pytest_nlcov

With pytest_nlcov you can check the test coverage of new lines only. It will check git for added and modified lines and will compute the coverage just for those lines

Installation

pip install pytest_nlcov

Note: pytest_cov is required and will be automatically installed when it is not installed yet.

Usage with pytest

When pytest_nlcov is installed, it will be discovered by pytest and executed as last step to show you the test coverage of new lines.

pytest

Three options can be given:

• revision
• fail threshold
• root_dir

Revision

Default, the new lines are based on the git diff with master. You can specify other revisions.

pytest --cov=myproj --nlcov-revision=main

Fail Threshold

Optionally you can add a threshold to fail the tests when the coverage is below the threshold.

pytest --cov=myproj --nlcov-fail-under=0.6

Root Dir

Optionally you can set the root dir of the git repo, so the command can be run from another directory that is not the root of the repo.

pytest --cov=myproj --nlcov-root-dir=repo_dir

Note

It's important to include --cov to load the pytest_cov plugin; otherwise an error message will appear saying:

nlcov is installed, but pytest-cov is not installed, so nlcov will not be executed.

Usage without pytest

pytest_nlcov can be run without pytest. Therefor you have to run coverage first, because pytest_nlcov needs its coverage data.

coverage
nlcov

Optionally a revision can be given

nlcov main