def test_reduce_nil():
# pylint: disable=missing-docstring
initial = 1232
slst = SList()
res = slst.reduce(operator.add, initial)
exp = initial
assert res == exp
def test_reduce_sum_non_empty():
# pylint: disable=missing-docstring
slst = SList([1, 2, 3, 4, 5, 6])
exp = 22
res = slst.reduce(operator.add, 1)
assert res == exp
def test_reduce_sum_empty():
# pylint: disable=missing-docstring
slst = SList()
exp = 0
res = slst.reduce(operator.add, 0)
assert res == exp
def test_reduce_cons():
# pylint: disable=missing-docstring
slst = SList([1, 2, 3, 4])
res = slst.reduce(operator.add)
exp = 10
assert res == exp
