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import txaio

from util import run_once


def test_cancel(framework):
    cancels = []

    def it_died(f):
        cancels.append(f)

    f = txaio.create_future(canceller=it_died)
    # both Future and Deferred have .cancel() methods .. but seemed
    # more "symmetric"/expected to make a method? But could just stick
    # with "f.cancel()" here ...
    txaio.cancel(f)

    # at least for Twisted, we have to "handle" the "CancelledError"
    # -- in practice, dropping a future on the floor with no
    # error-handler is A Bad Thing anyway
    txaio.add_callbacks(f, None, lambda _: None)

    run_once()
    run_once()

    assert cancels == [f]