//! Regression: SSE connection-pool leak via missing `EventSource.close()`.
//!
//! Every HTML template that opens `new EventSource('/events')` must
//! also close it on `pagehide`. Without the close, Chrome keeps the
//! socket in a "draining" state after navigation; after ~6 rapid
//! back-and-forth navigations all 6 per-origin pool slots are draining
//! and new requests stall with `blocked` timings of 15-30 seconds
//! (confirmed by HAR capture on 2026-04-20).

use std::fs;
use std::path::Path;

#[test]
fn every_event_source_template_closes_it_on_pagehide() {
    let template_dir = Path::new(env!("CARGO_MANIFEST_DIR")).join("templates");
    let entries = fs::read_dir(&template_dir).expect("templates directory readable");

    let mut checked = 0;
    let mut missing: Vec<String> = Vec::new();

    for entry in entries {
        let path = entry.unwrap().path();
        if path.extension().and_then(|s| s.to_str()) != Some("html") {
            continue;
        }
        let content = fs::read_to_string(&path).unwrap();
        if !content.contains("new EventSource('/events')") {
            continue;
        }
        checked += 1;
        let has_pagehide = content.contains("pagehide");
        let has_close = content.contains(".close()");
        if !(has_pagehide && has_close) {
            missing.push(path.file_name().unwrap().to_string_lossy().into_owned());
        }
    }

    assert!(
        checked >= 1,
        "test itself is stale: no template contains EventSource('/events')",
    );
    assert!(
        missing.is_empty(),
        "templates open EventSource but lack `pagehide` + `.close()` cleanup: {missing:?} \
         — this leaks Chrome socket-pool slots and stalls navigation after ~6 cycles",
    );
}