[Python-Dev] incompatible unittest changes

Collin Winter collinw at gmail.com
Sat Oct 20 00:51:51 CEST 2007

On 10/19/07, Jean-Paul Calderone <exarkun at divmod.com> wrote:
> In trunk after 2.5, equality and hashing for TestCase were added, changing the behavior so that two instances of TestCase for the same test method hash the same and compare equal.  This means two instances of TestCase for the same test method cannot be added to a single set.
> Here's the change:
> http://svn.python.org/view/python/trunk/Lib/unittest.py?rev=54199&r1=42115&r2=54199
> The implementations aren't even very good, since they prevent another type from deciding that it wants to customize comparison against TestCase (or TestSuite,
> or FunctionTestCase) instances.

The implementations have been changed in a more recent revision.

> Is there a real use case for this functionality?  If not, I'd like it to be
> removed to restore the old behavior.

The use-case was problems I encountered when writing the test suite
for unittest. If you can find a way to implement the functionality you
want *and* keep the test suite reasonably straightforward, I'll be
happy to review your patch.

Collin Winter

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