rtc_peerconnection_test.dart

// Flutter imports:
import 'package:flutter/services.dart';

// Package imports:
import 'package:flutter_test/flutter_test.dart';

// Project imports:
import 'package:flutter_webrtc_plus/src/native/rtc_data_channel_impl.dart';
import 'package:flutter_webrtc_plus/src/native/rtc_peerconnection_impl.dart';

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();
  final channel = MethodChannel('FlutterWebRTC.Method');
  setUp(() {
    channel.setMockMethodCallHandler((MethodCall methodCall) async {
      await ServicesBinding.instance.defaultBinaryMessenger
          .handlePlatformMessage(
              'FlutterWebRTC/peerConnectionEvent', null, (ByteData? data) {});
      await ServicesBinding.instance.defaultBinaryMessenger
          .handlePlatformMessage(
              'FlutterWebRTC/dataChannelEvent', null, (ByteData? data) {});
    });
  });

  tearDown(() {
    channel.setMockMethodCallHandler(null);
  });

  test(
      'Validate that not setting any public delegate this will not break the implementation by throwing NPE',
      () {
    final pc = RTCPeerConnectionNative('', {});
    final events = [
      'signalingState',
      'iceGatheringState',
      'iceConnectionState',
      'onCandidate',
      'onAddStream',
      'onRemoveStream',
      'onAddTrack',
      'onRemoveTrack',
      'didOpenDataChannel',
      'onRenegotiationNeeded'
    ];

    pc.onDataChannel = (dc) {
      final channel = dc as RTCDataChannelNative;
      channel.eventListener(<String, dynamic>{
        'event': 'dataChannelStateChanged',
        'id': 0,
        'flutterId': '',
        'state': 'open'
      });
    };

    for (var event in events) {
      pc.eventListener(<String, dynamic>{
        'event': event,

        //Minimum values for signalingState, iceGatheringState, iceConnectionState
        'state': 'stable', // just picking one valid value from the list

        //Minimum values for onCandidate
        'candidate': {'candidate': '', 'sdpMid': '', 'sdpMLineIndex': 1},

        //Minimum values for onAddStream
        'streamId': '',
        'audioTracks': [],
        'videoTracks': [],

        //Minimum values for onRemoveTrack
        'trackId': '',

        //Minimum values for onAddTrack
        'track': {
          'id': '',
          'label': '',
          'kind': '',
          'enabled': false,
        },
        'id': 0,
        'label': '',
        'flutterId': '',
      });
    }
  });
}