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Using coverage with pytests is a very useful tool.

Html reporting allows for nice output, however through command line, can't find an option to modify the default output directory (htmlcov)

example command line:

python -m pytest lib_being_tested\tests --cov lib_being_tested.module --cov-report=html
now (3 years later) you can change the default output directory directly in command line:
python -m pytest --cov --cov-report=html:reports/html_dir --cov-report=xml:reports/coverage.xml lib_being_tested.module
Missing directories are created on the fly
Simeon's answer is still relevant to choose this output directory through coverage configuration file
This configuration option isn't part of pytest-cov.
In the configuration file for the underlying tool coverage.py, which is called .coveragerc by default, you can add:
[html]
directory = differentname
See the documentation for details: https://github.com/nedbat/coveragepy/blob/master/doc/config.rst
                The docs are also available at their canonical location: nedbatchelder.com/code/coverage/config.html
– Ned Batchelder
                Dec 18, 2014 at 19:33
        
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