def testDistance(self):
failedMessage = "Distance Failed"
self.assertEqual(0, hw.distance(0, 0, 0, 0), failedMessage)
self.assertEqual(6, hw.distance(3, 3, 9, 3), failedMessage)
self.assertEqual(31, hw.distance(30, 2, -1, 8), failedMessage)
self.assertEqual(2, hw.distance(1, 1, 2, 3), failedMessage)
