def METHOD_NAME(self):
    """
    Adding a filesystem file reader to a reactor will make sure it is
    polled.
    """
    reactor = self.buildReactor()
    class DataProtocol(Protocol):
        data = b""
        def dataReceived(self, data):
            self.data += data
            # It'd be better to stop reactor on connectionLost, but that
            # fails on FreeBSD, probably due to
            # http://bugs.python.org/issue9591:
            if self.data == b"hello!":
                reactor.stop()
    path = self.mktemp()
    with open(path, "wb") as f:
        f.write(b"hello!")
    with open(path, "rb") as f:
        # Read bytes from a file, deliver them to a protocol instance:
        protocol = DataProtocol()
        StandardIO(
            protocol,
            stdin=f.fileno(),
            stdout=self.extraFile.fileno(),
            reactor=reactor,
        )
        self.runReactor(reactor)
    self.assertEqual(protocol.data, b"hello!")