def test_equals_2(self): self.assertEqual(greatest_distance([9, 7, 1, 2, 3, 7, 0, -1, -2]), 4)
def test_equals_4(self): self.assertEqual(greatest_distance([1, 2, 3, 4]), 0)
def test_equals(self): self.assertEqual(greatest_distance([0, 2, 1, 2, 4, 1]), 3)
def test_equals_3(self): self.assertEqual(greatest_distance([0, 7, 0, 2, 3, 7, 0, -1, -2]), 6)