def test_call(self):
        """
        Test calling a Null object.

        @raise AssertionError: If the test fails.
        """
        self.assertEquals(self.null, self.null())
        self.assertEquals(self.null, self.null('value'))
        self.assertEquals(self.null, self.null('value', param='value'))

        Test calling a Null object.

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