async def test_chunks(range_n, n, expected):
_chunks = []
async for chunk in chunks(aiter(arange(range_n)), n):
_chunks.append(chunk)
assert _chunks == expected
assert [c async for c in chunks(arange(range_n), n)] == expected
async def test_arange():
assert [x async for x in arange(10)] == list(range(10))
assert [x async for x in arange(2, 10)] == list(range(2, 10))
assert [x async for x in arange(0, 100, 10)] == list(range(0, 100, 10))
assert 3 in arange(10)
assert 3 not in arange(2)
assert arange(10).count(1) == 1
assert arange(10).index(3) == 3
async def test_aslice():
assert await alist(aslice(arange(100), 10)) == list(range(10))
assert await alist(aslice(arange(100), 10, 20)) == list(range(10, 20))