//! Under `smarm-trace`, every actor the root-exit sweep reaches is recorded
//! as a `root_sweep` event — the way to *see* unsupervised leftovers. One test
//! per binary: the trace file is process-global.
#![cfg(feature = "smarm-trace")]

use smarm::gen_server::{self, GenServer, GenServerCtx};
use smarm::run;

struct Quiet;
impl GenServer for Quiet {
    type Call = ();
    type Reply = ();
    type Cast = ();
    type Info = ();
    type Timer = ();
    fn init(&mut self, _: &GenServerCtx<Self>) {}
    fn handle_call(&mut self, _: ()) {}
    fn handle_cast(&mut self, _: ()) {}
}

#[test]
fn forgotten_server_shows_up_as_root_sweep() {
    let path = std::env::temp_dir().join(format!("smarm_root_sweep_{}.json", std::process::id()));
    std::env::set_var("SMARM_TRACE_FILE", &path);
    run(|| {
        let srv = gen_server::start(Quiet);
        srv.call(()).unwrap();
        drop(srv); // forgotten: nobody supervises it, nobody holds it
    });
    let trace = std::fs::read_to_string(&path).expect("trace file written");
    let _ = std::fs::remove_file(&path);
    assert!(
        trace.contains("root_sweep stopped"),
        "expected a root_sweep line for the non-trapping leftover; got:\n{trace}"
    );
}