def test_mapi_empty():
# pylint: disable=missing-docstring
slst = SList()
exp = SList()
res = slst.mapi(lambda i, val: (i, val))
assert res == exp
def test_mapi_id():
# pylint: disable=missing-docstring
slst = SList([1, 2, 3])
exp = SList([1, 2, 3])
res = slst.mapi(lambda i, val: val)
assert res == exp
def test_mapi_non_empty():
# pylint: disable=missing-docstring
data = SList([1, 3, 5, 8, 12])
res = data.mapi(operator.add)
exp = SList([1, 4, 7, 11, 16])
assert res == exp
