David Hoyes added the comment:

I came across a different failing test case, which looks a lot like the same 
issue:

```
from unittest import mock

class Foo(object):
    def __call__(self, x):
        return x

m = mock.create_autospec(Foo, instance=True)
m(7)
m.assert_called_once_with(7)
```

In mock 1.0.1 this passes, but in Python 3.5 we get this error:

```
TypeError: missing a required argument: 'x'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "euhpc/tmp/mockbug.py", line 12, in <module>
    m.assert_called_once_with(7)
  File "/usr/lib/python3.5/unittest/mock.py", line 803, in 
assert_called_once_with
    return self.assert_called_with(*args, **kwargs)
  File "/usr/lib/python3.5/unittest/mock.py", line 792, in assert_called_with
    raise AssertionError(_error_message()) from cause
AssertionError: Expected call: mock(7)
Actual call: mock(7)
```

----------
nosy: +David Hoyes

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue27715>
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