Provided by: python3-pytest_7.4.4-1_all 
NAME
pytest - pytest usage
SEE ALSO:
Complete pytest command-line flag reference
In general, pytest is invoked with the command pytest (see below for other ways to invoke pytest). This
will execute all tests in all files whose names follow the form test_*.py or \*_test.py in the current
directory and its subdirectories. More generally, pytest follows standard test discovery rules.
SPECIFYING WHICH TESTS TO RUN
Pytest supports several ways to run and select tests from the command-line.
Run tests in a module
pytest test_mod.py
Run tests in a directory
pytest testing/
Run tests by keyword expressions
pytest -k 'MyClass and not method'
This will run tests which contain names that match the given string expression (case-insensitive), which
can include Python operators that use filenames, class names and function names as variables. The
example above will run TestMyClass.test_something but not TestMyClass.test_method_simple. Use ""
instead of '' in expression when running this on Windows
Run tests by node ids
Each collected test is assigned a unique nodeid which consist of the module filename followed by
specifiers like class names, function names and parameters from parametrization, separated by ::
characters.
To run a specific test within a module:
pytest test_mod.py::test_func
Another example specifying a test method in the command line:
pytest test_mod.py::TestClass::test_method
Run tests by marker expressions
pytest -m slow
Will run all tests which are decorated with the @pytest.mark.slow decorator.
For more information see marks.
Run tests from packages
pytest --pyargs pkg.testing
This will import pkg.testing and use its filesystem location to find and run tests from.
GETTING HELP ON VERSION, OPTION NAMES, ENVIRONMENT VARIABLES
pytest --version # shows where pytest was imported from
pytest --fixtures # show available builtin function arguments
pytest -h | --help # show help on command line and config file options
PROFILING TEST EXECUTION DURATION
Changed in version 6.0.
To get a list of the slowest 10 test durations over 1.0s long:
pytest --durations=10 --durations-min=1.0
By default, pytest will not show test durations that are too small (<0.005s) unless -vv is passed on the
command-line.
MANAGING LOADING OF PLUGINS
Early loading plugins
You can early-load plugins (internal and external) explicitly in the command-line with the -p option:
pytest -p mypluginmodule
The option receives a name parameter, which can be:
• A full module dotted name, for example myproject.plugins. This dotted name must be importable.
• The entry-point name of a plugin. This is the name passed to setuptools when the plugin is registered.
For example to early-load the pytest-cov plugin you can use:
pytest -p pytest_cov
Disabling plugins
To disable loading specific plugins at invocation time, use the -p option together with the prefix no:.
Example: to disable loading the plugin doctest, which is responsible for executing doctest tests from
text files, invoke pytest like this:
pytest -p no:doctest
OTHER WAYS OF CALLING PYTEST
Calling pytest through python -m pytest
You can invoke testing through the Python interpreter from the command line:
python -m pytest [...]
This is almost equivalent to invoking the command line script pytest [...] directly, except that calling
via python will also add the current directory to sys.path.
Calling pytest from Python code
You can invoke pytest from Python code directly:
retcode = pytest.main()
this acts as if you would call "pytest" from the command line. It will not raise SystemExit but return
the exit code instead. If you don't pass it any arguments, main reads the arguments from the command
line arguments of the process (sys.argv), which may be undesirable. You can pass in options and
arguments explicitly:
retcode = pytest.main(["-x", "mytestdir"])
You can specify additional plugins to pytest.main:
# content of myinvoke.py
import sys
import pytest
class MyPlugin:
def pytest_sessionfinish(self):
print("*** test run reporting finishing")
if __name__ == "__main__":
sys.exit(pytest.main(["-qq"], plugins=[MyPlugin()]))
Running it will show that MyPlugin was added and its hook was invoked:
$ python myinvoke.py
*** test run reporting finishing
NOTE:
Calling pytest.main() will result in importing your tests and any modules that they import. Due to the
caching mechanism of python's import system, making subsequent calls to pytest.main() from the same
process will not reflect changes to those files between the calls. For this reason, making multiple
calls to pytest.main() from the same process (in order to re-run tests, for example) is not
recommended.
AUTHOR
holger krekel at merlinux eu
COPYRIGHT
2024, holger krekel and pytest-dev team