer 1

In the root of your project, create file .coveragerc containing:

[run] omit = path_to_libs_to_omit/* 

Depending on your setup, you might need to add --cov-config=path/to/.coveragerc as option to the py.test command.

There are more options you can use to configure coverage.

Answer 2

You should add your module's name to the --cov command line option, for example form pytest-cov documentation:

py.test --cov=myproj tests/ 

This restrict the coverage to the module myproj and all its sub-modules.