def test_slice_signature(self, space):
ar = SingleDimArray(10)
v1 = ar.descr_getitem(space, space.wrap(slice(1, 5, 1)))
v2 = ar.descr_getitem(space, space.wrap(slice(4, 6, 1)))
assert v1.signature is v2.signature
v3 = ar.descr_add(space, v1)
v4 = ar.descr_add(space, v2)
assert v3.signature is v4.signature
