def test_instance_variables(self):
        squareWithNoCoordinatesGiven = Square(5)
        self.assertEqual(squareWithNoCoordinatesGiven.x(), 0)
        self.assertEqual(squareWithNoCoordinatesGiven.y(), 0)

        squareWithCoordinatesGiven = Square(5, {'x': 3, 'y': 4})
        self.assertEqual(squareWithCoordinatesGiven.x(), 3)
        self.assertEqual(squareWithCoordinatesGiven.y(), 4)
 def test_x(self):
     square = Square(4, {'x': 1, 'y': 2})
     self.assertEqual(square.x(), 1)