NOTE: These changes are included in Flutter 3.13.0. This package is no longer needed.

Temporary package to add support for mocking EventChannels in Flutter

Features

Adds setMockStreamHandler to TestDefaultBinaryMessenger with an extension

Usage

import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:mock_event_channel/mock_event_channel.dart';

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  test('No arguments', () {
    const channel = EventChannel('mock_event_channel');
    TestDefaultBinaryMessengerBinding.instance!.defaultBinaryMessenger
        .setMockStreamHandler(
      channel,
      MockStreamHandler.inline(
        onListen: (arguments, events) {
          events.success('asdf');
          events.error(code: 'asdf');
          events.endOfStream();
        },
      ),
    );

    final stream = channel.receiveBroadcastStream();
    expectLater(
      stream,
      emitsInOrder(
        [
          'asdf',
          emitsError(
            isA<PlatformException>().having((e) => e.code, 'code', 'asdf'),
          ),
          emitsDone
        ],
      ),
    );
  });
}

Additional information

This package will be discontinued when this PR gets released to stable: https://github.com/flutter/flutter/pull/124415

This package is an exact copy of that code, so all you need to do when that PR is released is remove this package from your pubspec.