Terry J. Reedy <tjre...@udel.edu> added the comment:

Chris, I see no evidence in the *incomplete* traceback not posted here that 
there is a bug in mock.  Mock calls "hasattr(obj, '__func__') and apparently 
flask, called via werkzeug, answers 'RuntimeError'.  The overt bug is that 
calling werkzeug.local.(type(obj)?).__getattr__ fails by doing something other 
than "return the (computed) attribute value or raise an AttributeError 
exception".
https://docs.python.org/3/reference/datamodel.html#object.__getattr__

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue40805>
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