process_change_of_runtime.rs

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#![cfg(feature = "process")]

#![warn(rust_2018_idioms)]

// This tests test the behavior of `process::Command::spawn` when it is used

// outside runtime, and when `process::Child::wait ` is used in a different

// runtime from which `process::Command::spawn` is used.

#![cfg(all(unix, not(target_os = "freebsd")))]

use std::process::Stdio;

use tokio::{process::Command, runtime::Runtime};

#[test]

fn process_spawned_and_wait_in_different_runtime() {

    let mut child = Runtime::new().unwrap().block_on(async {

        Command::new("true")

            .stdin(Stdio::piped())

            .stdout(Stdio::null())

            .spawn()

            .unwrap()

});

    Runtime::new().unwrap().block_on(async {

        let _ = child.wait().await.unwrap();

});

#[test]

#[should_panic(

    expected = "there is no reactor running, must be called from the context of a Tokio 1.x runtime"

)]

fn process_spawned_outside_runtime() {

    let _ = Command::new("true")

        .stdin(Stdio::piped())

        .stdout(Stdio::null())

        .spawn();