niceSOFT/python3-pytest: The pytest framework makes it easy to write small tests, yet scales to support complex functional testing

doc/en/reference/reference.rst
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Reintroduce PytestReturnNotNoneWarning (#13495) (#13527)
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:tocdepth: 3

.. _`api-reference`:

API Reference
=============

This page contains the full reference to pytest's API.


Constants
---------

pytest.__version__
~~~~~~~~~~~~~~~~~~

The current pytest version, as a string::

    >>> import pytest
    >>> pytest.__version__
    '7.0.0'

.. _`hidden-param`:

pytest.HIDDEN_PARAM
~~~~~~~~~~~~~~~~~~~

.. versionadded:: 8.4

Can be passed to ``ids`` of :py:func:`Metafunc.parametrize <pytest.Metafunc.parametrize>`
or to ``id`` of :func:`pytest.param` to hide a parameter set from the test name.
Can only be used at most 1 time, as test names need to be unique.

.. _`version-tuple`:

pytest.version_tuple
~~~~~~~~~~~~~~~~~~~~

.. versionadded:: 7.0

The current pytest version, as a tuple::

    >>> import pytest
    >>> pytest.version_tuple
    (7, 0, 0)

For pre-releases, the last component will be a string with the prerelease version::

    >>> import pytest
    >>> pytest.version_tuple
    (7, 0, '0rc1')


Functions
---------

pytest.approx
~~~~~~~~~~~~~

.. autofunction:: pytest.approx

pytest.fail
~~~~~~~~~~~

**Tutorial**: :ref:`skipping`

.. autofunction:: pytest.fail(reason, [pytrace=True])

.. class:: pytest.fail.Exception

    The exception raised by :func:`pytest.fail`.

pytest.skip
~~~~~~~~~~~

.. autofunction:: pytest.skip(reason, [allow_module_level=False])

.. class:: pytest.skip.Exception

    The exception raised by :func:`pytest.skip`.

.. _`pytest.importorskip ref`:

pytest.importorskip
~~~~~~~~~~~~~~~~~~~

.. autofunction:: pytest.importorskip

pytest.xfail
~~~~~~~~~~~~

.. autofunction:: pytest.xfail

.. class:: pytest.xfail.Exception

    The exception raised by :func:`pytest.xfail`.

pytest.exit
~~~~~~~~~~~

.. autofunction:: pytest.exit(reason, [returncode=None])

.. class:: pytest.exit.Exception

    The exception raised by :func:`pytest.exit`.

pytest.main
~~~~~~~~~~~

**Tutorial**: :ref:`pytest.main-usage`

.. autofunction:: pytest.main

pytest.param
~~~~~~~~~~~~

.. autofunction:: pytest.param(*values, [id], [marks])

pytest.raises
~~~~~~~~~~~~~

**Tutorial**: :ref:`assertraises`

.. autofunction:: pytest.raises(expected_exception: Exception [, *, match])
    :with: excinfo

pytest.deprecated_call
~~~~~~~~~~~~~~~~~~~~~~

**Tutorial**: :ref:`ensuring_function_triggers`

.. autofunction:: pytest.deprecated_call([match])
    :with:

pytest.register_assert_rewrite
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

**Tutorial**: :ref:`assertion-rewriting`

.. autofunction:: pytest.register_assert_rewrite

pytest.warns
~~~~~~~~~~~~

**Tutorial**: :ref:`assertwarnings`

.. autofunction:: pytest.warns(expected_warning: Exception, [match])
    :with:

pytest.freeze_includes
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

**Tutorial**: :ref:`freezing-pytest`

.. autofunction:: pytest.freeze_includes

.. _`marks ref`:

Marks
-----

Marks can be used to apply metadata to *test functions* (but not fixtures), which can then be accessed by
fixtures or plugins.




.. _`pytest.mark.filterwarnings ref`:

pytest.mark.filterwarnings
~~~~~~~~~~~~~~~~~~~~~~~~~~

**Tutorial**: :ref:`filterwarnings`

Add warning filters to marked test items.

.. py:function:: pytest.mark.filterwarnings(filter)

    :keyword str filter:
        A *warning specification string*, which is composed of contents of the tuple ``(action, message, category, module, lineno)``
        as specified in :ref:`python:warning-filter` section of
        the Python documentation, separated by ``":"``. Optional fields can be omitted.
        Module names passed for filtering are not regex-escaped.

        For example:

        .. code-block:: python

            @pytest.mark.filterwarnings("ignore:.*usage will be deprecated.*:DeprecationWarning")
            def test_foo(): ...


.. _`pytest.mark.parametrize ref`:

pytest.mark.parametrize
~~~~~~~~~~~~~~~~~~~~~~~

**Tutorial**: :ref:`parametrize`

This mark has the same signature as :py:meth:`pytest.Metafunc.parametrize`; see there.


.. _`pytest.mark.skip ref`:

pytest.mark.skip
~~~~~~~~~~~~~~~~

**Tutorial**: :ref:`skip`

Unconditionally skip a test function.

.. py:function:: pytest.mark.skip(reason=None)

    :keyword str reason: Reason why the test function is being skipped.


.. _`pytest.mark.skipif ref`:

pytest.mark.skipif
~~~~~~~~~~~~~~~~~~

**Tutorial**: :ref:`skipif`

Skip a test function if a condition is ``True``.

.. py:function:: pytest.mark.skipif(condition, *, reason=None)

    :type condition: bool or str
    :param condition: ``True/False`` if the condition should be skipped or a :ref:`condition string <string conditions>`.
    :keyword str reason: Reason why the test function is being skipped.


.. _`pytest.mark.usefixtures ref`:

pytest.mark.usefixtures
~~~~~~~~~~~~~~~~~~~~~~~

**Tutorial**: :ref:`usefixtures`

Mark a test function as using the given fixture names.

.. py:function:: pytest.mark.usefixtures(*names)

    :param args: The names of the fixture to use, as strings.

.. note::

    When using `usefixtures` in hooks, it can only load fixtures when applied to a test function before test setup
    (for example in the `pytest_collection_modifyitems` hook).

    Also note that this mark has no effect when applied to **fixtures**.



.. _`pytest.mark.xfail ref`:

pytest.mark.xfail
~~~~~~~~~~~~~~~~~~

**Tutorial**: :ref:`xfail`

Marks a test function as *expected to fail*.

.. py:function:: pytest.mark.xfail(condition=False, *, reason=None, raises=None, run=True, strict=xfail_strict)

    :keyword Union[bool, str] condition:
        Condition for marking the test function as xfail (``True/False`` or a
        :ref:`condition string <string conditions>`). If a ``bool``, you also have
        to specify ``reason`` (see :ref:`condition string <string conditions>`).
    :keyword str reason:
        Reason why the test function is marked as xfail.
    :keyword raises:
        Exception class (or tuple of classes) expected to be raised by the test function; other exceptions will fail the test.
        Note that subclasses of the classes passed will also result in a match (similar to how the ``except`` statement works).
    :type raises: Type[:py:exc:`Exception`]

    :keyword bool run:
        Whether the test function should actually be executed. If ``False``, the function will always xfail and will
        not be executed (useful if a function is segfaulting).
    :keyword bool strict:
        * If ``False`` the function will be shown in the terminal output as ``xfailed`` if it fails
          and as ``xpass`` if it passes. In both cases this will not cause the test suite to fail as a whole. This
          is particularly useful to mark *flaky* tests (tests that fail at random) to be tackled later.
        * If ``True``, the function will be shown in the terminal output as ``xfailed`` if it fails, but if it
          unexpectedly passes then it will **fail** the test suite. This is particularly useful to mark functions
          that are always failing and there should be a clear indication if they unexpectedly start to pass (for example
          a new release of a library fixes a known bug).

        Defaults to :confval:`xfail_strict`, which is ``False`` by default.


Custom marks
~~~~~~~~~~~~

Marks are created dynamically using the factory object ``pytest.mark`` and applied as a decorator.

For example:

.. code-block:: python

    @pytest.mark.timeout(10, "slow", method="thread")
    def test_function(): ...

Will create and attach a :class:`Mark <pytest.Mark>` object to the collected
:class:`Item <pytest.Item>`, which can then be accessed by fixtures or hooks with
:meth:`Node.iter_markers <_pytest.nodes.Node.iter_markers>`. The ``mark`` object will have the following attributes:

.. code-block:: python

    mark.args == (10, "slow")
    mark.kwargs == {"method": "thread"}

Example for using multiple custom markers:

.. code-block:: python

    @pytest.mark.timeout(10, "slow", method="thread")
    @pytest.mark.slow
    def test_function(): ...

When :meth:`Node.iter_markers <_pytest.nodes.Node.iter_markers>` or :meth:`Node.iter_markers_with_node <_pytest.nodes.Node.iter_markers_with_node>` is used with multiple markers, the marker closest to the function will be iterated over first. The above example will result in ``@pytest.mark.slow`` followed by ``@pytest.mark.timeout(...)``.

.. _`fixtures-api`:

Fixtures
--------

**Tutorial**: :ref:`fixture`

Fixtures are requested by test functions or other fixtures by declaring them as argument names.


Example of a test requiring a fixture:

.. code-block:: python

    def test_output(capsys):
        print("hello")
        out, err = capsys.readouterr()
        assert out == "hello\n"


Example of a fixture requiring another fixture:

.. code-block:: python

    @pytest.fixture
    def db_session(tmp_path):
        fn = tmp_path / "db.file"
        return connect(fn)

For more details, consult the full :ref:`fixtures docs <fixture>`.


.. _`pytest.fixture-api`:

@pytest.fixture
~~~~~~~~~~~~~~~

.. autofunction:: pytest.fixture
    :decorator:


.. fixture:: capfd

capfd
~~~~~~

**Tutorial**: :ref:`captures`

.. autofunction:: _pytest.capture.capfd()
    :no-auto-options:


.. fixture:: capfdbinary

capfdbinary
~~~~~~~~~~~~

**Tutorial**: :ref:`captures`

.. autofunction:: _pytest.capture.capfdbinary()
    :no-auto-options:


.. fixture:: caplog

caplog
~~~~~~

**Tutorial**: :ref:`logging`

.. autofunction:: _pytest.logging.caplog()
    :no-auto-options:

    Returns a :class:`pytest.LogCaptureFixture` instance.

.. autoclass:: pytest.LogCaptureFixture()
    :members:


.. fixture:: capsys

capsys
~~~~~~

**Tutorial**: :ref:`captures`

.. autofunction:: _pytest.capture.capsys()
    :no-auto-options:

.. autoclass:: pytest.CaptureFixture()
    :members:

.. fixture:: capteesys

capteesys
~~~~~~~~~

**Tutorial**: :ref:`captures`

.. autofunction:: _pytest.capture.capteesys()
    :no-auto-options:

.. fixture:: capsysbinary

capsysbinary
~~~~~~~~~~~~

**Tutorial**: :ref:`captures`

.. autofunction:: _pytest.capture.capsysbinary()
    :no-auto-options:


.. fixture:: cache

config.cache
~~~~~~~~~~~~

**Tutorial**: :ref:`cache`

The ``config.cache`` object allows other plugins and fixtures
to store and retrieve values across test runs. To access it from fixtures
request ``pytestconfig`` into your fixture and get it with ``pytestconfig.cache``.

Under the hood, the cache plugin uses the simple
``dumps``/``loads`` API of the :py:mod:`json` stdlib module.

``config.cache`` is an instance of :class:`pytest.Cache`:

.. autoclass:: pytest.Cache()
   :members:


.. fixture:: doctest_namespace

doctest_namespace
~~~~~~~~~~~~~~~~~

**Tutorial**: :ref:`doctest`

.. autofunction:: _pytest.doctest.doctest_namespace()


.. fixture:: monkeypatch

monkeypatch
~~~~~~~~~~~

**Tutorial**: :ref:`monkeypatching`

.. autofunction:: _pytest.monkeypatch.monkeypatch()
    :no-auto-options:

    Returns a :class:`~pytest.MonkeyPatch` instance.

.. autoclass:: pytest.MonkeyPatch
    :members:


.. fixture:: pytestconfig

pytestconfig
~~~~~~~~~~~~

.. autofunction:: _pytest.fixtures.pytestconfig()


.. fixture:: pytester

pytester
~~~~~~~~

.. versionadded:: 6.2

Provides a :class:`~pytest.Pytester` instance that can be used to run and test pytest itself.

It provides an empty directory where pytest can be executed in isolation, and contains facilities
to write tests, configuration files, and match against expected output.

To use it, include in your topmost ``conftest.py`` file:

.. code-block:: python

    pytest_plugins = "pytester"



.. autoclass:: pytest.Pytester()
    :members:

.. autoclass:: pytest.RunResult()
    :members:

.. autoclass:: pytest.LineMatcher()
    :members:
    :special-members: __str__

.. autoclass:: pytest.HookRecorder()
    :members:

.. autoclass:: pytest.RecordedHookCall()
    :members:


.. fixture:: record_property

record_property
~~~~~~~~~~~~~~~~~~~

**Tutorial**: :ref:`record_property example`

.. autofunction:: _pytest.junitxml.record_property()


.. fixture:: record_testsuite_property

record_testsuite_property
~~~~~~~~~~~~~~~~~~~~~~~~~

**Tutorial**: :ref:`record_testsuite_property example`

.. autofunction:: _pytest.junitxml.record_testsuite_property()


.. fixture:: recwarn

recwarn
~~~~~~~

**Tutorial**: :ref:`recwarn`

.. autofunction:: _pytest.recwarn.recwarn()
    :no-auto-options:

.. autoclass:: pytest.WarningsRecorder()
    :members:
    :special-members: __getitem__, __iter__, __len__


.. fixture:: request

request
~~~~~~~

**Example**: :ref:`request example`

The ``request`` fixture is a special fixture providing information of the requesting test function.

.. autoclass:: pytest.FixtureRequest()
    :members:


.. fixture:: testdir

testdir
~~~~~~~

Identical to :fixture:`pytester`, but provides an instance whose methods return
legacy ``py.path.local`` objects instead when applicable.

New code should avoid using :fixture:`testdir` in favor of :fixture:`pytester`.

.. autoclass:: pytest.Testdir()
    :members:
    :noindex: TimeoutExpired


.. fixture:: tmp_path

tmp_path
~~~~~~~~

**Tutorial**: :ref:`tmp_path`

.. autofunction:: _pytest.tmpdir.tmp_path()
    :no-auto-options:


.. fixture:: tmp_path_factory

tmp_path_factory
~~~~~~~~~~~~~~~~

**Tutorial**: :ref:`tmp_path_factory example`

.. _`tmp_path_factory factory api`:

``tmp_path_factory`` is an instance of :class:`~pytest.TempPathFactory`:

.. autoclass:: pytest.TempPathFactory()
    :members:


.. fixture:: tmpdir

tmpdir
~~~~~~

**Tutorial**: :ref:`tmpdir and tmpdir_factory`

.. autofunction:: _pytest.legacypath.LegacyTmpdirPlugin.tmpdir()
    :no-auto-options:


.. fixture:: tmpdir_factory

tmpdir_factory
~~~~~~~~~~~~~~

**Tutorial**: :ref:`tmpdir and tmpdir_factory`

``tmpdir_factory`` is an instance of :class:`~pytest.TempdirFactory`:

.. autoclass:: pytest.TempdirFactory()
    :members:


.. _`hook-reference`:

Hooks
-----

**Tutorial**: :ref:`writing-plugins`

Reference to all hooks which can be implemented by :ref:`conftest.py files <localplugin>` and :ref:`plugins <plugins>`.

@pytest.hookimpl
~~~~~~~~~~~~~~~~

.. function:: pytest.hookimpl
    :decorator:

    pytest's decorator for marking functions as hook implementations.

    See :ref:`writinghooks` and :func:`pluggy.HookimplMarker`.

@pytest.hookspec
~~~~~~~~~~~~~~~~

.. function:: pytest.hookspec
    :decorator:

    pytest's decorator for marking functions as hook specifications.

    See :ref:`declaringhooks` and :func:`pluggy.HookspecMarker`.

.. currentmodule:: _pytest.hookspec

Bootstrapping hooks
~~~~~~~~~~~~~~~~~~~

Bootstrapping hooks called for plugins registered early enough (internal and third-party plugins).

.. hook:: pytest_load_initial_conftests
.. autofunction:: pytest_load_initial_conftests
.. hook:: pytest_cmdline_parse
.. autofunction:: pytest_cmdline_parse
.. hook:: pytest_cmdline_main
.. autofunction:: pytest_cmdline_main

.. _`initialization-hooks`:

Initialization hooks
~~~~~~~~~~~~~~~~~~~~

Initialization hooks called for plugins and ``conftest.py`` files.

.. hook:: pytest_addoption
.. autofunction:: pytest_addoption
.. hook:: pytest_addhooks
.. autofunction:: pytest_addhooks
.. hook:: pytest_configure
.. autofunction:: pytest_configure
.. hook:: pytest_unconfigure
.. autofunction:: pytest_unconfigure
.. hook:: pytest_sessionstart
.. autofunction:: pytest_sessionstart
.. hook:: pytest_sessionfinish
.. autofunction:: pytest_sessionfinish

.. hook:: pytest_plugin_registered
.. autofunction:: pytest_plugin_registered

Collection hooks
~~~~~~~~~~~~~~~~

``pytest`` calls the following hooks for collecting files and directories:

.. hook:: pytest_collection
.. autofunction:: pytest_collection
.. hook:: pytest_ignore_collect
.. autofunction:: pytest_ignore_collect
.. hook:: pytest_collect_directory
.. autofunction:: pytest_collect_directory
.. hook:: pytest_collect_file
.. autofunction:: pytest_collect_file
.. hook:: pytest_pycollect_makemodule
.. autofunction:: pytest_pycollect_makemodule

For influencing the collection of objects in Python modules
you can use the following hook:

.. hook:: pytest_pycollect_makeitem
.. autofunction:: pytest_pycollect_makeitem
.. hook:: pytest_generate_tests
.. autofunction:: pytest_generate_tests
.. hook:: pytest_make_parametrize_id
.. autofunction:: pytest_make_parametrize_id

Hooks for influencing test skipping:

.. hook:: pytest_markeval_namespace
.. autofunction:: pytest_markeval_namespace

After collection is complete, you can modify the order of
items, delete or otherwise amend the test items:

.. hook:: pytest_collection_modifyitems
.. autofunction:: pytest_collection_modifyitems

.. note::
    If this hook is implemented in ``conftest.py`` files, it always receives all collected items, not only those
    under the ``conftest.py`` where it is implemented.

.. autofunction:: pytest_collection_finish

Test running (runtest) hooks
~~~~~~~~~~~~~~~~~~~~~~~~~~~~

All runtest related hooks receive a :py:class:`pytest.Item <pytest.Item>` object.

.. hook:: pytest_runtestloop
.. autofunction:: pytest_runtestloop
.. hook:: pytest_runtest_protocol
.. autofunction:: pytest_runtest_protocol
.. hook:: pytest_runtest_logstart
.. autofunction:: pytest_runtest_logstart
.. hook:: pytest_runtest_logfinish
.. autofunction:: pytest_runtest_logfinish
.. hook:: pytest_runtest_setup
.. autofunction:: pytest_runtest_setup
.. hook:: pytest_runtest_call
.. autofunction:: pytest_runtest_call
.. hook:: pytest_runtest_teardown
.. autofunction:: pytest_runtest_teardown
.. hook:: pytest_runtest_makereport
.. autofunction:: pytest_runtest_makereport

For deeper understanding you may look at the default implementation of
these hooks in ``_pytest.runner`` and maybe also
in ``_pytest.pdb`` which interacts with ``_pytest.capture``
and its input/output capturing in order to immediately drop
into interactive debugging when a test failure occurs.

.. hook:: pytest_pyfunc_call
.. autofunction:: pytest_pyfunc_call

Reporting hooks
~~~~~~~~~~~~~~~

Session related reporting hooks:

.. hook:: pytest_collectstart
.. autofunction:: pytest_collectstart
.. hook:: pytest_make_collect_report
.. autofunction:: pytest_make_collect_report
.. hook:: pytest_itemcollected
.. autofunction:: pytest_itemcollected
.. hook:: pytest_collectreport
.. autofunction:: pytest_collectreport
.. hook:: pytest_deselected
.. autofunction:: pytest_deselected
.. hook:: pytest_report_header
.. autofunction:: pytest_report_header
.. hook:: pytest_report_collectionfinish
.. autofunction:: pytest_report_collectionfinish
.. hook:: pytest_report_teststatus
.. autofunction:: pytest_report_teststatus
.. hook:: pytest_report_to_serializable
.. autofunction:: pytest_report_to_serializable
.. hook:: pytest_report_from_serializable
.. autofunction:: pytest_report_from_serializable
.. hook:: pytest_terminal_summary
.. autofunction:: pytest_terminal_summary
.. hook:: pytest_fixture_setup
.. autofunction:: pytest_fixture_setup
.. hook:: pytest_fixture_post_finalizer
.. autofunction:: pytest_fixture_post_finalizer
.. hook:: pytest_warning_recorded
.. autofunction:: pytest_warning_recorded

Central hook for reporting about test execution:

.. hook:: pytest_runtest_logreport
.. autofunction:: pytest_runtest_logreport

Assertion related hooks:

.. hook:: pytest_assertrepr_compare
.. autofunction:: pytest_assertrepr_compare
.. hook:: pytest_assertion_pass
.. autofunction:: pytest_assertion_pass


Debugging/Interaction hooks
~~~~~~~~~~~~~~~~~~~~~~~~~~~

There are few hooks which can be used for special
reporting or interaction with exceptions:

.. hook:: pytest_internalerror
.. autofunction:: pytest_internalerror
.. hook:: pytest_keyboard_interrupt
.. autofunction:: pytest_keyboard_interrupt
.. hook:: pytest_exception_interact
.. autofunction:: pytest_exception_interact
.. hook:: pytest_enter_pdb
.. autofunction:: pytest_enter_pdb
.. hook:: pytest_leave_pdb
.. autofunction:: pytest_leave_pdb


Collection tree objects
-----------------------

These are the collector and item classes (collectively called "nodes") which
make up the collection tree.

Node
~~~~

.. autoclass:: _pytest.nodes.Node()
    :members:
    :show-inheritance:

Collector
~~~~~~~~~

.. autoclass:: pytest.Collector()
    :members:
    :show-inheritance:

Item
~~~~

.. autoclass:: pytest.Item()
    :members:
    :show-inheritance:

File
~~~~

.. autoclass:: pytest.File()
    :members:
    :show-inheritance:

FSCollector
~~~~~~~~~~~

.. autoclass:: _pytest.nodes.FSCollector()
    :members:
    :show-inheritance:

Session
~~~~~~~

.. autoclass:: pytest.Session()
    :members:
    :show-inheritance:

Package
~~~~~~~

.. autoclass:: pytest.Package()
    :members:
    :show-inheritance:

Module
~~~~~~

.. autoclass:: pytest.Module()
    :members:
    :show-inheritance:

Class
~~~~~

.. autoclass:: pytest.Class()
    :members:
    :show-inheritance:

Function
~~~~~~~~

.. autoclass:: pytest.Function()
    :members:
    :show-inheritance:

FunctionDefinition
~~~~~~~~~~~~~~~~~~

.. autoclass:: _pytest.python.FunctionDefinition()
    :members:
    :show-inheritance:


Objects
-------

Objects accessible from :ref:`fixtures <fixture>` or :ref:`hooks <hook-reference>`
or importable from ``pytest``.


CallInfo
~~~~~~~~

.. autoclass:: pytest.CallInfo()
    :members:

CollectReport
~~~~~~~~~~~~~

.. autoclass:: pytest.CollectReport()
    :members:
    :show-inheritance:
    :inherited-members:

Config
~~~~~~

.. autoclass:: pytest.Config()
    :members:

Dir
~~~

.. autoclass:: pytest.Dir()
    :members:

Directory
~~~~~~~~~

.. autoclass:: pytest.Directory()
    :members:

ExceptionInfo
~~~~~~~~~~~~~

.. autoclass:: pytest.ExceptionInfo()
    :members:


ExitCode
~~~~~~~~

.. autoclass:: pytest.ExitCode
    :members:


FixtureDef
~~~~~~~~~~

.. autoclass:: pytest.FixtureDef()
    :members:
    :show-inheritance:

MarkDecorator
~~~~~~~~~~~~~

.. autoclass:: pytest.MarkDecorator()
    :members:


MarkGenerator
~~~~~~~~~~~~~

.. autoclass:: pytest.MarkGenerator()
    :members:


Mark
~~~~

.. autoclass:: pytest.Mark()
    :members:


Metafunc
~~~~~~~~

.. autoclass:: pytest.Metafunc()
    :members:

Parser
~~~~~~

.. autoclass:: pytest.Parser()
    :members:

OptionGroup
~~~~~~~~~~~

.. autoclass:: pytest.OptionGroup()
    :members:

PytestPluginManager
~~~~~~~~~~~~~~~~~~~

.. autoclass:: pytest.PytestPluginManager()
    :members:
    :undoc-members:
    :inherited-members:
    :show-inheritance:

RaisesExc
~~~~~~~~~

.. autoclass:: pytest.RaisesExc()
    :members:

    .. autoattribute:: fail_reason

RaisesGroup
~~~~~~~~~~~
**Tutorial**: :ref:`assert-matching-exception-groups`

.. autoclass:: pytest.RaisesGroup()
    :members:

    .. autoattribute:: fail_reason

TerminalReporter
~~~~~~~~~~~~~~~~

.. autoclass:: pytest.TerminalReporter
    :members:
    :inherited-members:

TestReport
~~~~~~~~~~

.. autoclass:: pytest.TestReport()
    :members:
    :show-inheritance:
    :inherited-members:

TestShortLogReport
~~~~~~~~~~~~~~~~~~

.. autoclass:: pytest.TestShortLogReport()
    :members:

Result
~~~~~~~

Result object used within :ref:`hook wrappers <hookwrapper>`, see :py:class:`Result in the pluggy documentation <pluggy.Result>` for more information.

Stash
~~~~~

.. autoclass:: pytest.Stash
    :special-members: __setitem__, __getitem__, __delitem__, __contains__, __len__
    :members:

.. autoclass:: pytest.StashKey
    :show-inheritance:
    :members:


Global Variables
----------------

pytest treats some global variables in a special manner when defined in a test module or
``conftest.py`` files.


.. globalvar:: collect_ignore

**Tutorial**: :ref:`customizing-test-collection`

Can be declared in *conftest.py files* to exclude test directories or modules.
Needs to be a list of paths (``str``, :class:`pathlib.Path` or any :class:`os.PathLike`).

.. code-block:: python

  collect_ignore = ["setup.py"]


.. globalvar:: collect_ignore_glob

**Tutorial**: :ref:`customizing-test-collection`

Can be declared in *conftest.py files* to exclude test directories or modules
with Unix shell-style wildcards. Needs to be ``list[str]`` where ``str`` can
contain glob patterns.

.. code-block:: python

  collect_ignore_glob = ["*_ignore.py"]


.. globalvar:: pytest_plugins

**Tutorial**: :ref:`available installable plugins`

Can be declared at the **global** level in *test modules* and *conftest.py files* to register additional plugins.
Can be either a ``str`` or ``Sequence[str]``.

.. code-block:: python

    pytest_plugins = "myapp.testsupport.myplugin"

.. code-block:: python

    pytest_plugins = ("myapp.testsupport.tools", "myapp.testsupport.regression")


.. globalvar:: pytestmark

**Tutorial**: :ref:`scoped-marking`

Can be declared at the **global** level in *test modules* to apply one or more :ref:`marks <marks ref>` to all
test functions and methods. Can be either a single mark or a list of marks (applied in left-to-right order).

.. code-block:: python

    import pytest

    pytestmark = pytest.mark.webtest


.. code-block:: python

    import pytest

    pytestmark = [pytest.mark.integration, pytest.mark.slow]


Environment Variables
---------------------

Environment variables that can be used to change pytest's behavior.

.. envvar:: CI

When set (regardless of value), pytest acknowledges that is running in a CI process. Alternative to ``BUILD_NUMBER`` variable. See also :ref:`ci-pipelines`.

.. envvar:: BUILD_NUMBER

When set (regardless of value), pytest acknowledges that is running in a CI process. Alternative to CI variable. See also :ref:`ci-pipelines`.

.. envvar:: PYTEST_ADDOPTS

This contains a command-line (parsed by the py:mod:`shlex` module) that will be **prepended** to the command line given
by the user, see :ref:`adding default options` for more information.

.. envvar:: PYTEST_VERSION

This environment variable is defined at the start of the pytest session and is undefined afterwards.
It contains the value of ``pytest.__version__``, and among other things can be used to easily check if a code is running from within a pytest run.

.. envvar:: PYTEST_CURRENT_TEST

This is not meant to be set by users, but is set by pytest internally with the name of the current test so other
processes can inspect it, see :ref:`pytest current test env` for more information.

.. envvar:: PYTEST_DEBUG

When set, pytest will print tracing and debug information.

.. envvar:: PYTEST_DEBUG_TEMPROOT

Root for temporary directories produced by fixtures like :fixture:`tmp_path`
as discussed in :ref:`temporary directory location and retention`.

.. envvar:: PYTEST_DISABLE_PLUGIN_AUTOLOAD

When set, disables plugin auto-loading through :std:doc:`entry point packaging
metadata <packaging:guides/creating-and-discovering-plugins>`. Only plugins
explicitly specified in :envvar:`PYTEST_PLUGINS` or with ``-p`` will be loaded.
See also :ref:`--disable-plugin-autoload <disable_plugin_autoload>`.

.. envvar:: PYTEST_PLUGINS

Contains comma-separated list of modules that should be loaded as plugins:

.. code-block:: bash

    export PYTEST_PLUGINS=mymodule.plugin,xdist

See also ``-p``.

.. envvar:: PYTEST_THEME

Sets a `pygment style <https://pygments.org/docs/styles/>`_ to use for the code output.

.. envvar:: PYTEST_THEME_MODE

Sets the :envvar:`PYTEST_THEME` to be either *dark* or *light*.

.. envvar:: PY_COLORS

When set to ``1``, pytest will use color in terminal output.
When set to ``0``, pytest will not use color.
``PY_COLORS`` takes precedence over ``NO_COLOR`` and ``FORCE_COLOR``.

.. envvar:: NO_COLOR

When set to a non-empty string (regardless of value), pytest will not use color in terminal output.
``PY_COLORS`` takes precedence over ``NO_COLOR``, which takes precedence over ``FORCE_COLOR``.
See `no-color.org <https://no-color.org/>`__ for other libraries supporting this community standard.

.. envvar:: FORCE_COLOR

When set to a non-empty string (regardless of value), pytest will use color in terminal output.
``PY_COLORS`` and ``NO_COLOR`` take precedence over ``FORCE_COLOR``.

Exceptions
----------

.. autoexception:: pytest.UsageError()
    :show-inheritance:

.. autoexception:: pytest.FixtureLookupError()
    :show-inheritance:

.. _`warnings ref`:

Warnings
--------

Custom warnings generated in some situations such as improper usage or deprecated features.

.. autoclass:: pytest.PytestWarning
   :show-inheritance:

.. autoclass:: pytest.PytestAssertRewriteWarning
   :show-inheritance:

.. autoclass:: pytest.PytestCacheWarning
   :show-inheritance:

.. autoclass:: pytest.PytestCollectionWarning
   :show-inheritance:

.. autoclass:: pytest.PytestConfigWarning
   :show-inheritance:

.. autoclass:: pytest.PytestDeprecationWarning
   :show-inheritance:

.. autoclass:: pytest.PytestExperimentalApiWarning
   :show-inheritance:

.. autoclass:: pytest.PytestReturnNotNoneWarning
  :show-inheritance:

.. autoclass:: pytest.PytestRemovedIn9Warning
  :show-inheritance:

.. autoclass:: pytest.PytestUnknownMarkWarning
   :show-inheritance:

.. autoclass:: pytest.PytestUnraisableExceptionWarning
   :show-inheritance:

.. autoclass:: pytest.PytestUnhandledThreadExceptionWarning
   :show-inheritance:


Consult the :ref:`internal-warnings` section in the documentation for more information.


.. _`ini options ref`:

Configuration Options
---------------------

Here is a list of builtin configuration options that may be written in a ``pytest.ini`` (or ``.pytest.ini``),
``pyproject.toml``, ``tox.ini``, or ``setup.cfg`` file, usually located at the root of your repository.

To see each file format in details, see :ref:`config file formats`.

.. warning::
    Usage of ``setup.cfg`` is not recommended except for very simple use cases. ``.cfg``
    files use a different parser than ``pytest.ini`` and ``tox.ini`` which might cause hard to track
    down problems.
    When possible, it is recommended to use the latter files, or ``pyproject.toml``, to hold your pytest configuration.

Configuration options may be overwritten in the command-line by using ``-o/--override-ini``, which can also be
passed multiple times. The expected format is ``name=value``. For example::

   pytest -o console_output_style=classic -o cache_dir=/tmp/mycache


.. confval:: addopts

   Add the specified ``OPTS`` to the set of command line arguments as if they
   had been specified by the user. Example: if you have this ini file content:

   .. code-block:: ini

        # content of pytest.ini
        [pytest]
        addopts = --maxfail=2 -rf  # exit after 2 failures, report fail info

   issuing ``pytest test_hello.py`` actually means:

   .. code-block:: bash

        pytest --maxfail=2 -rf test_hello.py

   Default is to add no options.


.. confval:: cache_dir

   Sets the directory where the cache plugin's content is stored. Default directory is
   ``.pytest_cache`` which is created in :ref:`rootdir <rootdir>`. Directory may be
   relative or absolute path. If setting relative path, then directory is created
   relative to :ref:`rootdir <rootdir>`. Additionally, a path may contain environment
   variables, that will be expanded. For more information about cache plugin
   please refer to :ref:`cache_provider`.

.. confval:: collect_imported_tests

   .. versionadded:: 8.4

   Setting this to ``false`` will make pytest collect classes/functions from test
   files **only** if they are defined in that file (as opposed to imported there).

   .. code-block:: ini

        [pytest]
        collect_imported_tests = false

   Default: ``true``

   pytest traditionally collects classes/functions in the test module namespace even if they are imported from another file.

   For example:

   .. code-block:: python

       # contents of src/domain.py
       class Testament: ...


       # contents of tests/test_testament.py
       from domain import Testament


       def test_testament(): ...

   In this scenario, with the default options, pytest will collect the class `Testament` from `tests/test_testament.py` because it starts with `Test`, even though in this case it is a production class being imported in the test module namespace.

   Set ``collected_imported_tests`` to ``false`` in the configuration file prevents that.

.. confval:: consider_namespace_packages

   Controls if pytest should attempt to identify `namespace packages <https://packaging.python.org/en/latest/guides/packaging-namespace-packages>`__
   when collecting Python modules. Default is ``False``.

   Set to ``True`` if the package you are testing is part of a namespace package.

   Only `native namespace packages <https://packaging.python.org/en/latest/guides/packaging-namespace-packages/#native-namespace-packages>`__
   are supported, with no plans to support `legacy namespace packages <https://packaging.python.org/en/latest/guides/packaging-namespace-packages/#legacy-namespace-packages>`__.

   .. versionadded:: 8.1

.. confval:: console_output_style

   Sets the console output style while running tests:

   * ``classic``: classic pytest output.
   * ``progress``: like classic pytest output, but with a progress indicator.
   * ``progress-even-when-capture-no``: allows the use of the progress indicator even when ``capture=no``.
   * ``count``: like progress, but shows progress as the number of tests completed instead of a percent.
   * ``times``: show tests duration.

   The default is ``progress``, but you can fallback to ``classic`` if you prefer or
   the new mode is causing unexpected problems:

   .. code-block:: ini

        # content of pytest.ini
        [pytest]
        console_output_style = classic


.. confval:: disable_test_id_escaping_and_forfeit_all_rights_to_community_support

   .. versionadded:: 4.4

   pytest by default escapes any non-ascii characters used in unicode strings
   for the parametrization because it has several downsides.
   If however you would like to use unicode strings in parametrization
   and see them in the terminal as is (non-escaped), use this option
   in your ``pytest.ini``:

   .. code-block:: ini

       [pytest]
       disable_test_id_escaping_and_forfeit_all_rights_to_community_support = True

   Keep in mind however that this might cause unwanted side effects and
   even bugs depending on the OS used and plugins currently installed,
   so use it at your own risk.

   Default: ``False``.

   See :ref:`parametrizemark`.

.. confval:: doctest_encoding



   Default encoding to use to decode text files with docstrings.
   :ref:`See how pytest handles doctests <doctest>`.


.. confval:: doctest_optionflags

   One or more doctest flag names from the standard ``doctest`` module.
   :ref:`See how pytest handles doctests <doctest>`.


.. confval:: empty_parameter_set_mark



    Allows to pick the action for empty parametersets in parameterization

    * ``skip`` skips tests with an empty parameterset (default)
    * ``xfail`` marks tests with an empty parameterset as xfail(run=False)
    * ``fail_at_collect`` raises an exception if parametrize collects an empty parameter set

    .. code-block:: ini

      # content of pytest.ini
      [pytest]
      empty_parameter_set_mark = xfail

    .. note::

      The default value of this option is planned to change to ``xfail`` in future releases
      as this is considered less error prone, see :issue:`3155` for more details.


.. confval:: faulthandler_timeout

   Dumps the tracebacks of all threads if a test takes longer than ``X`` seconds to run (including
   fixture setup and teardown). Implemented using the :func:`faulthandler.dump_traceback_later` function,
   so all caveats there apply.

   .. code-block:: ini

        # content of pytest.ini
        [pytest]
        faulthandler_timeout=5

   For more information please refer to :ref:`faulthandler`.

.. confval:: filterwarnings



   Sets a list of filters and actions that should be taken for matched
   warnings. By default all warnings emitted during the test session
   will be displayed in a summary at the end of the test session.

   .. code-block:: ini

        # content of pytest.ini
        [pytest]
        filterwarnings =
            error
            ignore::DeprecationWarning

   This tells pytest to ignore deprecation warnings and turn all other warnings
   into errors. For more information please refer to :ref:`warnings`.


.. confval:: junit_duration_report

    .. versionadded:: 4.1

    Configures how durations are recorded into the JUnit XML report:

    * ``total`` (the default): duration times reported include setup, call, and teardown times.
    * ``call``: duration times reported include only call times, excluding setup and teardown.

    .. code-block:: ini

        [pytest]
        junit_duration_report = call


.. confval:: junit_family

    .. versionadded:: 4.2
    .. versionchanged:: 6.1
        Default changed to ``xunit2``.

    Configures the format of the generated JUnit XML file. The possible options are:

    * ``xunit1`` (or ``legacy``): produces old style output, compatible with the xunit 1.0 format.
    * ``xunit2``: produces `xunit 2.0 style output <https://github.com/jenkinsci/xunit-plugin/blob/xunit-2.3.2/src/main/resources/org/jenkinsci/plugins/xunit/types/model/xsd/junit-10.xsd>`__, which should be more compatible with latest Jenkins versions.  **This is the default**.

    .. code-block:: ini

        [pytest]
        junit_family = xunit2


.. confval:: junit_logging

    .. versionadded:: 3.5
    .. versionchanged:: 5.4
        ``log``, ``all``, ``out-err`` options added.

    Configures if captured output should be written to the JUnit XML file. Valid values are:

    * ``log``: write only ``logging`` captured output.
    * ``system-out``: write captured ``stdout`` contents.
    * ``system-err``: write captured ``stderr`` contents.
    * ``out-err``: write both captured ``stdout`` and ``stderr`` contents.
    * ``all``: write captured ``logging``, ``stdout`` and ``stderr`` contents.
    * ``no`` (the default): no captured output is written.

    .. code-block:: ini

        [pytest]
        junit_logging = system-out


.. confval:: junit_log_passing_tests

    .. versionadded:: 4.6

    If ``junit_logging != "no"``, configures if the captured output should be written
    to the JUnit XML file for **passing** tests. Default is ``True``.

    .. code-block:: ini

        [pytest]
        junit_log_passing_tests = False


.. confval:: junit_suite_name

    To set the name of the root test suite xml item, you can configure the ``junit_suite_name`` option in your config file:

    .. code-block:: ini

        [pytest]
        junit_suite_name = my_suite

.. confval:: log_auto_indent

    Allow selective auto-indentation of multiline log messages.

    Supports command line option ``--log-auto-indent [value]``
    and config option ``log_auto_indent = [value]`` to set the
    auto-indentation behavior for all logging.

    ``[value]`` can be:
        * True or "On" - Dynamically auto-indent multiline log messages
        * False or "Off" or 0 - Do not auto-indent multiline log messages (the default behavior)
        * [positive integer] - auto-indent multiline log messages by [value] spaces

    .. code-block:: ini

        [pytest]
        log_auto_indent = False

    Supports passing kwarg ``extra={"auto_indent": [value]}`` to
    calls to ``logging.log()`` to specify auto-indentation behavior for
    a specific entry in the log. ``extra`` kwarg overrides the value specified
    on the command line or in the config.

.. confval:: log_cli

    Enable log display during test run (also known as :ref:`"live logging" <live_logs>`).
    The default is ``False``.

    .. code-block:: ini

        [pytest]
        log_cli = True

.. confval:: log_cli_date_format



    Sets a :py:func:`time.strftime`-compatible string that will be used when formatting dates for live logging.

    .. code-block:: ini

        [pytest]
        log_cli_date_format = %Y-%m-%d %H:%M:%S

    For more information, see :ref:`live_logs`.

.. confval:: log_cli_format



    Sets a :py:mod:`logging`-compatible string used to format live logging messages.

    .. code-block:: ini

        [pytest]
        log_cli_format = %(asctime)s %(levelname)s %(message)s

    For more information, see :ref:`live_logs`.


.. confval:: log_cli_level



    Sets the minimum log message level that should be captured for live logging. The integer value or
    the names of the levels can be used.

    .. code-block:: ini

        [pytest]
        log_cli_level = INFO

    For more information, see :ref:`live_logs`.


.. confval:: log_date_format



    Sets a :py:func:`time.strftime`-compatible string that will be used when formatting dates for logging capture.

    .. code-block:: ini

        [pytest]
        log_date_format = %Y-%m-%d %H:%M:%S

    For more information, see :ref:`logging`.


.. confval:: log_file



    Sets a file name relative to the current working directory where log messages should be written to, in addition
    to the other logging facilities that are active.

    .. code-block:: ini

        [pytest]
        log_file = logs/pytest-logs.txt

    For more information, see :ref:`logging`.


.. confval:: log_file_date_format



    Sets a :py:func:`time.strftime`-compatible string that will be used when formatting dates for the logging file.

    .. code-block:: ini

        [pytest]
        log_file_date_format = %Y-%m-%d %H:%M:%S

    For more information, see :ref:`logging`.

.. confval:: log_file_format



    Sets a :py:mod:`logging`-compatible string used to format logging messages redirected to the logging file.

    .. code-block:: ini

        [pytest]
        log_file_format = %(asctime)s %(levelname)s %(message)s

    For more information, see :ref:`logging`.

.. confval:: log_file_level



    Sets the minimum log message level that should be captured for the logging file. The integer value or
    the names of the levels can be used.

    .. code-block:: ini

        [pytest]
        log_file_level = INFO

    For more information, see :ref:`logging`.


.. confval:: log_format



    Sets a :py:mod:`logging`-compatible string used to format captured logging messages.

    .. code-block:: ini

        [pytest]
        log_format = %(asctime)s %(levelname)s %(message)s

    For more information, see :ref:`logging`.


.. confval:: log_level



    Sets the minimum log message level that should be captured for logging capture. The integer value or
    the names of the levels can be used.

    .. code-block:: ini

        [pytest]
        log_level = INFO

    For more information, see :ref:`logging`.


.. confval:: markers

    When the ``--strict-markers`` or ``--strict`` command-line arguments are used,
    only known markers - defined in code by core pytest or some plugin - are allowed.

    You can list additional markers in this setting to add them to the whitelist,
    in which case you probably want to add ``--strict-markers`` to ``addopts``
    to avoid future regressions:

    .. code-block:: ini

        [pytest]
        addopts = --strict-markers
        markers =
            slow
            serial

    .. note::
        The use of ``--strict-markers`` is highly preferred. ``--strict`` was kept for
        backward compatibility only and may be confusing for others as it only applies to
        markers and not to other options.

.. confval:: minversion

   Specifies a minimal pytest version required for running tests.

   .. code-block:: ini

        # content of pytest.ini
        [pytest]
        minversion = 3.0  # will fail if we run with pytest-2.8


.. confval:: norecursedirs

   Set the directory basename patterns to avoid when recursing
   for test discovery.  The individual (fnmatch-style) patterns are
   applied to the basename of a directory to decide if to recurse into it.
   Pattern matching characters::

        *       matches everything
        ?       matches any single character
        [seq]   matches any character in seq
        [!seq]  matches any char not in seq

   Default patterns are ``'*.egg'``, ``'.*'``, ``'_darcs'``, ``'build'``,
   ``'CVS'``, ``'dist'``, ``'node_modules'``, ``'venv'``, ``'{arch}'``.
   Setting a ``norecursedirs`` replaces the default.  Here is an example of
   how to avoid certain directories:

   .. code-block:: ini

        [pytest]
        norecursedirs = .svn _build tmp*

   This would tell ``pytest`` to not look into typical subversion or
   sphinx-build directories or into any ``tmp`` prefixed directory.

   Additionally, ``pytest`` will attempt to intelligently identify and ignore
   a virtualenv.  Any directory deemed to be the root of a virtual environment
   will not be considered during test collection unless
   ``--collect-in-virtualenv`` is given.  Note also that ``norecursedirs``
   takes precedence over ``--collect-in-virtualenv``; e.g. if you intend to
   run tests in a virtualenv with a base directory that matches ``'.*'`` you
   *must* override ``norecursedirs`` in addition to using the
   ``--collect-in-virtualenv`` flag.


.. confval:: python_classes

   One or more name prefixes or glob-style patterns determining which classes
   are considered for test collection. Search for multiple glob patterns by
   adding a space between patterns. By default, pytest will consider any
   class prefixed with ``Test`` as a test collection.  Here is an example of how
   to collect tests from classes that end in ``Suite``:

   .. code-block:: ini

        [pytest]
        python_classes = *Suite

   Note that ``unittest.TestCase`` derived classes are always collected
   regardless of this option, as ``unittest``'s own collection framework is used
   to collect those tests.


.. confval:: python_files

   One or more Glob-style file patterns determining which python files
   are considered as test modules. Search for multiple glob patterns by
   adding a space between patterns:

   .. code-block:: ini

        [pytest]
        python_files = test_*.py check_*.py example_*.py

   Or one per line:

   .. code-block:: ini

        [pytest]
        python_files =
            test_*.py
            check_*.py
            example_*.py

   By default, files matching ``test_*.py`` and ``*_test.py`` will be considered
   test modules.


.. confval:: python_functions

   One or more name prefixes or glob-patterns determining which test functions
   and methods are considered tests. Search for multiple glob patterns by
   adding a space between patterns. By default, pytest will consider any
   function prefixed with ``test`` as a test.  Here is an example of how
   to collect test functions and methods that end in ``_test``:

   .. code-block:: ini

        [pytest]
        python_functions = *_test

   Note that this has no effect on methods that live on a ``unittest.TestCase``
   derived class, as ``unittest``'s own collection framework is used
   to collect those tests.

   See :ref:`change naming conventions` for more detailed examples.


.. confval:: pythonpath

   Sets list of directories that should be added to the python search path.
   Directories will be added to the head of :data:`sys.path`.
   Similar to the :envvar:`PYTHONPATH` environment variable, the directories will be
   included in where Python will look for imported modules.
   Paths are relative to the :ref:`rootdir <rootdir>` directory.
   Directories remain in path for the duration of the test session.

   .. code-block:: ini

        [pytest]
        pythonpath = src1 src2


.. confval:: required_plugins

   A space separated list of plugins that must be present for pytest to run.
   Plugins can be listed with or without version specifiers directly following
   their name. Whitespace between different version specifiers is not allowed.
   If any one of the plugins is not found, emit an error.

   .. code-block:: ini

       [pytest]
       required_plugins = pytest-django>=3.0.0,<4.0.0 pytest-html pytest-xdist>=1.0.0


.. confval:: testpaths

   Sets list of directories that should be searched for tests when
   no specific directories, files or test ids are given in the command line when
   executing pytest from the :ref:`rootdir <rootdir>` directory.
   File system paths may use shell-style wildcards, including the recursive
   ``**`` pattern.

   Useful when all project tests are in a known location to speed up
   test collection and to avoid picking up undesired tests by accident.

   .. code-block:: ini

        [pytest]
        testpaths = testing doc

   This configuration means that executing:

   .. code-block:: console

       pytest

   has the same practical effects as executing:

   .. code-block:: console

       pytest testing doc

.. confval:: tmp_path_retention_count

   How many sessions should we keep the `tmp_path` directories,
   according to `tmp_path_retention_policy`.

   .. code-block:: ini

        [pytest]
        tmp_path_retention_count = 3

   Default: ``3``


.. confval:: tmp_path_retention_policy



   Controls which directories created by the `tmp_path` fixture are kept around,
   based on test outcome.

    * `all`: retains directories for all tests, regardless of the outcome.
    * `failed`: retains directories only for tests with outcome `error` or `failed`.
    * `none`: directories are always removed after each test ends, regardless of the outcome.

   .. code-block:: ini

        [pytest]
        tmp_path_retention_policy = all

   Default: ``all``


.. confval:: truncation_limit_chars

   Controls maximum number of characters to truncate assertion message contents.

   Setting value to ``0`` disables the character limit for truncation.

   .. code-block:: ini

       [pytest]
       truncation_limit_chars = 640

   pytest truncates the assert messages to a certain limit by default to prevent comparison with large data to overload the console output.

   Default: ``640``

   .. note::

        If pytest detects it is :ref:`running on CI <ci-pipelines>`, truncation is disabled automatically.


.. confval:: truncation_limit_lines

   Controls maximum number of linesto truncate assertion message contents.

   Setting value to ``0`` disables the lines limit for truncation.

   .. code-block:: ini

       [pytest]
       truncation_limit_lines = 8

   pytest truncates the assert messages to a certain limit by default to prevent comparison with large data to overload the console output.

   Default: ``8``

   .. note::

        If pytest detects it is :ref:`running on CI <ci-pipelines>`, truncation is disabled automatically.


.. confval:: usefixtures

    List of fixtures that will be applied to all test functions; this is semantically the same to apply
    the ``@pytest.mark.usefixtures`` marker to all test functions.


    .. code-block:: ini

        [pytest]
        usefixtures =
            clean_db


.. confval:: verbosity_assertions

    Set a verbosity level specifically for assertion related output, overriding the application wide level.

    .. code-block:: ini

        [pytest]
        verbosity_assertions = 2

    Defaults to application wide verbosity level (via the ``-v`` command-line option). A special value of
    "auto" can be used to explicitly use the global verbosity level.


.. confval:: verbosity_test_cases

    Set a verbosity level specifically for test case execution related output, overriding the application wide level.

    .. code-block:: ini

        [pytest]
        verbosity_test_cases = 2

    Defaults to application wide verbosity level (via the ``-v`` command-line option). A special value of
    "auto" can be used to explicitly use the global verbosity level.


.. confval:: xfail_strict

    If set to ``True``, tests marked with ``@pytest.mark.xfail`` that actually succeed will by default fail the
    test suite.
    For more information, see :ref:`xfail strict tutorial`.


    .. code-block:: ini

        [pytest]
        xfail_strict = True


.. _`command-line-flags`:

Command-line Flags
------------------

All the command-line flags can be obtained by running ``pytest --help``::

    $ pytest --help
    usage: pytest [options] [file_or_dir] [file_or_dir] [...]

    positional arguments:
      file_or_dir

    general:
      -k EXPRESSION         Only run tests which match the given substring
                            expression. An expression is a Python evaluable
                            expression where all names are substring-matched
                            against test names and their parent classes.
                            Example: -k 'test_method or test_other' matches all
                            test functions and classes whose name contains
                            'test_method' or 'test_other', while -k 'not
                            test_method' matches those that don't contain
                            'test_method' in their names. -k 'not test_method
                            and not test_other' will eliminate the matches.
                            Additionally keywords are matched to classes and
                            functions containing extra names in their
                            'extra_keyword_matches' set, as well as functions
                            which have names assigned directly to them. The
                            matching is case-insensitive.
      -m MARKEXPR           Only run tests matching given mark expression. For
                            example: -m 'mark1 and not mark2'.
      --markers             show markers (builtin, plugin and per-project ones).
      -x, --exitfirst       Exit instantly on first error or failed test
      --maxfail=num         Exit after first num failures or errors
      --strict-config       Any warnings encountered while parsing the `pytest`
                            section of the configuration file raise errors
      --strict-markers      Markers not registered in the `markers` section of
                            the configuration file raise errors
      --strict              (Deprecated) alias to --strict-markers
      --fixtures, --funcargs
                            Show available fixtures, sorted by plugin appearance
                            (fixtures with leading '_' are only shown with '-v')
      --fixtures-per-test   Show fixtures per test
      --pdb                 Start the interactive Python debugger on errors or
                            KeyboardInterrupt
      --pdbcls=modulename:classname
                            Specify a custom interactive Python debugger for use
                            with --pdb.For example:
                            --pdbcls=IPython.terminal.debugger:TerminalPdb
      --trace               Immediately break when running each test
      --capture=method      Per-test capturing method: one of fd|sys|no|tee-sys
      -s                    Shortcut for --capture=no
      --runxfail            Report the results of xfail tests as if they were
                            not marked
      --lf, --last-failed   Rerun only the tests that failed at the last run (or
                            all if none failed)
      --ff, --failed-first  Run all tests, but run the last failures first. This
                            may re-order tests and thus lead to repeated fixture
                            setup/teardown.
      --nf, --new-first     Run tests from new files first, then the rest of the
                            tests sorted by file mtime
      --cache-show=[CACHESHOW]
                            Show cache contents, don't perform collection or
                            tests. Optional argument: glob (default: '*').
      --cache-clear         Remove all cache contents at start of test run
      --lfnf, --last-failed-no-failures={all,none}
                            With ``--lf``, determines whether to execute tests
                            when there are no previously (known) failures or
                            when no cached ``lastfailed`` data was found.
                            ``all`` (the default) runs the full test suite
                            again. ``none`` just emits a message about no known
                            failures and exits successfully.
      --sw, --stepwise      Exit on test failure and continue from last failing
                            test next time
      --sw-skip, --stepwise-skip
                            Ignore the first failing test but stop on the next
                            failing test. Implicitly enables --stepwise.
      --sw-reset, --stepwise-reset
                            Resets stepwise state, restarting the stepwise
                            workflow. Implicitly enables --stepwise.

    Reporting:
      --durations=N         Show N slowest setup/test durations (N=0 for all)
      --durations-min=N     Minimal duration in seconds for inclusion in slowest
                            list. Default: 0.005 (or 0.0 if -vv is given).
      -v, --verbose         Increase verbosity
      --no-header           Disable header
      --no-summary          Disable summary
      --no-fold-skipped     Do not fold skipped tests in short summary.
      --force-short-summary
                            Force condensed summary output regardless of
                            verbosity level.
      -q, --quiet           Decrease verbosity
      --verbosity=VERBOSE   Set verbosity. Default: 0.
      -r chars              Show extra test summary info as specified by chars:
                            (f)ailed, (E)rror, (s)kipped, (x)failed, (X)passed,
                            (p)assed, (P)assed with output, (a)ll except passed
                            (p/P), or (A)ll. (w)arnings are enabled by default
                            (see --disable-warnings), 'N' can be used to reset
                            the list. (default: 'fE').
      --disable-warnings, --disable-pytest-warnings
                            Disable warnings summary
      -l, --showlocals      Show locals in tracebacks (disabled by default)
      --no-showlocals       Hide locals in tracebacks (negate --showlocals
                            passed through addopts)
      --tb=style            Traceback print mode
                            (auto/long/short/line/native/no)
      --xfail-tb            Show tracebacks for xfail (as long as --tb != no)
      --show-capture={no,stdout,stderr,log,all}
                            Controls how captured stdout/stderr/log is shown on
                            failed tests. Default: all.
      --full-trace          Don't cut any tracebacks (default is to cut)
      --color=color         Color terminal output (yes/no/auto)
      --code-highlight={yes,no}
                            Whether code should be highlighted (only if --color
                            is also enabled). Default: yes.
      --pastebin=mode       Send failed|all info to bpaste.net pastebin service
      --junitxml, --junit-xml=path
                            Create junit-xml style report file at given path
      --junitprefix, --junit-prefix=str
                            Prepend prefix to classnames in junit-xml output

    pytest-warnings:
      -W, --pythonwarnings PYTHONWARNINGS
                            Set which warnings to report, see -W option of
                            Python itself

    collection:
      --collect-only, --co  Only collect tests, don't execute them
      --pyargs              Try to interpret all arguments as Python packages
      --ignore=path         Ignore path during collection (multi-allowed)
      --ignore-glob=path    Ignore path pattern during collection (multi-
                            allowed)
      --deselect=nodeid_prefix
                            Deselect item (via node id prefix) during collection
                            (multi-allowed)
      --confcutdir=dir      Only load conftest.py's relative to specified dir
      --noconftest          Don't load any conftest.py files
      --keep-duplicates     Keep duplicate tests
      --collect-in-virtualenv
                            Don't ignore tests in a local virtualenv directory
      --continue-on-collection-errors
                            Force test execution even if collection errors occur
      --import-mode={prepend,append,importlib}
                            Prepend/append to sys.path when importing test
                            modules and conftest files. Default: prepend.
      --doctest-modules     Run doctests in all .py modules
      --doctest-report={none,cdiff,ndiff,udiff,only_first_failure}
                            Choose another output format for diffs on doctest
                            failure
      --doctest-glob=pat    Doctests file matching pattern, default: test*.txt
      --doctest-ignore-import-errors
                            Ignore doctest collection errors
      --doctest-continue-on-failure
                            For a given doctest, continue to run after the first
                            failure

    test session debugging and configuration:
      -c, --config-file FILE
                            Load configuration from `FILE` instead of trying to
                            locate one of the implicit configuration files.
      --rootdir=ROOTDIR     Define root directory for tests. Can be relative
                            path: 'root_dir', './root_dir',
                            'root_dir/another_dir/'; absolute path:
                            '/home/user/root_dir'; path with variables:
                            '$HOME/root_dir'.
      --basetemp=dir        Base temporary directory for this test run.
                            (Warning: this directory is removed if it exists.)
      -V, --version         Display pytest version and information about
                            plugins. When given twice, also display information
                            about plugins.
      -h, --help            Show help message and configuration info
      -p name               Early-load given plugin module name or entry point
                            (multi-allowed). To avoid loading of plugins, use
                            the `no:` prefix, e.g. `no:doctest`. See also
                            --disable-plugin-autoload.
      --disable-plugin-autoload
                            Disable plugin auto-loading through entry point
                            packaging metadata. Only plugins explicitly
                            specified in -p or env var PYTEST_PLUGINS will be
                            loaded.
      --trace-config        Trace considerations of conftest.py files
      --debug=[DEBUG_FILE_NAME]
                            Store internal tracing debug information in this log
                            file. This file is opened with 'w' and truncated as
                            a result, care advised. Default: pytestdebug.log.
      -o, --override-ini OVERRIDE_INI
                            Override ini option with "option=value" style, e.g.
                            `-o xfail_strict=True -o cache_dir=cache`.
      --assert=MODE         Control assertion debugging tools.
                            'plain' performs no assertion debugging.
                            'rewrite' (the default) rewrites assert statements
                            in test modules on import to provide assert
                            expression information.
      --setup-only          Only setup fixtures, do not execute tests
      --setup-show          Show setup of fixtures while executing tests
      --setup-plan          Show what fixtures and tests would be executed but
                            don't execute anything

    logging:
      --log-level=LEVEL     Level of messages to catch/display. Not set by
                            default, so it depends on the root/parent log
                            handler's effective level, where it is "WARNING" by
                            default.
      --log-format=LOG_FORMAT
                            Log format used by the logging module
      --log-date-format=LOG_DATE_FORMAT
                            Log date format used by the logging module
      --log-cli-level=LOG_CLI_LEVEL
                            CLI logging level
      --log-cli-format=LOG_CLI_FORMAT
                            Log format used by the logging module
      --log-cli-date-format=LOG_CLI_DATE_FORMAT
                            Log date format used by the logging module
      --log-file=LOG_FILE   Path to a file when logging will be written to
      --log-file-mode={w,a}
                            Log file open mode
      --log-file-level=LOG_FILE_LEVEL
                            Log file logging level
      --log-file-format=LOG_FILE_FORMAT
                            Log format used by the logging module
      --log-file-date-format=LOG_FILE_DATE_FORMAT
                            Log date format used by the logging module
      --log-auto-indent=LOG_AUTO_INDENT
                            Auto-indent multiline messages passed to the logging
                            module. Accepts true|on, false|off or an integer.
      --log-disable=LOGGER_DISABLE
                            Disable a logger by name. Can be passed multiple
                            times.

    [pytest] ini-options in the first pytest.ini|tox.ini|setup.cfg|pyproject.toml file found:

      markers (linelist):   Register new markers for test functions
      empty_parameter_set_mark (string):
                            Default marker for empty parametersets
      filterwarnings (linelist):
                            Each line specifies a pattern for
                            warnings.filterwarnings. Processed after
                            -W/--pythonwarnings.
      norecursedirs (args): Directory patterns to avoid for recursion
      testpaths (args):     Directories to search for tests when no files or
                            directories are given on the command line
      collect_imported_tests (bool):
                            Whether to collect tests in imported modules outside
                            `testpaths`
      consider_namespace_packages (bool):
                            Consider namespace packages when resolving module
                            names during import
      usefixtures (args):   List of default fixtures to be used with this
                            project
      python_files (args):  Glob-style file patterns for Python test module
                            discovery
      python_classes (args):
                            Prefixes or glob names for Python test class
                            discovery
      python_functions (args):
                            Prefixes or glob names for Python test function and
                            method discovery
      disable_test_id_escaping_and_forfeit_all_rights_to_community_support (bool):
                            Disable string escape non-ASCII characters, might
                            cause unwanted side effects(use at your own risk)
      console_output_style (string):
                            Console output: "classic", or with additional
                            progress information ("progress" (percentage) |
                            "count" | "progress-even-when-capture-no" (forces
                            progress even when capture=no)
      verbosity_test_cases (string):
                            Specify a verbosity level for test case execution,
                            overriding the main level. Higher levels will
                            provide more detailed information about each test
                            case executed.
      xfail_strict (bool):  Default for the strict parameter of xfail markers
                            when not given explicitly (default: False)
      tmp_path_retention_count (string):
                            How many sessions should we keep the `tmp_path`
                            directories, according to
                            `tmp_path_retention_policy`.
      tmp_path_retention_policy (string):
                            Controls which directories created by the `tmp_path`
                            fixture are kept around, based on test outcome.
                            (all/failed/none)
      enable_assertion_pass_hook (bool):
                            Enables the pytest_assertion_pass hook. Make sure to
                            delete any previously generated pyc cache files.
      truncation_limit_lines (string):
                            Set threshold of LINES after which truncation will
                            take effect
      truncation_limit_chars (string):
                            Set threshold of CHARS after which truncation will
                            take effect
      verbosity_assertions (string):
                            Specify a verbosity level for assertions, overriding
                            the main level. Higher levels will provide more
                            detailed explanation when an assertion fails.
      junit_suite_name (string):
                            Test suite name for JUnit report
      junit_logging (string):
                            Write captured log messages to JUnit report: one of
                            no|log|system-out|system-err|out-err|all
      junit_log_passing_tests (bool):
                            Capture log information for passing tests to JUnit
                            report:
      junit_duration_report (string):
                            Duration time to report: one of total|call
      junit_family (string):
                            Emit XML for schema: one of legacy|xunit1|xunit2
      doctest_optionflags (args):
                            Option flags for doctests
      doctest_encoding (string):
                            Encoding used for doctest files
      cache_dir (string):   Cache directory path
      log_level (string):   Default value for --log-level
      log_format (string):  Default value for --log-format
      log_date_format (string):
                            Default value for --log-date-format
      log_cli (bool):       Enable log display during test run (also known as
                            "live logging")
      log_cli_level (string):
                            Default value for --log-cli-level
      log_cli_format (string):
                            Default value for --log-cli-format
      log_cli_date_format (string):
                            Default value for --log-cli-date-format
      log_file (string):    Default value for --log-file
      log_file_mode (string):
                            Default value for --log-file-mode
      log_file_level (string):
                            Default value for --log-file-level
      log_file_format (string):
                            Default value for --log-file-format
      log_file_date_format (string):
                            Default value for --log-file-date-format
      log_auto_indent (string):
                            Default value for --log-auto-indent
      faulthandler_timeout (string):
                            Dump the traceback of all threads if a test takes
                            more than TIMEOUT seconds to finish
      addopts (args):       Extra command line options
      minversion (string):  Minimally required pytest version
      pythonpath (paths):   Add paths to sys.path
      required_plugins (args):
                            Plugins that must be present for pytest to run

    Environment variables:
      CI                       When set (regardless of value), pytest knows it is running in a CI process and does not truncate summary info
      BUILD_NUMBER             Equivalent to CI
      PYTEST_ADDOPTS           Extra command line options
      PYTEST_PLUGINS           Comma-separated plugins to load during startup
      PYTEST_DISABLE_PLUGIN_AUTOLOAD Set to disable plugin auto-loading
      PYTEST_DEBUG             Set to enable debug tracing of pytest's internals


    to see available markers type: pytest --markers
    to see available fixtures type: pytest --fixtures
    (shown according to specified file_or_dir or current dir if not specified; fixtures with leading '_' are only shown with the '-v' option