PEP-415 states that `exception.__context__` should be suppressed
in traceback outputs, if `exception.__suppress_context__` is
`True`.
Now if a ``raise exception from None`` is caught by pytest,
pytest will no longer chain the context in the test report.
The algorithm in `FormattedExcinfo` now better matches the one
in `traceback.TracebackException`.
`Exception.__suppress_context__` is available in all of the
versions of Python 3 that are supported by pytest.
Fixes#2631.
fixtures.reorder_items is non-deterministic because it reorders based
on iteration over an (unordered) set. Change the code to use an
OrderedDict instead so that we get deterministic behaviour, fixes#920.
Allow a class method decorated `@staticmethod` to be collected as a test
function (if it meets the usual criteria).
This feature will not work in Python 2.6 -- static methods will still be
ignored there.
This works by adding an argparse Action that will raise an exception in
order to skip the rest of the argument parsing. This prevents argparse
from quitting due to missing required arguments, similar to the way that
the builtin argparse --help option is implemented by raising SystemExit.
Fixes: #1999
Descriptors (e.g. properties) such as in the added test case are
triggered during collection, executing arbitrary code which can raise.
Previously, such exceptions were propagated and failed the collection.
Now these exceptions are caught and the corresponding attributes are
silently ignored.
A better solution would be to completely skip access to all custom
descriptors, such that the offending code doesn't even trigger. However
I think this requires manually going through the instance and all of its
MRO for each and every attribute checking if it might be a proper
fixture before accessing it. So I took the easy route here.
In other words, putting something like this in your test class is still
a bad idea...:
@property
def innocent(self):
os.system('rm -rf /')
Fixes#2234.
Ronny Pfannschmidt
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Ronny Pfannschmidt