Source code
Revision control
Copy as Markdown
Other Tools
use std::error;
use std::io::{BufRead, BufReader, Write};
use std::process::{Child, Command, Stdio};
use std::result;
#[allow(unused)]
type Error = Box<dyn error::Error + std::marker::Send + std::marker::Sync>;
#[allow(unused)]
pub type Result<T> = result::Result<T, Error>;
fn build_command() -> Command {
let mut cmd;
if let Some(binary) = std::env::var_os("TEST_HELPER") {
cmd = Command::new(binary);
} else {
cmd = Command::new("cargo");
cmd.args(["run", "-q", "--bin", "test"]);
// In normal cases where the host and target are the same this won't matter,
// but tests will fail if you are eg running in a cross container which will
// likely be x86_64 but may be targetting aarch64 or i686, which will result
// in tests failing, or at the least not testing what you think
cmd.args(["--target", current_platform::CURRENT_PLATFORM, "--"]);
}
cmd.env("RUST_BACKTRACE", "1");
cmd
}
#[allow(unused)]
pub fn spawn_child(command: &str, args: &[&str]) {
let mut cmd = build_command();
cmd.arg(command).args(args);
let child = cmd.output().expect("failed to execute child");
println!("Child output:");
std::io::stdout().write_all(&child.stdout).unwrap();
std::io::stdout().write_all(&child.stderr).unwrap();
assert_eq!(child.status.code().expect("No return value"), 0);
}
fn start_child_and_wait_for_threads_helper(command: &str, num: usize) -> Child {
let mut cmd = build_command();
cmd.arg(command).arg(num.to_string());
cmd.stdout(Stdio::piped());
let mut child = cmd.spawn().expect("failed to spawn cargo");
wait_for_threads(&mut child, num);
child
}
#[allow(unused)]
pub fn start_child_and_wait_for_threads(num: usize) -> Child {
start_child_and_wait_for_threads_helper("spawn_and_wait", num)
}
#[allow(unused)]
pub fn start_child_and_wait_for_named_threads(num: usize) -> Child {
start_child_and_wait_for_threads_helper("spawn_name_wait", num)
}
#[allow(unused)]
pub fn start_child_and_wait_for_create_files(num: usize) -> Child {
start_child_and_wait_for_threads_helper("create_files_wait", num)
}
#[allow(unused)]
pub fn wait_for_threads(child: &mut Child, num: usize) {
let mut f = BufReader::new(child.stdout.as_mut().expect("Can't open stdout"));
let mut lines = 0;
while lines < num {
let mut buf = String::new();
match f.read_line(&mut buf) {
Ok(_) => {
if buf == "1\n" {
lines += 1;
}
}
Err(e) => {
std::panic::panic_any(e);
}
}
}
}
#[allow(unused)]
pub fn start_child_and_return(args: &[&str]) -> Child {
let mut cmd = build_command();
cmd.args(args);
cmd.stdout(Stdio::piped())
.spawn()
.expect("failed to execute child")
}