Function wait_for 

pub async fn wait_for(
    output_rx: Receiver<OutputLine>,
    target: &str,
    pattern: Option<&str>,
    use_regex: bool,
    wait_exit: bool,
    timeout: Duration,
    check_exit: impl FnMut() -> Option<Option<i32>>,
) -> Response

Wait for a condition on a process’s output. Returns a Response indicating match, exit, or timeout.