def test_tail_several():
# pylint: disable=missing-docstring
slst = SList([1, 2, 3])
exp = SList([2, 3])
res = slst.tail()
assert res == exp
def test_tail_one():
# pylint: disable=missing-docstring
slst = SList([1])
exp = SList()
res = slst.tail()
assert res == exp