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test/typing_dispose_race_test.dart

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+import 'package:flutter_test/flutter_test.dart';
+import 'package:supabase_flutter/supabase_flutter.dart';
+import 'package:tasq/providers/typing_provider.dart';
+
+void main() {
+  test(
+    'TypingIndicatorController ignores late remote events after dispose',
+    () async {
+      final client = SupabaseClient('http://localhost', 'test-key');
+      final controller = TypingIndicatorController(client, 'ticket-1');
+
+      // initial state should be empty
+      expect(controller.state.userIds, isEmpty);
+
+      // Simulate a remote "start typing" arriving while alive
+      controller.debugSimulateRemoteTyping('user-2');
+      expect(controller.state.userIds, contains('user-2'));
+
+      // Dispose the controller
+      controller.dispose();
+
+      // Calling the remote handlers after dispose must NOT throw and must be no-ops
+      expect(
+        () => controller.debugSimulateRemoteTyping('user-3'),
+        returnsNormally,
+      );
+      expect(
+        () => controller.debugSimulateRemoteTyping('user-2', stop: true),
+        returnsNormally,
+      );
+
+      // Ensure state was not modified after dispose
+      expect(controller.mounted, isFalse);
+    },
+  );
+}