def test_equals(self):
     self.assertEqual(getSlope([1, 1], [2, 2]), 1)
 def test_equals_2(self):
     self.assertEqual(getSlope([11, 1], [1, 11]), -1)
 def test_none_2(self):
     self.assertIsNone(getSlope([1, 1], [1, 1]))