192 lines
7.0 KiB
ReStructuredText
192 lines
7.0 KiB
ReStructuredText
:orphan:
|
|
|
|
.. _`pytest helpers`:
|
|
|
|
Pytest API and builtin fixtures
|
|
================================================
|
|
|
|
|
|
Most of the information of this page has been moved over to :ref:`reference`.
|
|
|
|
For information on plugin hooks and objects, see :ref:`plugins`.
|
|
|
|
For information on the ``pytest.mark`` mechanism, see :ref:`mark`.
|
|
|
|
For information about fixtures, see :ref:`fixtures`. To see a complete list of available fixtures (add ``-v`` to also see fixtures with leading ``_``), type :
|
|
|
|
.. code-block:: pytest
|
|
|
|
$ pytest -q --fixtures
|
|
cache
|
|
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
|
|
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
|
|
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
|
|
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
|
|
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]
|
|
Fixture that returns a :py:class:`dict` that will be injected into the
|
|
namespace of doctests.
|
|
|
|
pytestconfig [session scope]
|
|
Session-scoped fixture that returns the :class:`_pytest.config.Config` object.
|
|
|
|
Example::
|
|
|
|
def test_foo(pytestconfig):
|
|
if pytestconfig.getoption("verbose") > 0:
|
|
...
|
|
|
|
record_property
|
|
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
|
|
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]
|
|
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 <https://github.com/pytest-dev/pytest/issues/7767>`__ for details.
|
|
|
|
caplog
|
|
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
|
|
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=False)
|
|
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
|
|
Return a :class:`WarningsRecorder` instance that records all warnings emitted by test functions.
|
|
|
|
See http://docs.python.org/library/warnings.html for information
|
|
on warning categories.
|
|
|
|
tmpdir_factory [session scope]
|
|
Return a :class:`pytest.TempdirFactory` instance for the test session.
|
|
|
|
tmp_path_factory [session scope]
|
|
Return a :class:`pytest.TempPathFactory` instance for the test session.
|
|
|
|
tmpdir
|
|
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 `py.path.local`_ path object.
|
|
|
|
.. _`py.path.local`: https://py.readthedocs.io/en/latest/path.html
|
|
|
|
tmp_path
|
|
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:
|
|
|
|
.. code-block:: python
|
|
|
|
import pytest
|
|
|
|
help(pytest)
|