New submission from James Marchant <marchant...@gmail.com>:

When using `create_autospec()` to create a mock object, it doesn't respect 
values passed through in the style described for passing mock configurations in 
the Mock constructor 
(https://docs.python.org/3.8/library/unittest.mock.html#unittest.mock.Mock.configure_mock).
 Instead, they seem to get discarded somewhere here 
(https://github.com/python/cpython/blob/77bab59c8a1f04922bb975cc4f11e5323d1d379d/Lib/unittest/mock.py#L2693-L2741).

Here's a simple test case:
```
from unittest.mock import create_autospec

class Test:
    def test_method(self):
        pass

autospec_mock = create_autospec(Test, instance=True, 
**{"test_method.side_effect": ValueError})

# Should throw a ValueError exception
autospec_mock.test_method()

# Assign manually
autospec_mock.test_method.side_effect = ValueError
# Throws as expected
autospec_mock.test_method()
```

----------
components: Tests
messages: 412898
nosy: marchant.jm
priority: normal
severity: normal
status: open
title: create_autospec() doesn't respect configure_mock style kwargs
type: behavior
versions: Python 3.10, Python 3.8, Python 3.9

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46690>
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