async def test_send_pres_ack_no_responder(self):
    px_rec = V20PresExRecord()
    self.profile.context.injector.clear_binding(BaseResponder)
    (await self.manager.send_pres_ack(px_rec))
async def test_send_pres_ack_no_responder(self):
    px_rec = V20PresExRecord()
    self.profile.context.injector.clear_binding(BaseResponder)
    (await self.manager.send_pres_ack(px_rec))