expectation-extensions-in-flutter.dart

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import 'package:flutter_test/flutter_test.dart';

extension NullExpectations on Object? {
  void expectNull() => expect(this, isNull);
  void expectNotNull() => expect(this, isNotNull);
}

extension BoolExpectations on bool {
  void expectTrue() => expect(this, true);
  void expectFalse() => expect(this, false);
}

bool boolFunction() => true;
bool otherBoolFunction() => false;
String? stringFunction() => null;
int? intFunction() => 1;

void testIt() {
  boolFunction().expectTrue();
  otherBoolFunction().expectFalse();
  stringFunction().expectNull();
  intFunction().expectNotNull();
}