[issue38505] Mock.call_args and Mock.call_args_list

[Caris Moses]

New submission from Caris Moses <caris.moses at gmail.com>:

When I use some_mock.attach_mock(...) and make calls, the resulting some_mock.call_args is None while the some_mock.mock_calls list is not empty.

The code below shows this in Python 3.7.5:

from unittest import TestCase
from unittest.mock import patch, Mock

def foo(value):
    return value

class MyObjectTest(TestCase):

    @patch(f'{__name__}.foo')
    def test_do_something(self, mock_foo):
        manager = Mock()
        manager.attach_mock(mock_foo, 'foo_func')
        foo(3)
        print(manager.mock_calls)
        print(manager.call_args)
        print(manager.call_args_list)

if __name__ == "__main__":
    unittest.main()

The print statements return:
[call.foo_func(3)]
None
[]

While the code below (without attach_mock) works fine:

from unittest import TestCase
from unittest.mock import patch, Mock

def foo(value):
    return value

class MyObjectTest(TestCase):

    @patch(f'{__name__}.foo')
    def test_do_something(self, mock_foo):
        foo(3)
        print(mock_foo.mock_calls)
        print(mock_foo.call_args)
        print(mock_foo.call_args_list)

if __name__ == "__main__":
    unittest.main()

Print statements correctly return:
[call(3)]
call(3)
[call(3)]

I also tested in Python 3.8.0 and got the same result.

----------
messages: 354841
nosy: Caris Moses
priority: normal
severity: normal
status: open
title: Mock.call_args and Mock.call_args_list

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38505>
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