192 lines
7.0 KiB
ReStructuredText
192 lines
7.0 KiB
ReStructuredText
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.. _`pytest helpers`:
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Pytest API and builtin fixtures
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================================================
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Most of the information of this page has been moved over to :ref:`api-reference`.
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For information on plugin hooks and objects, see :ref:`plugins`.
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For information on the ``pytest.mark`` mechanism, see :ref:`mark`.
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For information about fixtures, see :ref:`fixtures`. To see a complete list of available fixtures (add ``-v`` to also see fixtures with leading ``_``), type :
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.. code-block:: pytest
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$ pytest -q --fixtures
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cache
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Return a cache object that can persist state between testing sessions.
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cache.get(key, default)
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cache.set(key, value)
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Keys must be ``/`` separated strings, where the first part is usually the
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name of your plugin or application to avoid clashes with other cache users.
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Values can be any object handled by the json stdlib module.
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capsys
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Enable text capturing of writes to ``sys.stdout`` and ``sys.stderr``.
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The captured output is made available via ``capsys.readouterr()`` method
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calls, which return a ``(out, err)`` namedtuple.
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``out`` and ``err`` will be ``text`` objects.
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capsysbinary
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Enable bytes capturing of writes to ``sys.stdout`` and ``sys.stderr``.
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The captured output is made available via ``capsysbinary.readouterr()``
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method calls, which return a ``(out, err)`` namedtuple.
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``out`` and ``err`` will be ``bytes`` objects.
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capfd
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Enable text capturing of writes to file descriptors ``1`` and ``2``.
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The captured output is made available via ``capfd.readouterr()`` method
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calls, which return a ``(out, err)`` namedtuple.
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``out`` and ``err`` will be ``text`` objects.
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capfdbinary
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Enable bytes capturing of writes to file descriptors ``1`` and ``2``.
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The captured output is made available via ``capfd.readouterr()`` method
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calls, which return a ``(out, err)`` namedtuple.
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``out`` and ``err`` will be ``byte`` objects.
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doctest_namespace [session scope]
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Fixture that returns a :py:class:`dict` that will be injected into the
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namespace of doctests.
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pytestconfig [session scope]
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Session-scoped fixture that returns the :class:`pytest.Config` object.
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Example::
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def test_foo(pytestconfig):
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if pytestconfig.getoption("verbose") > 0:
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...
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record_property
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Add extra properties to the calling test.
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User properties become part of the test report and are available to the
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configured reporters, like JUnit XML.
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The fixture is callable with ``name, value``. The value is automatically
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XML-encoded.
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Example::
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def test_function(record_property):
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record_property("example_key", 1)
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record_xml_attribute
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Add extra xml attributes to the tag for the calling test.
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The fixture is callable with ``name, value``. The value is
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automatically XML-encoded.
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record_testsuite_property [session scope]
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Record a new ``<property>`` tag as child of the root ``<testsuite>``.
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This is suitable to writing global information regarding the entire test
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suite, and is compatible with ``xunit2`` JUnit family.
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This is a ``session``-scoped fixture which is called with ``(name, value)``. Example:
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.. code-block:: python
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def test_foo(record_testsuite_property):
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record_testsuite_property("ARCH", "PPC")
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record_testsuite_property("STORAGE_TYPE", "CEPH")
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``name`` must be a string, ``value`` will be converted to a string and properly xml-escaped.
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.. warning::
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Currently this fixture **does not work** with the
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`pytest-xdist <https://github.com/pytest-dev/pytest-xdist>`__ plugin. See issue
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`#7767 <https://github.com/pytest-dev/pytest/issues/7767>`__ for details.
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caplog
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Access and control log capturing.
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Captured logs are available through the following properties/methods::
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* caplog.messages -> list of format-interpolated log messages
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* caplog.text -> string containing formatted log output
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* caplog.records -> list of logging.LogRecord instances
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* caplog.record_tuples -> list of (logger_name, level, message) tuples
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* caplog.clear() -> clear captured records and formatted log output string
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monkeypatch
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A convenient fixture for monkey-patching.
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The fixture provides these methods to modify objects, dictionaries or
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os.environ::
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monkeypatch.setattr(obj, name, value, raising=True)
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monkeypatch.delattr(obj, name, raising=True)
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monkeypatch.setitem(mapping, name, value)
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monkeypatch.delitem(obj, name, raising=True)
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monkeypatch.setenv(name, value, prepend=None)
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monkeypatch.delenv(name, raising=True)
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monkeypatch.syspath_prepend(path)
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monkeypatch.chdir(path)
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All modifications will be undone after the requesting test function or
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fixture has finished. The ``raising`` parameter determines if a KeyError
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or AttributeError will be raised if the set/deletion operation has no target.
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recwarn
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Return a :class:`WarningsRecorder` instance that records all warnings emitted by test functions.
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See https://docs.python.org/library/how-to/capture-warnings.html for information
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on warning categories.
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tmpdir_factory [session scope]
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Return a :class:`pytest.TempdirFactory` instance for the test session.
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tmp_path_factory [session scope]
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Return a :class:`pytest.TempPathFactory` instance for the test session.
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tmpdir
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Return a temporary directory path object which is unique to each test
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function invocation, created as a sub directory of the base temporary
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directory.
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By default, a new base temporary directory is created each test session,
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and old bases are removed after 3 sessions, to aid in debugging. If
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``--basetemp`` is used then it is cleared each session. See :ref:`base
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temporary directory`.
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The returned object is a `py.path.local`_ path object.
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.. _`py.path.local`: https://py.readthedocs.io/en/latest/path.html
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tmp_path
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Return a temporary directory path object which is unique to each test
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function invocation, created as a sub directory of the base temporary
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directory.
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By default, a new base temporary directory is created each test session,
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and old bases are removed after 3 sessions, to aid in debugging. If
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``--basetemp`` is used then it is cleared each session. See :ref:`base
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temporary directory`.
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The returned object is a :class:`pathlib.Path` object.
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no tests ran in 0.12s
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You can also interactively ask for help, e.g. by typing on the Python interactive prompt something like:
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.. code-block:: python
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import pytest
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help(pytest)
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