Using mock patch to mock an instance method

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To add onto Kit’s answer, specifying a 3rd argument to patch.object() allows the mocked object/method to be specified. Otherwise, a default MagicMock object is used.

    def fake_bar(self):
        print "Do something I want!"
        return True

    @patch.object(my_app.models.FooClass, 'bar', fake_bar)
    def test_enter_promotion(self):
        self.client.get(reverse(view))
        # Do something I want!

Note that, if you specify the mocking object, then the default MagicMock() is no longer passed into the patched object — e.g. no longer:

def test_enter_promotion(self, mock_method):

but instead:

def test_enter_promotion(self):

https://docs.python.org/3/library/unittest.mock.html#patch-object

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