def test_pop(self):
s = Stack()
s.push(Slice(1, 2, 3))
assert s.pop().__str__() == '1,2,3 R0'
assert s.__len__() == 0
def test_pop(self):
s = Stack()
s.push(Slice(1, 2, 3))
assert s.pop().__str__() == '1,2,3 R0'
assert s.__len__() == 0
