Mocking only a single method on an object
I think what you are looking for is mock.patch.object
with mock.patch.object(MyClassUnderTest, "submethod") as submethod_mocked: submethod_mocked.return_value = 13 MyClassUnderTest().main_method() submethod_mocked.assert_called_once_with(user_id, 100, self.context, self.account_type)Here is small description
patch.object(target, attribute, new=DEFAULT, spec=None, create=False, spec_set=None, autospec=None, new_callable=None, **kwargs)patch the named member (attribute) on an object (target) with a mock object.