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: message.rs
    path of file: ./repos/reth/crates/net/eth-wire/src/types
    
    the code of the file until where you have to start completion: //! Implements Ethereum wire protocol for versions 66, 67, and 68.
//! Defines structs/enums for messages, request-response pairs, and broadcasts.
//! Handles c
    
    fn request_pair_decode() {
        let raw_pair = &hex!("c5820539c105")[..];

        let expected = RequestPair { request_id: 1337, message: vec![5u8] };

        let got = RequestPair::<Vec<u8>>::decode(&mut &*raw_pair).unwrap();
        assert_eq!(expected.length(), raw_pair.len());
        assert_eq!(expected, got);
    }