Rémi Lapeyre <remi.lape...@henki.fr> added the comment:

Is there a problem with:

from unittest import mock

class SomeClass:
    def do_something(self, x):
        pass

def some_function(x):
    obj = SomeClass()
    y = obj.do_something(x)
    return y

def do_something_side_effect(self, x):
    print(self)
    return x

def test_some_function():
    with mock.patch.object(SomeClass, "do_something", do_something_side_effect):
        assert some_function(1)

?

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nosy: +remi.lapeyre

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue35577>
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