dotdoom

import 'dart:async';

Future<void> b(value) async {
  await Future.delayed(Duration(seconds: 0));
  // OR: remove the line ABOVE for fun effect.
  print('b(${value})');
}

Future<void> a(value) async {
  print('a(${value})');

dotdoom

  testWidgets('StreamController adding null wtf', (WidgetTester tester) async {
    final source = StreamController<String>();
    var index = 0;
    await tester.pumpWidget(MaterialApp(
      home: StreamBuilder(
        stream: source.stream,
        builder: (context, snapshot) {
          index += 1;
          return Text('$index');