async def test_product_produces_correct_lengths():
"""Check that product produces the right number of results per tuple."""
assert len((await aitertools.alist(
aitertools.product(*[range(7)] * 6)
))) == 7**6
async def test_product_zero_iterables(args, expected):
"""Check that product returns empty tuple when there are no iterables."""
assert (await aitertools.alist(
aitertools.product(*args)
)) == expected