로그아웃 즉시 처리 · 푸시 토큰 정리 순서

app/test/backend_repository_test.dart

@@ -1570,6 +1570,58 @@ void main() {
       );
     });
 
+    test('정리가 끝나기 전 로그인하면 구독은 정리 완료 뒤에 호출된다', () async {
+      final db = await _seed();
+      final transport = _FakeTransport()..gate = Completer<void>();
+      final push = PushMessaging(backend: _backend(db), transport: transport);
+      final cleanup = push.clearOnSignOut(); // 기다리지 않는다
+      final sync = push.syncTopics(PushTopic.defaults);
+      await Future<void>.delayed(const Duration(milliseconds: 20));
+      expect(transport.subscribed, isEmpty);
+      transport.gate!.complete();
+      await Future.wait([cleanup, sync]);
+      expect(transport.subscribed, isNotEmpty);
+      // 정리의 해지(구분 수만큼)가 모두 끝난 뒤에야 첫 구독이 나간다.
+      expect(
+        transport.log.indexOf('sub'),
+        greaterThanOrEqualTo(PushTopic.values.length),
+      );
+    });
+
+    test('정리가 실패해도 로그인 구독은 진행된다', () async {
+      final db = await _seed();
+      final transport = _FakeTransport()..failUnsubscribe = true;
+      final push = PushMessaging(backend: _backend(db), transport: transport);
+      await push.clearOnSignOut(); // 던지지 않는다
+      transport.failUnsubscribe = false;
+      await push.syncTopics(PushTopic.defaults);
+      expect(transport.subscribed, isNotEmpty);
+    });
+
+    test('정리가 멈추면 상한 뒤 구독을 진행한다', () async {
+      final db = await _seed();
+      final transport = _FakeTransport()..gate = Completer<void>();
+      final push = PushMessaging(backend: _backend(db), transport: transport);
+      final old = PushMessaging.pendingClearTimeout;
+      PushMessaging.pendingClearTimeout = const Duration(milliseconds: 50);
+      addTearDown(() => PushMessaging.pendingClearTimeout = old);
+      unawaited(push.clearOnSignOut());
+      await Future<void>.delayed(const Duration(milliseconds: 10));
+      transport.gate = null; // 이후 호출은 막지 않는다
+      await push.syncTopics(PushTopic.defaults);
+      expect(transport.subscribed, isNotEmpty);
+    });
+
+    test('토큰 제거가 멈춰도 상한 뒤 clearOnSignOut 이 끝난다', () async {
+      final db = await _seed();
+      final transport = _FakeTransport()..tokenGate = Completer<String?>();
+      final push = PushMessaging(backend: _backend(db), transport: transport);
+      final old = PushMessaging.tokenRemoveTimeout;
+      PushMessaging.tokenRemoveTimeout = const Duration(milliseconds: 50);
+      addTearDown(() => PushMessaging.tokenRemoveTimeout = old);
+      await push.clearOnSignOut().timeout(const Duration(seconds: 2));
+    });
+
     test('팬덤 소속이 없으면 아무 토픽도 건드리지 않는다', () async {
       final db = await _seed();
       await db.doc('users/$_uid').set({'uid': _uid, 'fandomId': ''});
@@ -1605,6 +1657,10 @@ void main() {
 final class _FakeTransport implements PushTransport {
   final List<String> subscribed = [];
   final List<String> unsubscribed = [];
+  final List<String> log = [];
+  Completer<void>? gate;
+  bool failUnsubscribe = false;
+  Completer<String?>? tokenGate;
 
   @override
   Future<AuthorizationStatus> requestPermission() async =>
@@ -1615,17 +1671,24 @@ final class _FakeTransport implements PushTransport {
       AuthorizationStatus.authorized;
 
   @override
-  Future<String?> getToken() async => 'fake-token';
+  Future<String?> getToken() async => tokenGate?.future ?? 'fake-token';
 
   @override
   Stream<String> get onTokenRefresh => const Stream<String>.empty();
 
   @override
-  Future<void> subscribeToTopic(String topic) async => subscribed.add(topic);
+  Future<void> subscribeToTopic(String topic) async {
+    log.add('sub');
+    subscribed.add(topic);
+  }
 
   @override
-  Future<void> unsubscribeFromTopic(String topic) async =>
-      unsubscribed.add(topic);
+  Future<void> unsubscribeFromTopic(String topic) async {
+    await gate?.future;
+    if (failUnsubscribe) throw Exception('offline');
+    log.add('unsub');
+    unsubscribed.add(topic);
+  }
 
   @override
   Future<RemoteMessage?> getInitialMessage() async => null;