Pytest

=========================

Breaking Changes
----------------

- `12089 <https://github.com/pytest-dev/pytest/pull/12089>`_: pytest now requires that :class:`unittest.TestCase` subclasses can be instantiated freely using ``MyTestCase('runTest')``.

If the class doesn't allow this, you may see an error during collection such as ``AttributeError: 'MyTestCase' object has no attribute 'runTest'``.

Classes which do not override ``__init__``, or do not access the test method in ``__init__`` using ``getattr`` or similar, are unaffected.

Classes which do should take care to not crash when ``"runTest"`` is given, as is shown in `unittest.TestCases's implementation <https://github.com/python/cpython/blob/51aefc5bf907ddffaaf083ded0de773adcdf08c8/Lib/unittest/case.py#L419-L426>`_.
Alternatively, consider using :meth:`setUp <unittest.TestCase.setUp>` instead of ``__init__``.

If you run into this issue using ``tornado.AsyncTestCase``, please see `issue 12263 <https://github.com/pytest-dev/pytest/issues/12263>`_.

If you run into this issue using an abstract ``TestCase`` subclass, please see `issue 12275 <https://github.com/pytest-dev/pytest/issues/12275>`_.

Historical note: the effect of this change on custom TestCase implementations was not properly considered initially, this is why it was done in a minor release. We apologize for the inconvenience.

Deprecations
------------

- `12069 <https://github.com/pytest-dev/pytest/issues/12069>`_: A deprecation warning is now raised when implementations of one of the following hooks request a deprecated ``py.path.local`` parameter instead of the ``pathlib.Path`` parameter which replaced it:

- :hook:`pytest_ignore_collect` - the ``path`` parameter - use ``collection_path`` instead.
- :hook:`pytest_collect_file` - the ``path`` parameter - use ``file_path`` instead.
- :hook:`pytest_pycollect_makemodule` - the ``path`` parameter - use ``module_path`` instead.
- :hook:`pytest_report_header` - the ``startdir`` parameter - use ``start_path`` instead.
- :hook:`pytest_report_collectionfinish` - the ``startdir`` parameter - use ``start_path`` instead.

The replacement parameters are available since pytest 7.0.0.
The old parameters will be removed in pytest 9.0.0.

See :ref:`legacy-path-hooks-deprecated` for more details.



Features
--------

- `11871 <https://github.com/pytest-dev/pytest/issues/11871>`_: Added support for reading command line arguments from a file using the prefix character `, like e.g.: ``pytest tests.txt``. The file must have one argument per line.

See :ref:`Read arguments from file <args-from-file>` for details.



Improvements
------------

- `11523 <https://github.com/pytest-dev/pytest/issues/11523>`_: :func:`pytest.importorskip` will now issue a warning if the module could be found, but raised :class:`ImportError` instead of :class:`ModuleNotFoundError`.

The warning can be suppressed by passing ``exc_type=ImportError`` to :func:`pytest.importorskip`.

See :ref:`import-or-skip-import-error` for details.


- `11728 <https://github.com/pytest-dev/pytest/issues/11728>`_: For ``unittest``-based tests, exceptions during class cleanup (as raised by functions registered with :meth:`TestCase.addClassCleanup <unittest.TestCase.addClassCleanup>`) are now reported instead of silently failing.


- `11777 <https://github.com/pytest-dev/pytest/issues/11777>`_: Text is no longer truncated in the ``short test summary info`` section when ``-vv`` is given.


- `12112 <https://github.com/pytest-dev/pytest/issues/12112>`_: Improved namespace packages detection when :confval:`consider_namespace_packages` is enabled, covering more situations (like editable installs).


- `9502 <https://github.com/pytest-dev/pytest/issues/9502>`_: Added :envvar:`PYTEST_VERSION` environment variable which is defined at the start of the pytest session and undefined afterwards. It contains the value of ``pytest.__version__``, and among other things can be used to easily check if code is running from within a pytest run.



Bug Fixes
---------

- `12065 <https://github.com/pytest-dev/pytest/issues/12065>`_: Fixed a regression in pytest 8.0.0 where test classes containing ``setup_method`` and tests using ``staticmethod`` or ``classmethod`` would crash with ``AttributeError: 'NoneType' object has no attribute 'setup_method'``.

Now the :attr:`request.instance <pytest.FixtureRequest.instance>` attribute of tests using ``staticmethod`` and ``classmethod`` is no longer ``None``, but a fresh instance of the class, like in non-static methods.
Previously it was ``None``, and all fixtures of such tests would share a single ``self``.


- `12135 <https://github.com/pytest-dev/pytest/issues/12135>`_: Fixed issue where fixtures adding their finalizer multiple times to fixtures they request would cause unreliable and non-intuitive teardown ordering in some instances.


- `12194 <https://github.com/pytest-dev/pytest/issues/12194>`_: Fixed a bug with ``--importmode=importlib`` and ``--doctest-modules`` where child modules did not appear as attributes in parent modules.


- `1489 <https://github.com/pytest-dev/pytest/issues/1489>`_: Fixed some instances where teardown of higher-scoped fixtures was not happening in the reverse order they were initialized in.



Trivial/Internal Changes
------------------------

- `12069 <https://github.com/pytest-dev/pytest/issues/12069>`_: ``pluggy>=1.5.0`` is now required.


- `12167 <https://github.com/pytest-dev/pytest/issues/12167>`_: :ref:`cache <cache>`: create supporting files (``CACHEDIR.TAG``, ``.gitignore``, etc.) in a temporary directory to provide atomic semantics.

=========================

Bug Fixes
---------

- `12114 <https://github.com/pytest-dev/pytest/issues/12114>`_: Fixed error in :func:`pytest.approx` when used with `numpy` arrays and comparing with other types.

=========================

.. note::

This release is not a usual bug fix release -- it contains features and improvements, being a follow up
to ``8.1.0``, which has been yanked from PyPI.

Features
--------

- `11475 <https://github.com/pytest-dev/pytest/issues/11475>`_: Added the new :confval:`consider_namespace_packages` configuration option, defaulting to ``False``.

If set to ``True``, pytest will attempt to identify modules that are part of `namespace packages <https://packaging.python.org/en/latest/guides/packaging-namespace-packages>`__ when importing modules.


- `11653 <https://github.com/pytest-dev/pytest/issues/11653>`_: Added the new :confval:`verbosity_test_cases` configuration option for fine-grained control of test execution verbosity.
See :ref:`Fine-grained verbosity <pytest.fine_grained_verbosity>` for more details.



Improvements
------------

- `10865 <https://github.com/pytest-dev/pytest/issues/10865>`_: :func:`pytest.warns` now validates that :func:`warnings.warn` was called with a `str` or a `Warning`.
Currently in Python it is possible to use other types, however this causes an exception when :func:`warnings.filterwarnings` is used to filter those warnings (see `CPython 103577 <https://github.com/python/cpython/issues/103577>`__ for a discussion).
While this can be considered a bug in CPython, we decided to put guards in pytest as the error message produced without this check in place is confusing.


- `11311 <https://github.com/pytest-dev/pytest/issues/11311>`_: When using ``--override-ini`` for paths in invocations without a configuration file defined, the current working directory is used
as the relative directory.

Previously this would raise an :class:`AssertionError`.


- `11475 <https://github.com/pytest-dev/pytest/issues/11475>`_: :ref:`--import-mode=importlib <import-mode-importlib>` now tries to import modules using the standard import mechanism (but still without changing :py:data:`sys.path`), falling back to importing modules directly only if that fails.

This means that installed packages will be imported under their canonical name if possible first, for example ``app.core.models``, instead of having the module name always be derived from their path (for example ``.env310.lib.site_packages.app.core.models``).


- `11801 <https://github.com/pytest-dev/pytest/issues/11801>`_: Added the :func:`iter_parents() <_pytest.nodes.Node.iter_parents>` helper method on nodes.
It is similar to :func:`listchain <_pytest.nodes.Node.listchain>`, but goes from bottom to top, and returns an iterator, not a list.


- `11850 <https://github.com/pytest-dev/pytest/issues/11850>`_: Added support for :data:`sys.last_exc` for post-mortem debugging on Python>=3.12.


- `11962 <https://github.com/pytest-dev/pytest/issues/11962>`_: In case no other suitable candidates for configuration file are found, a ``pyproject.toml`` (even without a ``[tool.pytest.ini_options]`` table) will be considered as the configuration file and define the ``rootdir``.


- `11978 <https://github.com/pytest-dev/pytest/issues/11978>`_: Add ``--log-file-mode`` option to the logging plugin, enabling appending to log-files. This option accepts either ``"w"`` or ``"a"`` and defaults to ``"w"``.

Previously, the mode was hard-coded to be ``"w"`` which truncates the file before logging.


- `12047 <https://github.com/pytest-dev/pytest/issues/12047>`_: When multiple finalizers of a fixture raise an exception, now all exceptions are reported as an exception group.
Previously, only the first exception was reported.



Bug Fixes
---------

- `11475 <https://github.com/pytest-dev/pytest/issues/11475>`_: Fixed regression where ``--importmode=importlib`` would import non-test modules more than once.


- `11904 <https://github.com/pytest-dev/pytest/issues/11904>`_: Fixed a regression in pytest 8.0.0 that would cause test collection to fail due to permission errors when using ``--pyargs``.

This change improves the collection tree for tests specified using ``--pyargs``, see :pr:`12043` for a comparison with pytest 8.0 and <8.


- `12011 <https://github.com/pytest-dev/pytest/issues/12011>`_: Fixed a regression in 8.0.1 whereby ``setup_module`` xunit-style fixtures are not executed when ``--doctest-modules`` is passed.


- `12014 <https://github.com/pytest-dev/pytest/issues/12014>`_: Fix the ``stacklevel`` used when warning about marks used on fixtures.


- `12039 <https://github.com/pytest-dev/pytest/issues/12039>`_: Fixed a regression in ``8.0.2`` where tests created using :fixture:`tmp_path` have been collected multiple times in CI under Windows.


Improved Documentation
----------------------

- `11790 <https://github.com/pytest-dev/pytest/issues/11790>`_: Documented the retention of temporary directories created using the ``tmp_path`` fixture in more detail.



Trivial/Internal Changes
------------------------

- `11785 <https://github.com/pytest-dev/pytest/issues/11785>`_: Some changes were made to private functions which may affect plugins which access them:

- ``FixtureManager._getautousenames()`` now takes a ``Node`` itself instead of the nodeid.
- ``FixtureManager.getfixturedefs()`` now takes the ``Node`` itself instead of the nodeid.
- The ``_pytest.nodes.iterparentnodeids()`` function is removed without replacement.
Prefer to traverse the node hierarchy itself instead.
If you really need to, copy the function from the previous pytest release.


- `12069 <https://github.com/pytest-dev/pytest/issues/12069>`_: Delayed the deprecation of the following features to ``9.0.0``:

* :ref:`node-ctor-fspath-deprecation`.
* :ref:`legacy-path-hooks-deprecated`.

It was discovered after ``8.1.0`` was released that the warnings about the impeding removal were not being displayed, so the team decided to revert the removal.

This is the reason for ``8.1.0`` being yanked.

=====================


.. note::

This release has been **yanked**: it broke some plugins without the proper warning period, due to
some warnings not showing up as expected.

See `12069 <https://github.com/pytest-dev/pytest/issues/12069>`__.

=========================

Bug Fixes
---------

- `11895 <https://github.com/pytest-dev/pytest/issues/11895>`_: Fix collection on Windows where initial paths contain the short version of a path (for example ``c:\PROGRA~1\tests``).


- `11953 <https://github.com/pytest-dev/pytest/issues/11953>`_: Fix an ``IndexError`` crash raising from ``getstatementrange_ast``.


- `12021 <https://github.com/pytest-dev/pytest/issues/12021>`_: Reverted a fix to `--maxfail` handling in pytest 8.0.0 because it caused a regression in pytest-xdist whereby session fixture teardowns may get executed multiple times when the max-fails is reached.

=========================

Bug Fixes
---------

- `11875 <https://github.com/pytest-dev/pytest/issues/11875>`_: Correctly handle errors from :func:`getpass.getuser` in Python 3.13.


- `11879 <https://github.com/pytest-dev/pytest/issues/11879>`_: Fix an edge case where ``ExceptionInfo._stringify_exception`` could crash :func:`pytest.raises`.


- `11906 <https://github.com/pytest-dev/pytest/issues/11906>`_: Fix regression with :func:`pytest.warns` using custom warning subclasses which have more than one parameter in their `__init__`.


- `11907 <https://github.com/pytest-dev/pytest/issues/11907>`_: Fix a regression in pytest 8.0.0 whereby calling :func:`pytest.skip` and similar control-flow exceptions within a :func:`pytest.warns()` block would get suppressed instead of propagating.


- `11929 <https://github.com/pytest-dev/pytest/issues/11929>`_: Fix a regression in pytest 8.0.0 whereby autouse fixtures defined in a module get ignored by the doctests in the module.


- `11937 <https://github.com/pytest-dev/pytest/issues/11937>`_: Fix a regression in pytest 8.0.0 whereby items would be collected in reverse order in some circumstances.