import 'package:halkyon_learn_flutter/src/core/instance/instance.dart';
import 'package:halkyon_learn_flutter/src/core/instance/instance_checker.dart';

/// Says that the instances in [answering] answer, and no others.
class FakeInstanceChecker([final Set<Instance> answering = const {}])
    implements InstanceChecker {
  /// The instances asked, in order.
  final asked = <Instance>[];

  @override
  Future<bool> answers(Instance instance) async {
    asked.add(instance);
    return answering.contains(instance);
  }
}