add panic hook to test server

tests/util/server/src/test_server.rs

@@ -1,5 +1,18 @@
 // Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
 
 fn main() {
+  setup_panic_hook();
   test_server::servers::run_all_servers();
 }
+
+fn setup_panic_hook() {
+  // Tokio does not exit the process when a task panics, so we define a custom
+  // panic hook to implement this behaviour.
+  let orig_hook = std::panic::take_hook();
+  std::panic::set_hook(Box::new(move |panic_info| {
+    eprintln!("\n============================================================");
+    eprintln!("Test server panicked!\n");
+    orig_hook(panic_info);
+    std::process::exit(1);
+  }));
+}