def test_patch_has_no_side_effects(self):
a = [1, 2, 3]
copy_of_a = deepcopy(a)
b = [3, 2, 1]
d = diff(a, b)
self.assertEqual(patch_sequence(a, d), b)
self.assertEqual(a, copy_of_a)
def test_another_different_object_case(self):
a = [0, 0, 0]
b = [0, 1, 0, 1, 0]
c = [2, 2, 2]
d = diff(a, b)
self.assertEqual(patch_sequence(c, d), [2, 1, 2, 1, 2])
def test_can_apply_patch_to_different_object(self):
a = [0, 1, 2, 3]
b = [1, 2, 3, 4]
c = [0, 2, 2, 2]
d = diff(a, b)
self.assertEqual(patch_sequence(c, d), [2, 2, 2, 4])