def test_update(self):
        """
        Test the update method.

        @raise AssertionError: If the test fails.
        """
        state = {'foo': 'test1', 'bar': 'test2'}
        self.observer.update(**state)

        self.assertEquals(state, self.observer.updated_state)

        Test the update method.

        @raise AssertionError: If the test fails.
        
tests/behavioral_tests/test_observer.py