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from unittest.mock import Mock
class _ContextMock(Mock):
"""Dummy class implementing __enter__ and __exit__
as the :keyword:`with` statement requires these to be implemented
in the class, not just the instance."""
def __enter__(self):
return self
def __exit__(self, *exc_info):
pass
def ContextMock(*args, **kwargs):
"""Mock that mocks :keyword:`with` statement contexts."""
obj = _ContextMock(*args, **kwargs)
obj.attach_mock(_ContextMock(), '__enter__')
obj.attach_mock(_ContextMock(), '__exit__')
obj.__enter__.return_value = obj
# if __exit__ return a value the exception is ignored,
# so it must return None here.
obj.__exit__.return_value = None
return obj
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