pub fn test_logger() {

    if cfg!(not(feature = "merc_miri")) {

        // Ignore double initialisations in tests since tests are ran in parallel.

        let _ = env_logger::builder().is_test(true).try_init();

    }

}

pub fn test_threads<C, F, G>(num_threads: usize, init_function: G, test_function: F)

where

    C: Send + 'static,

    F: Fn(&mut C) + Copy + Send + Sync + 'static,

    G: Fn() -> C,

    test_logger();

    let mut threads = vec![];

    for _ in 0..num_threads {

        let mut init = init_function();

        threads.push(std::thread::spawn(move || {

            test_function(&mut init);

        }));

    for thread in threads {

        let _ = thread.join();

    }

}