File: py3_test_core.py

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# flake8: noqa
import asyncio
from time import time
from distributed.utils_test import inc  # noqa

from streamz import Stream


def test_await_syntax():  # noqa
    L = []

    async def write(x):
        await asyncio.sleep(0.1)
        L.append(x)

    async def f():
        source = Stream(asynchronous=True)
        source.map(inc).buffer(3).sink(write)

        start = time()
        for x in range(6):
            await source.emit(x)
        stop = time()

        assert 0.2 < stop - start < 0.4
        assert 2 <= len(L) <= 4

    asyncio.run(f())