pytest-cov collects no data on Travis

I recently switched from nosetests to pytest and pytest-cov for one of my Python project (

Locally, everything seemed to work fine and once on Travis, all tests passed as expected.

Yet, before the coverage report, I noticed this warning: warning: No data was collected"

and more importantly, the final coverage reported was 0% !!

I later realised that one file in the test/ directory was present locally but not in the github source code. After a commit, travis found the missing file and the coverage came back to normal.

So, this seems important for pytest-cov

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