IKAR/test/call_network_failure_test.dart

import 'dart:async';
import 'dart:io';
import 'package:flutter_test/flutter_test.dart';
import 'package:flutter_webrtc/flutter_webrtc.dart';
import 'package:ikar/core/calls/call_session.dart';
import 'package:ikar/core/calls/ws2_signaling.dart';

final config = Ws2Config(
  userId: 1,
  uri: Uri(scheme: 'wss', host: 'calls.invalid'),
);

class BrokenSignaling extends Ws2Signaling {
  BrokenSignaling() : super(config);
  int sent = 0;
  @override
  Future<void> transmitCandidate({
    required int participantId,
    required String candidate,
    required String sdpMid,
    required int sdpMLineIndex,
    String participantType = 'USER',
    int deviceIdx = 0,
  }) async {
    sent++;
    throw const SocketException('mobile network disconnected');
  }

  @override
  Future<void> hangup({String reason = 'HUNGUP'}) async {}
  @override
  Future<void> close() async {}
}

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();
  test(
    'ICE send failure is handled and late candidates are ignored after hangup',
    () async {
      final signaling = BrokenSignaling();
      final session = CallSession(ws2Config: config, role: CallRole.caller);
      session.bindCandidateSignalingForTesting(signaling, 2);
      final errors = <Object>[];
      runZonedGuarded(() {
        session.receiveLocalCandidateForTesting(
          RTCIceCandidate('candidate:mobile', '0', 0),
        );
      }, (error, stack) => errors.add(error));
      await Future<void>.delayed(Duration.zero);
      final reconnecting = session.isReconnecting;
      await session.hangup();
      runZonedGuarded(() {
        session.receiveLocalCandidateForTesting(
          RTCIceCandidate('candidate:late', '0', 0),
        );
      }, (error, stack) => errors.add(error));
      await Future<void>.delayed(Duration.zero);
      expect(reconnecting, isTrue);
      expect(signaling.sent, 1);
      expect(errors, isEmpty);
      expect(session.currentState, CallSessionState.ended);
      await Future<void>.delayed(const Duration(milliseconds: 1100));
    },
  );
}