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: write_logging.rs
    path of file: ./repos/fern/tests
    
    the code of the file until where you have to start completion: //! Tests for the raw write logging functionality.
use std::{
    io,
    sync::{
        atomic::{AtomicBool, Ordering},
        Arc,
    },
};

use log::Level::*;

mod support;

use support::manual_log;

#[test]
fn test_raw_write_logging() {
    struct TestWriter {
        buf: Vec<u8>,
        flag: Arc<AtomicBool>,
    }

    impl io::Write for TestWriter {
        fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
            self.buf.write(buf)
        }

        fn flush(&mut self) -> io::Result<()> {
            self.buf.flush()?;

            let expected = b"[INFO] Test information message\n";

            if self.buf == expected {
                self.flag.store(true, Or
    
fn test_raw_write_logging() {
    struct TestWriter {
        buf: Vec<u8>,
        flag: Arc<AtomicBool>,
    }

    impl io::Write for TestWriter {
        fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
            self.buf.write(buf)
        }

        fn flush(&mut self) -> io::Result<()> {
            self.buf.flush()?;

            let expected = b"[INFO] Test information message\n";

            if self.buf == expected {
                self.flag.store(true, Ordering::SeqCst);
            } else {
                eprintln!("{:?} does not match {:?}", self.buf, expected);
            }

            Ok(())
        }
    }

    let flag = Arc::new(AtomicBool::new(false));

    // Create a basic logger configuration
    let (_max_level, logger) = fern::Dispatch::new()
        .format(|out, msg, record| out.finish(format_args!("[{}] {}", record.level(), msg)))
        .level(log::LevelFilter::Info)
        .chain(io::stdout())
        .chain(Box::new(TestWriter {
            buf: Vec::new(),
            flag: flag.clone(),
        }) as Box<dyn io::Write + Send>)
        .into_log();

    let l = &*logger;
    manual_log(l, Info, "Test information message");

    // ensure all File objects are dropped and OS buffers are flushed.
    log::logger().flush();

    assert!(
        flag.load(Ordering::SeqCst),
        "raw Write test failed: did not match buffer"
    );
}