mypyc/test-data/run-async.test

# async test cases (compile and run)

[case testAsync]
import asyncio

async def h() -> int:
    return 1

async def g() -> int:
    await asyncio.sleep(0)
    return await h()

async def f() -> int:
    return await g()

[file asyncio/__init__.pyi]
async def sleep(t: float) -> None: ...

[typing fixtures/typing-full.pyi]

[file driver.py]
from native import f
import asyncio

result = asyncio.run(f())
assert result == 1

[case testAsyncWith]
from testutil import async_val

class async_ctx:
    async def __aenter__(self) -> str:
        await async_val("enter")
        return "test"

    async def __aexit__(self, x, y, z) -> None:
        await async_val("exit")


async def async_with() -> str:
    async with async_ctx() as x:
        return await async_val("body")


[file driver.py]
from native import async_with
from testutil import run_generator

yields, val = run_generator(async_with(), [None, 'x', None])
assert yields == ('enter', 'body', 'exit'), yields
assert val == 'x', val


[case testAsyncReturn]
from testutil import async_val

async def async_return() -> str:
    try:
        return 'test'
    finally:
        await async_val('foo')

[file driver.py]
from native import async_return
from testutil import run_generator

yields, val = run_generator(async_return())
assert yields == ('foo',)
assert val == 'test', val


[case testAsyncFor]
from typing import AsyncIterable, List, Set, Dict

async def async_iter(xs: AsyncIterable[int]) -> List[int]:
    ys = []
    async for x in xs:
        ys.append(x)
    return ys

async def async_comp(xs: AsyncIterable[int]) -> List[int]:
    ys = [x async for x in xs]
    return ys

async def async_comp_set(xs: AsyncIterable[int]) -> Set[int]:
    return {x async for x in xs}

async def async_comp_dict(xs: AsyncIterable[int]) -> Dict[int, str]:
    return {x: str(x) async for x in xs}

[typing fixtures/typing-full.pyi]

[file driver.py]
from native import async_iter, async_comp, async_comp_set, async_comp_dict
from testutil import run_generator, async_val
from typing import AsyncIterable, List

# defined here since we couldn't do it inside the test yet...
async def foo() -> AsyncIterable[int]:
    for x in range(3):
        await async_val(x)
        yield x

yields, val = run_generator(async_iter(foo()))
assert val == [0,1,2], val
assert yields == (0,1,2), yields

yields, val = run_generator(async_comp(foo()))
assert val == [0,1,2], val
assert yields == (0,1,2), yields

yields, val = run_generator(async_comp_set(foo()))
assert val == {0,1,2}, val
assert yields == (0,1,2), yields

yields, val = run_generator(async_comp_dict(foo()))
assert val == {0: '0',1: '1', 2: '2'}, val
assert yields == (0,1,2), yields

[case testAsyncFor2]
from typing import AsyncIterable, List

async def async_iter(xs: AsyncIterable[int]) -> List[int]:
    ys = []
    async for x in xs:
        ys.append(x)
    return ys

[typing fixtures/typing-full.pyi]

[file driver.py]
from native import async_iter
from testutil import run_generator, async_val
from typing import AsyncIterable, List

# defined here since we couldn't do it inside the test yet...
async def foo() -> AsyncIterable[int]:
    for x in range(3):
        await async_val(x)
        yield x
    raise Exception('lol no')

yields, val = run_generator(async_iter(foo()))
assert yields == (0,1,2), yields
assert val == 'lol no', val