def test_from_iterables_with_length_hint():
i = ChIter.from_iterables(range(5), range(5, 10))
assert length_hint(i) == length_hint(range(10))
def test_from_iterables():
i = ChIter.from_iterables(range(5), range(5, 10))
assert isinstance(i, ChIter)
assert list(i) == list(range(10))
