def test_rpcfuture_cancellation():
rpc_fut = RPCFuture()
fut = Future()
rpc_fut.attach(fut)
rpc_fut.cancel()
assert fut.cancelled()
def test_propagates_only_once_1():
rpc_fut = RPCFuture()
fut = Future()
rpc_fut.attach(fut)
rpc_fut.cancel()
rpc_fut.set_result(42)
with pytest.raises(CancelledError):
assert fut.result(timeout=1)