pytest-2.4.0: new fixture features/hooks and bug fixes
The just released pytest-2.4.0 brings many improvements and numerous
bug fixes while remaining plugin- and test-suite compatible apart
from a few supposedly very minor incompatibilities. See below for
a full list of details. A few feature highlights:
- new yield-style fixtures pytest.yield_fixture, allowing to use
existing with-style context managers in fixture functions.
- improved pdb support: import pdb ; pdb.set_trace() now works
without requiring prior disabling of stdout/stderr capturing.
Also the --pdb options works now on collection and internal errors
and we introduced a new experimental hook for IDEs/plugins to
intercept debugging: pytest_exception_interact(node, call, report).
- shorter monkeypatch variant to allow specifying an import path as
a target, for example: monkeypatch.setattr("requests.get", myfunc)
- better unittest/nose compatibility: all teardown methods are now only
called if the corresponding setup method succeeded.
- integrate tab-completion on command line options if you
- allow boolean expression directly with skipif/xfail
if a “reason” is also specified.
- a new hook pytest_load_initial_conftests allows plugins like
influence the environment before conftest files import django.
- reporting: color the last line red or green depending if
failures/errors occured or everything passed.
The documentation has been updated to accomodate the changes,
To install or upgrade pytest:
pip install -U pytest # or
easy_install -U pytest
Many thanks to all who helped, including Floris Bruynooghe,
Brianna Laugher, Andreas Pelme, Anthon van der Neut, Anatoly Bubenkoff,
Vladimir Keleshev, Mathieu Agopian, Ronny Pfannschmidt, Christian
Theunert and many others.
may passing tests be with you,
Changes between 2.3.5 and 2.4
- if calling –genscript from python2.7 or above, you only get a
standalone script which works on python2.7 or above. Use Python2.6
to also get a python2.5 compatible version.
- all xunit-style teardown methods (nose-style, pytest-style,
unittest-style) will not be called if the corresponding setup method failed,
see issue322 below.
- the pytest_plugin_unregister hook wasn’t ever properly called
and there is no known implementation of the hook - so it got removed.
- pytest.fixture-decorated functions cannot be generators (i.e. use
yield) anymore. This change might be reversed in 2.4.1 if it causes
unforeseen real-life issues. However, you can always write and return
an inner function/generator and change the fixture consumer to iterate
over the returned generator. This change was done in lieu of the new
pytest.yield_fixture decorator, see below.
experimentally introduce a new pytest.yield_fixture decorator
which accepts exactly the same parameters as pytest.fixture but
mandates a yield statement instead of a return statement from
fixture functions. This allows direct integration with “with-style”
context managers in fixture functions and generally avoids registering
of finalization callbacks in favour of treating the “after-yield” as
teardown code. Thanks Andreas Pelme, Vladimir Keleshev, Floris
Bruynooghe, Ronny Pfannschmidt and many others for discussions.
allow boolean expression directly with skipif/xfail
if a “reason” is also specified. Rework skipping documentation
to recommend “condition as booleans” because it prevents surprises
when importing markers between modules. Specifying conditions
as strings will remain fully supported.
reporting: color the last line red or green depending if
failures/errors occured or everything passed. thanks Christian
make “import pdb ; pdb.set_trace()” work natively wrt capturing (no
“-s” needed anymore), making pytest.set_trace() a mere shortcut.
fix issue181: –pdb now also works on collect errors (and
on internal errors) . This was implemented by a slight internal
refactoring and the introduction of a new hook
pytest_exception_interact hook (see next item).
fix issue341: introduce new experimental hook for IDEs/terminals to
intercept debugging: pytest_exception_interact(node, call, report).
new monkeypatch.setattr() variant to provide a shorter
invocation for patching out classes/functions from modules:
will replace the “get” function of the “requests” module with myfunc.
fix issue322: tearDownClass is not run if setUpClass failed. Thanks
Mathieu Agopian for the initial fix. Also make all of pytest/nose
finalizer mimick the same generic behaviour: if a setupX exists and
fails, don’t run teardownX. This internally introduces a new method
“node.addfinalizer()” helper which can only be called during the setup
phase of a node.
simplify pytest.mark.parametrize() signature: allow to pass a
CSV-separated string to specify argnames. For example:
pytest.mark.parametrize("input,expected", [(1,2), (2,3)])
works as well as the previous:
pytest.mark.parametrize(("input", "expected"), ...).
add support for setUpModule/tearDownModule detection, thanks Brian Okken.
integrate tab-completion on options through use of “argcomplete”.
Thanks Anthon van der Neut for the PR.
change option names to be hyphen-separated long options but keep the
old spelling backward compatible. py.test -h will only show the
hyphenated version, for example “–collect-only” but “–collectonly”
will remain valid as well (for backward-compat reasons). Many thanks to
Anthon van der Neut for the implementation and to Hynek Schlawack for
fix issue 308 - allow to mark/xfail/skip individual parameter sets
when parametrizing. Thanks Brianna Laugher.
call new experimental pytest_load_initial_conftests hook to allow
3rd party plugins to do something before a conftest is loaded.
- fix issue358 - capturing options are now parsed more properly
by using a new parser.parse_known_args method.
- pytest now uses argparse instead of optparse (thanks Anthon) which
means that “argparse” is added as a dependency if installing into python2.6
environments or below.
- fix issue333: fix a case of bad unittest/pytest hook interaction.
- PR27: correctly handle nose.SkipTest during collection. Thanks
Antonio Cuni, Ronny Pfannschmidt.
- fix issue355: junitxml puts name=”pytest” attribute to testsuite tag.
- fix issue336: autouse fixture in plugins should work again.
- fix issue279: improve object comparisons on assertion failure
for standard datatypes and recognise collections.abc. Thanks to
Brianna Laugher and Mathieu Agopian.
- fix issue317: assertion rewriter support for the is_package method
- fix issue335: document py.code.ExceptionInfo() object returned
from pytest.raises(), thanks Mathieu Agopian.
- remove implicit distribute_setup support from setup.py.
- fix issue305: ignore any problems when writing pyc files.
- SO-17664702: call fixture finalizers even if the fixture function
partially failed (finalizers would not always be called before)
- fix issue320 - fix class scope for fixtures when mixed with
module-level functions. Thanks Anatloy Bubenkoff.
- you can specify “-q” or “-qq” to get different levels of “quieter”
reporting (thanks Katarzyna Jachim)
- fix issue300 - Fix order of conftest loading when starting py.test
in a subdirectory.
- fix issue323 - sorting of many module-scoped arg parametrizations
- make sessionfinish hooks execute with the same cwd-context as at
session start (helps fix plugin behaviour which write output files
with relative path such as pytest-cov)
- fix issue316 - properly reference collection hooks in docs
- fix issue 306 - cleanup of -k/-m options to only match markers/test
names/keywords respectively. Thanks Wouter van Ackooy.
- improved doctest counting for doctests in python modules –
files without any doctest items will not show up anymore
and doctest examples are counted as separate test items.
thanks Danilo Bellini.
- fix issue245 by depending on the released py-1.4.14
which fixes py.io.dupfile to work with files with no
mode. Thanks Jason R. Coombs.
- fix junitxml generation when test output contains control characters,
addressing issue267, thanks Jaap Broekhuizen
- fix issue338: honor –tb style for setup/teardown errors as well. Thanks Maho.
- fix issue307 - use yaml.safe_load in example, thanks Mark Eichin.
- better parametrize error messages, thanks Brianna Laugher
- pytest_terminal_summary(terminalreporter) hooks can now use
”.section(title)” and ”.line(msg)” methods to print extra
information at the end of a test run.