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: tokio_runtime.rs
    path of file: ./repos/bastion/src/bastion/tests
    
    the code of the file until where you have to start completion: #[cfg(feature = "tokio-runtime")]
mod tokio_tests {

    use bastion::prelude::*;

    #[tokio::test]
    async fn test_simple_await() {
        tokio::time::sleep(std::time::Duration::from_nanos(1)).await;
    }

    #[tokio::test]
    async fn test_within_bastion() {
        Bastion::init();
        Bastion::start();

        test_within_children().await;
        test_within_message_receive().await;
        test_within_message_receive_blocking().await;
        test_within_message_receive_spawn().await;

        Bastion::stop();
    }

    async fn test_within_children() {
        Bastion::children(|children| {
            children.with_exec(|_| async move {
                tokio::time::sleep(std::time::Duration::from_nanos(1)).await;
                Ok(())
            })
        })
        .expect("Couldn't c
    
    async fn test_within_message_receive() {
        let workers = Bastion::children(|children| {
            children.with_exec(|ctx| async move {
                msg! {
                    ctx.recv().await?,
                    question: &'static str =!> {
                        if question != "marco" {
                            panic!("didn't receive expected message");
                        }
                        tokio::time::sleep(std::time::Duration::from_nanos(1)).await;
                        answer!(ctx, "polo").expect("couldn't send answer");
                    };
                    _: _ => {
                        panic!("didn't receive &str");
                    };
                }
                Ok(())
            })
        })
        .expect("Couldn't create the children group.");

        let answer = workers.elems()[0]
            .ask_anonymously("marco")
            .expect("Couldn't send the message.");

        msg! { answer.await.expect("couldn't receive answer"),
            reply: &'static str => {
                if reply != "polo" {
                    panic!("didn't receive expected message");
                }
            };
            _: _ => { panic!("didn't receive &str"); };
        }
    }