New submission from Alex Waygood <alex.wayg...@gmail.com>:

`test_functools` includes a test to check that `functools.singledispatch` 
correctly wraps the attributes of the target function. However, there is no 
equivalent test for `functools.singledispatchmethod`. There should be, as this 
is done separately in the `__get__` method of `functools.singledispatchmethod`; 
it is a different mechanism to `functools.singledispatch`.

Additionally, `test_abstractmethod_register` tests that the return value of 
`singledispatchmethod.__get__` wraps the target function's 
`__isabstractmethod__` attribute. However, the `__isabstractmethod__` property 
of the `singledispatchmethod` class is untested.

----------
components: Library (Lib)
messages: 405366
nosy: AlexWaygood, lukasz.langa, rhettinger
priority: normal
severity: normal
status: open
title: `functools.singledispatchmethod` is missing tests
type: behavior
versions: Python 3.10, Python 3.11, Python 3.9

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue45678>
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