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# Copyright 2022 Amethyst Reese
# Licensed under the MIT license
from typing import AsyncIterable
from unittest import TestCase
import aioitertools.more_itertools as mit
from .helpers import async_test
async def _gen() -> AsyncIterable[int]:
for i in range(5):
yield i
async def _empty() -> AsyncIterable[int]:
return
yield 0
class MoreItertoolsTest(TestCase):
@async_test
async def test_take(self) -> None:
self.assertEqual(await mit.take(2, _gen()), [0, 1])
self.assertEqual(await mit.take(2, range(5)), [0, 1])
@async_test
async def test_take_zero(self) -> None:
self.assertEqual(await mit.take(0, _gen()), [])
@async_test
async def test_take_negative(self) -> None:
with self.assertRaises(ValueError):
await mit.take(-1, _gen())
@async_test
async def test_take_more_than_iterable(self) -> None:
self.assertEqual(await mit.take(10, _gen()), list(range(5)))
@async_test
async def test_take_empty(self) -> None:
it = _gen()
self.assertEqual(len(await mit.take(5, it)), 5)
self.assertEqual(await mit.take(1, it), [])
self.assertEqual(await mit.take(1, _empty()), [])
@async_test
async def test_chunked(self) -> None:
self.assertEqual(
[chunk async for chunk in mit.chunked(_gen(), 2)], [[0, 1], [2, 3], [4]]
)
self.assertEqual(
[chunk async for chunk in mit.chunked(range(5), 2)], [[0, 1], [2, 3], [4]]
)
@async_test
async def test_chunked_empty(self) -> None:
self.assertEqual([], [chunk async for chunk in mit.chunked(_empty(), 2)])
@async_test
async def test_before_and_after_split(self) -> None:
it = _gen()
before, after = await mit.before_and_after(lambda i: i <= 2, it)
self.assertEqual([elm async for elm in before], [0, 1, 2])
self.assertEqual([elm async for elm in after], [3, 4])
@async_test
async def test_before_and_after_before_only(self) -> None:
it = _gen()
before, after = await mit.before_and_after(lambda i: True, it)
self.assertEqual([elm async for elm in before], [0, 1, 2, 3, 4])
self.assertEqual([elm async for elm in after], [])
@async_test
async def test_before_and_after_after_only(self) -> None:
it = _gen()
before, after = await mit.before_and_after(lambda i: False, it)
self.assertEqual([elm async for elm in before], [])
self.assertEqual([elm async for elm in after], [0, 1, 2, 3, 4])
@async_test
async def test_before_and_after_async_predicate(self) -> None:
async def predicate(elm: int) -> bool:
return elm <= 2
it = _gen()
before, after = await mit.before_and_after(predicate, it)
self.assertEqual([elm async for elm in before], [0, 1, 2])
self.assertEqual([elm async for elm in after], [3, 4])
@async_test
async def test_before_and_after_empty(self) -> None:
it = _empty()
before, after = await mit.before_and_after(lambda i: True, it)
self.assertEqual([elm async for elm in before], [])
self.assertEqual([elm async for elm in after], [])
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