def test_map_reduce_nil():
# pylint: disable=missing-docstring
initial = 1232
slst = SList()
res = slst.map_reduce(fun.incr, operator.add, initial)
exp = initial
assert res == exp
def test_map_reduce_non_empty():
# pylint: disable=missing-docstring
slst = SList([1, 2, 3, 4])
res = slst.map_reduce(fun.incr, operator.add, 0)
exp = slst.map(fun.incr).reduce(operator.add)
assert res == exp
