tomaszpolanski

final String? text;

@override
Widget build(BuildContext context) {
  final _text = text; // Assign field to local final variable
  return Column(
    children: [
      if (_text != null) Text(_text), // The `!` is not longer needed
    ],
  );

tomaszpolanski

void main() {
  final A example = B();
  if (example.text != null) {
    print(example.text!.length); // Throws null reference exception
  }
}

tomaszpolanski

class A {
  A(this.text);

  final String? text; // Final field
}

class B implements A {
  bool _first = true;

  @override

tomaszpolanski

final String? text;

@override
Widget build(BuildContext context) {
  return Column(
    children: [
      if (text != null) Text(text!), // Won't compile without `!` in `text!` 
    ],
  );
}

tomaszpolanski

class A {
  A(this.text);

  final String? text; // Final field
}

class B implements A {
  bool _first = true;

  @override

tomaszpolanski

### Keybase proof

I hereby claim:

  * I am tomaszpolanski on github.
  * I am tomekpolanski (https://keybase.io/tomekpolanski) on keybase.
  * I have a public key ASCKUlioKVilX-ZWBBM_SSeGjxkVO-nssaEU9BDiqg8bSQo

To claim this, I am signing this object:

tomaszpolanski

import 'package:integration_test/integration_test.dart';

import 'route_test.dart' as route;
import 'simple_test.dart' as simple;
import 'subfolder/sub_test.dart' as subfolder_sub;
import 'testing_test.dart' as testing;

void main() {
  IntegrationTestWidgetsFlutterBinding.ensureInitialized();
  route.main();

tomaszpolanski

final finder = find.text('Done');
for (int i = 0; i < 10; i++) {
 await tester.pump(const Duration(seconds: 1));
 if (findsOneWidget.matches(finder, {})) {
   break;
 }
}

tomaszpolanski

abstract class TimeProvider {
 Future<void> delayed(Duration duration);
}

class TimeProviderImpl implements TimeProvider {
 @override
 Future<void> delayed(Duration duration) => Future<void>.delayed(duration);
}

class MockTimeProvider implements TimeProvider {

tomaszpolanski

testWidgets('time test', (tester) async {
    const done = Key('done');
    const pending = Key('pending');
    await tester.pumpWidget(
      FutureBuilder(
        future: Future<void>.delayed(const Duration(seconds: 10)),
        builder: (context, sn) {
          return sn.connectionState == ConnectionState.done
              ? const SizedBox(key: done)
              : const SizedBox(key: pending);