thirdshift 0.10.0

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//! Run signal-sensitive tests in isolated processes so interruption and
//! fixture environment changes cannot leak into another test.

use std::process::Command;

use crate::interrupt;

/// Exercise the fully qualified test once per recorded signal, installing
/// the handler only in the subprocess selected for that test.
pub(crate) fn with_recorded_signal(test_name: &str, exercise: impl FnOnce(libc::c_int)) {
    const TEST: &str = "THIRDSHIFT_TEST_SIGNAL_NAME";
    const SIGNAL: &str = "THIRDSHIFT_TEST_SIGNAL";
    if std::env::var(TEST).as_deref() == Ok(test_name) {
        interrupt::install().unwrap();
        exercise(std::env::var(SIGNAL).unwrap().parse().unwrap());
        return;
    }
    for signal in [libc::SIGINT, libc::SIGTERM, libc::SIGHUP] {
        let result = Command::new(std::env::current_exe().unwrap())
            .args(["--exact", test_name, "--nocapture"])
            .env(TEST, test_name)
            .env(SIGNAL, signal.to_string())
            .output()
            .unwrap();
        assert!(
            result.status.success(),
            "{test_name}, signal {signal}: {result:?}"
        );
    }
}