For code that uses annotations / signature, wrapping a callable in a Mock object does not work correctly:

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import typing, inspect, functools from unittest.mock import Mock

def incr(i: int) -> int: ... return i+1 ... wrapped = Mock(wraps=incr) inspect.signature(wrapped) <Signature (*args, **kwargs)> typing.get_type_hints(wrapped) Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/usr/local/lib/python3.11/typing.py", line 2330, in get_type_hints raise TypeError('{!r} is not a module, class, method, ' TypeError: <Mock id='140078552596944'> is not a module, class, method, or function. functools.update_wrapper(wrapped, incr) <Mock id='140078552596944'> inspect.signature(wrapped) <Signature (i: int) -> int> typing.get_type_hints(wrapped) {'i': <class 'int'>, 'return': <class 'int'>}

It's relatively simple to call update_wrapper on your own, but it seems like it would be better if the mock "just worked" for code that tries to use signature and annotations at runtime. I think all that's required would be adding `if wraps is not None: functools.update_wrapper(self, wraps)` after the line here: https://github.com/python/cpython/blob/f4fcfdf8c593611f98b9358cc0c5604c15306... Does anyone see any problems with implementing this? Thanks & best wishes, Lucas Wiman