tokio 1.22.0

An event-driven, non-blocking I/O platform for writing asynchronous I/O backed applications.
Documentation 
#![warn(rust_2018_idioms)]
#![cfg(all(feature = "full", unix))]

use tokio::process::Command;

#[tokio::test]
async fn arg0() {
    let mut cmd = Command::new("sh");
    cmd.arg0("test_string").arg("-c").arg("echo $0");

    let output = cmd.output().await.unwrap();
    assert_eq!(output.stdout, b"test_string\n");
}