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: bytes.rs
    path of file: ./repos/firecracker/src/vmm/src/dumbo/pdu
    
    the code of the file until where you have to start completion: // Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0

//! Defines traits which allow byte slices to be interpreted as sequences of bytes that stand for
//! different values packed together using network byte ordering (such as network packets)
    
    fn test_network_bytes() {
        let mut buf = [0u8; 1000];

        {
            let mut a = buf.as_mut();

            a.htons_unchecked(1, 123);
            a.htonl_unchecked(100, 1234);

            assert_eq!(a.ntohs_unchecked(1), 123);
            assert_eq!(a.ntohl_unchecked(100), 1234);

            a.shrink_unchecked(500);

            assert_eq!(a.len(), 500);
            assert_eq!(a.ntohs_unchecked(1), 123);
            assert_eq!(a.ntohl_unchecked(100), 1234);
        }

        {
            let mut b = buf.as_ref();
            b.shrink_unchecked(500);

            assert_eq!(b.len(), 500);
            assert_eq!(b.ntohs_unchecked(1), 123);
            assert_eq!(b.ntohl_unchecked(100), 1234);
        }
    }