Using multiple inheritance for Python mocks

Today, I needed to mock just one function from a class instance.

I used multiple inheritance to achieve that like so:

	class ProductDefinitionMock(object):
	def function_to_mock(self, product_dict):
	return None
	class ProdEngineMock(ProductDefinitionMock, ProdEngine):
	pass
	class MyTests(TestCase):
	def setUp(self):
	self.prod_engine = ProdEngineMock(...)

view raw mock_multi.py hosted with ❤ by GitHub

The ProdEngineMock class inherits everything from the ProdEngine class, except the mocked function.

Nice and elegant!