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: verify_accounts_hash_in_background.rs
    path of file: ./repos/solana/accounts-db/src
    
    the code of the file until where you have to start completion: //! at startup, verify accounts hash in the background
use {
    crate::waitable_condvar::WaitableCondvar,
    std::{
        sync::{
            atomic::{AtomicBool, Ordering},
            Arc, Mutex,
        },
        thread::JoinHandle,
        time::Duration,
    },
};

#[derive(Debug)]
pub struct VerifyAccountsHashInBackground {
    /// true when verification has completed or never had 
    
    fn test_long_running() {
        solana_logger::setup();
        let verify = Arc::new(VerifyAccountsHashInBackground::default());
        let finish = Arc::new(AtomicBool::default());
        let finish_ = finish.clone();
        start_thread_and_return(&verify, true, move || {
            // busy wait until atomic is set
            while !finish_.load(Ordering::Relaxed) {}
        });
        assert!(!verify.check_complete());
        finish.store(true, Ordering::Relaxed);
        verify.wait_for_complete();
        assert!(verify.check_complete());
    }