def test_single(self):
        """
        Test instances from a single singleton class.

        @raise AssertionError: If the test fails.
        """
        dummy_one = self.dummy_class_one()
        dummy_two = self.dummy_class_one()

        self.assertEquals(id(dummy_one), id(dummy_two))

        Test instances from a single singleton class.

        @raise AssertionError: If the test fails.
        
tests/creational_tests/test_singleton.py