You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mod.rs
    path of file: ./repos/tikv/tests/integrations/resource_metering/test_suite
    
    the code of the file until where you have to start completion: // Copyright 2021 TiKV Project Authors. Licensed under Apache-2.0.

mod mock_pubsub;
mod mock_receiver_
    
    pub fn start_receiver_at(&mut self, port: u16) {
        assert!(self.receiver_server.is_none());

        let mut receiver_server = MockReceiverServer::new(self.tx.clone());
        receiver_server.start_server(port, self.env.clone());
        self.receiver_server = Some(receiver_server);
    }