From fda636ac32ce9933785bd2aec9ed4f60ba89a996 Mon Sep 17 00:00:00 2001
From: RyuJongJin <266630912+RyuJongJin@users.noreply.github.com>
Date: Tue, 20 Oct 2026 23:51:39 +0900
Subject: [PATCH] =?UTF-8?q?WIP=20=EC=8B=9C=ED=97=98=20=ED=9D=94=EB=93=A4?=
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 test/support/fake_dns.dart | 29 +++++++++++++++++++++++------
 1 file changed, 23 insertions(+), 6 deletions(-)

diff --git a/test/support/fake_dns.dart b/test/support/fake_dns.dart
index 83ef0ee..adfc983 100644
--- a/test/support/fake_dns.dart
+++ b/test/support/fake_dns.dart
@@ -20,6 +20,24 @@ class FakeDns {
 
   int get port => _udp.port;
 
+  /// 그 번호로 UDP 를 연다 (못 열면 null). 전체 시험 (10/20) 에서 막힌 포트 (10013) 의 오류가 try 밖으로 (잡히지 않은 비동기 오류로)
+  /// 나와 시험이 실패한 적이 있어, 열기 하나를 따로 영역 (zone) 에서 돌려 어느 쪽으로 오든 "못 열었음" 으로 받는다
+  Future<RawDatagramSocket?> _tryUdp(int port) {
+    final done = Completer<RawDatagramSocket?>();
+    runZonedGuarded(() async {
+      final s = await RawDatagramSocket.bind(InternetAddress.loopbackIPv4, port);
+      if (done.isCompleted) {
+        s.close();
+      } else {
+        done.complete(s);
+      }
+    }, (e, _) {
+      events.add('udp bind $port failed: ${e is SocketException ? '${e.osError?.errorCode} ${e.message}' : e}');
+      if (!done.isCompleted) done.complete(null);
+    });
+    return done.future;
+  }
+
   Future<void> start() async {
     if (!truncateUdp) {
       _udp = await RawDatagramSocket.bind(InternetAddress.loopbackIPv4, 0);
@@ -29,16 +47,15 @@ class FakeDns {
       // 그 번호의 UDP 가 막혀 있거나 (10013) 쓰는 중이면 다른 번호로 다시
       for (var i = 0;; i++) {
         final tcp = await ServerSocket.bind(InternetAddress.loopbackIPv4, 0);
-        try {
-          _udp = await RawDatagramSocket.bind(InternetAddress.loopbackIPv4, tcp.port);
+        final udp = await _tryUdp(tcp.port);
+        if (udp != null) {
+          _udp = udp;
           _tcp = tcp;
           events.add('bound tcp+udp ${tcp.port} (try $i)');
           break;
-        } on SocketException catch (e) {
-          events.add('udp bind ${tcp.port} failed: ${e.osError?.errorCode} ${e.message}');
-          await tcp.close();
-          if (i > 50) rethrow;
         }
+        await tcp.close();
+        if (i > 50) throw StateError('UDP 포트를 열지 못함: $events');
       }
     }
     _udp.listen((e) {