Pytest API and builtin fixtures

Most of the information of this page has been moved over to API Reference.

For information on plugin hooks and objects, see Writing plugins.

For information on the pytest.mark mechanism, see How to mark test functions with attributes.

For information about fixtures, see Fixtures reference. To see a complete list of available fixtures (add -v to also see fixtures with leading _), type :

$ pytest  --fixtures -v
=========================== test session starts ============================
platform linux -- Python 3.x.y, pytest-7.x.y, pluggy-1.x.y -- $PYTHON_PREFIX/bin/python
cachedir: .pytest_cache
rootdir: /home/sweet/project
collected 0 items
cache -- .../_pytest/cacheprovider.py:510
    Return a cache object that can persist state between testing sessions.

    cache.get(key, default)
    cache.set(key, value)

    Keys must be ``/`` separated strings, where the first part is usually the
    name of your plugin or application to avoid clashes with other cache users.

    Values can be any object handled by the json stdlib module.

capsys -- .../_pytest/capture.py:878
    Enable text capturing of writes to ``sys.stdout`` and ``sys.stderr``.

    The captured output is made available via ``capsys.readouterr()`` method
    calls, which return a ``(out, err)`` namedtuple.
    ``out`` and ``err`` will be ``text`` objects.

capsysbinary -- .../_pytest/capture.py:895
    Enable bytes capturing of writes to ``sys.stdout`` and ``sys.stderr``.

    The captured output is made available via ``capsysbinary.readouterr()``
    method calls, which return a ``(out, err)`` namedtuple.
    ``out`` and ``err`` will be ``bytes`` objects.

capfd -- .../_pytest/capture.py:912
    Enable text capturing of writes to file descriptors ``1`` and ``2``.

    The captured output is made available via ``capfd.readouterr()`` method
    calls, which return a ``(out, err)`` namedtuple.
    ``out`` and ``err`` will be ``text`` objects.

capfdbinary -- .../_pytest/capture.py:929
    Enable bytes capturing of writes to file descriptors ``1`` and ``2``.

    The captured output is made available via ``capfd.readouterr()`` method
    calls, which return a ``(out, err)`` namedtuple.
    ``out`` and ``err`` will be ``byte`` objects.

doctest_namespace [session scope] -- .../_pytest/doctest.py:731
    Fixture that returns a :py:class:`dict` that will be injected into the
    namespace of doctests.

pytestconfig [session scope] -- .../_pytest/fixtures.py:1365
    Session-scoped fixture that returns the session's :class:`pytest.Config`
    object.

    Example::

        def test_foo(pytestconfig):
            if pytestconfig.getoption("verbose") > 0:
                ...

record_property -- .../_pytest/junitxml.py:282
    Add extra properties to the calling test.

    User properties become part of the test report and are available to the
    configured reporters, like JUnit XML.

    The fixture is callable with ``name, value``. The value is automatically
    XML-encoded.

    Example::

        def test_function(record_property):
            record_property("example_key", 1)

record_xml_attribute -- .../_pytest/junitxml.py:305
    Add extra xml attributes to the tag for the calling test.

    The fixture is callable with ``name, value``. The value is
    automatically XML-encoded.

record_testsuite_property [session scope] -- .../_pytest/junitxml.py:343
    Record a new ``<property>`` tag as child of the root ``<testsuite>``.

    This is suitable to writing global information regarding the entire test
    suite, and is compatible with ``xunit2`` JUnit family.

    This is a ``session``-scoped fixture which is called with ``(name, value)``. Example:

    .. code-block:: python

        def test_foo(record_testsuite_property):
            record_testsuite_property("ARCH", "PPC")
            record_testsuite_property("STORAGE_TYPE", "CEPH")

    ``name`` must be a string, ``value`` will be converted to a string and properly xml-escaped.

    .. warning::

        Currently this fixture **does not work** with the
        `pytest-xdist <https://github.com/pytest-dev/pytest-xdist>`__ plugin. See
        :issue:`7767` for details.

tmpdir_factory [session scope] -- .../_pytest/legacypath.py:295
    Return a :class:`pytest.TempdirFactory` instance for the test session.

tmpdir -- .../_pytest/legacypath.py:302
    Return a temporary directory path object which is unique to each test
    function invocation, created as a sub directory of the base temporary
    directory.

    By default, a new base temporary directory is created each test session,
    and old bases are removed after 3 sessions, to aid in debugging. If
    ``--basetemp`` is used then it is cleared each session. See :ref:`base
    temporary directory`.

    The returned object is a `legacy_path`_ object.

    .. _legacy_path: https://py.readthedocs.io/en/latest/path.html

caplog -- .../_pytest/logging.py:483
    Access and control log capturing.

    Captured logs are available through the following properties/methods::

    * caplog.messages        -> list of format-interpolated log messages
    * caplog.text            -> string containing formatted log output
    * caplog.records         -> list of logging.LogRecord instances
    * caplog.record_tuples   -> list of (logger_name, level, message) tuples
    * caplog.clear()         -> clear captured records and formatted log output string

monkeypatch -- .../_pytest/monkeypatch.py:29
    A convenient fixture for monkey-patching.

    The fixture provides these methods to modify objects, dictionaries or
    os.environ::

        monkeypatch.setattr(obj, name, value, raising=True)
        monkeypatch.delattr(obj, name, raising=True)
        monkeypatch.setitem(mapping, name, value)
        monkeypatch.delitem(obj, name, raising=True)
        monkeypatch.setenv(name, value, prepend=None)
        monkeypatch.delenv(name, raising=True)
        monkeypatch.syspath_prepend(path)
        monkeypatch.chdir(path)

    All modifications will be undone after the requesting test function or
    fixture has finished. The ``raising`` parameter determines if a KeyError
    or AttributeError will be raised if the set/deletion operation has no target.

recwarn -- .../_pytest/recwarn.py:29
    Return a :class:`WarningsRecorder` instance that records all warnings emitted by test functions.

    See https://docs.python.org/library/how-to/capture-warnings.html for information
    on warning categories.

tmp_path_factory [session scope] -- .../_pytest/tmpdir.py:183
    Return a :class:`pytest.TempPathFactory` instance for the test session.

tmp_path -- .../_pytest/tmpdir.py:198
    Return a temporary directory path object which is unique to each test
    function invocation, created as a sub directory of the base temporary
    directory.

    By default, a new base temporary directory is created each test session,
    and old bases are removed after 3 sessions, to aid in debugging. If
    ``--basetemp`` is used then it is cleared each session. See :ref:`base
    temporary directory`.

    The returned object is a :class:`pathlib.Path` object.


========================== no tests ran in 0.12s ===========================

You can also interactively ask for help, e.g. by typing on the Python interactive prompt something like:

import pytest

help(pytest)