async def test_send_pres_ack(self):
    px_rec = V20PresExRecord()
    responder = MockResponder()
    self.profile.context.injector.bind_instance(BaseResponder, responder)
    (await self.manager.send_pres_ack(px_rec))
    messages = responder.messages
    assert (len(messages) == 1)
async def test_send_pres_ack(self):
    px_rec = V20PresExRecord()
    responder = MockResponder()
    self.profile.context.injector.bind_instance(BaseResponder, responder)
    (await self.manager.send_pres_ack(px_rec))
    messages = responder.messages
    assert (len(messages) == 1)