[pypy-issue] [issue1187] call to isinstance(...) in __sub__(self, other) in lib_pypy/datetime.py draws error in test

[Ian Delaney]

Ian Delaney <della5 at iinet.com.au> added the comment:

could the cause be instead in mock??

  File "/usr/lib64/pypy1.9/site-packages/mock.py", line 983, in __call__
    return _mock_self._mock_call(*args, **kwargs)
  File "/usr/lib64/pypy1.9/site-packages/mock.py", line 1038, in _mock_call

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