# This will print nothing because the set contains tasks, not f1 and f2.

import asyncio

async def hello_coroutine():
    """Corouting function (returns coroutine object)."""
    return 'hello'

def hello_future():
    """Function with deferred result (returns a Future/Task)."""
    return asyncio.get_event_loop().create_task(hello_coroutine())

async def test():
    # Fan-out.
    awaitable1 = hello_future();
    awaitable2 = hello_coroutine();  # add ensure_future() to fix.

    # Fan-in.
    done, pending = await asyncio.wait(
        {awaitable1, awaitable2},
        return_when=asyncio.ALL_COMPLETED,
    )

    # Make sure everything is as expected.
    assert len(pending) == 0
    assert len(done) == 2

    # Recover results using membership test.
    assert awaitable1 in done
    try:
        assert awaitable2 in done
    except AssertionError:
        print('FAIL: coroutine object not in `done`.')

    # Recover results using await.
    assert (await  awaitable1) == 'hello'
    try:
        assert (await  awaitable2) == 'hello'
    except AssertionError:
        print('FAIL: await on coroutine object did not provide return value.')

    # NOTE: if we launch 2 coroutines here, the result is worse because we'll
    # get a pair of futures and we don't know which one matches which
    # coroutine.

asyncio.get_event_loop().run_until_complete(test())