test_ok1/py/doc/test-config.txt

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Test configuration
========================
test options and values
-----------------------------
You can see all available command line options by running::
py.test -h
py.test will lookup values of options in this order:
* option value supplied at command line
* content of environment variable ``PYTEST_OPTION_NAME=...``
* ``name = ...`` setting in the nearest ``conftest.py`` file.
The name of an option usually is the one you find
in the longform of the option, i.e. the name
behind the ``--`` double-dash.
IOW, you can set default values for options per project, per
home-directoray, per shell session or per test-run.