[New-bugs-announce] [issue2661] Mapping tests cannot be passed by user implementations
report at bugs.python.org
Sun Apr 20 00:09:33 CEST 2008
New submission from David Anderson <dave at natulte.net>:
Some test cases in Lib/test/mapping_tests.py are problematic for users
wishing to test their own implementations of the mapping protocol:
- TestHashMappingProtocol.test_repr() requires the user implementations
to look like a dict when repr() is applied. It is unclear why this is
required of conforming mapping protocol implementations.
- TestMappingProtocol.test_fromkeys() cannot pass for any
implementation that uses its constructor in fromkeys(), because baddict1
defines a constructor accepting no arguments. It should accept *args,
**kwargs to be sane for user implementations that handle passing data
sources to the constructor.
- TestHashMappingProtocol.test_mutatingiteration(), for some faulty
implementations, makes the iteration degrade into an infinite loop.
Making the test more strict (eg. keeping an explicit iteration count and
failing if it goes >1) would be more helpful to buggy implementations.
These all seem like trivial issues. If it is agreed that the repr_test
should be removed from the ABC tests, I can provide a patch implementing
these three corrections.
components: Library (Lib)
title: Mapping tests cannot be passed by user implementations
versions: Python 3.0
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