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: busy.rs
    path of file: ./repos/rusqlite/src
    
    the code of the file until where you have to start completion: //! Busy handler (when the database is locked)
use std::mem;
use std::os::raw::{c_int, c_void};
use std::panic::catch_unwind;
use std::ptr;
use std::time::Duration;

use crate::ffi;
use crate::{Connection, InnerConnection, Result};

impl Connection {
    /// Set a busy handler that sleeps for a specified amount of time when a
    /// table is locked. The handler will sleep multiple times until at
    /// least "ms" milliseconds of sleeping have accumulated.
    ///
    /// Callin
    
    fn test_default_busy() -> Result<()> {
        let temp_dir = tempfile::tempdir().unwrap();
        let path = temp_dir.path().join("test.db3");

        let mut db1 = Connection::open(&path)?;
        let tx1 = db1.transaction_with_behavior(TransactionBehavior::Exclusive)?;
        let db2 = Connection::open(&path)?;
        let r: Result<()> = db2.query_row("PRAGMA schema_version", [], |_| unreachable!());
        assert_eq!(
            r.unwrap_err().sqlite_error_code(),
            Some(ErrorCode::DatabaseBusy)
        );
        tx1.rollback()
    }