LibTest/collection/UnmodifiableMapBase/forEach_A01_t01.dart

// Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

/// @assertion  void forEach(void action(K key, V value))
/// Applies [f] to each key-value pair of the map.
/// @description Checks that all mappings are iterated exactly once.
/// @author iarkh@unipro.ru

import "dart:collection";
import "../../../Utils/expect.dart";
import "unmodifiablemapbase.lib.dart";

main() {
  List keys = new List.filled(2, 0);
  keys[0] = 0;
  keys[1] = 0;
  List values = new List.filled(2, "");
  void f(var i, Object? value) {
    keys[i] += 1;
    values[i] = value;
  }

  UnmodifiableMapBase base = new UnmodifiableMapBaseImpl({0 : "3", 1 : "5"});
  base.forEach(f);
  
  Expect.isTrue(keys[0] == 1 && keys[1] == 1);
  Expect.isTrue(values[0] == "3" && values[1] == "5");
}