LibTest/collection/HashMap/HashMap.fromIteratables_A02_t01.dart

// Copyright (c) 2016, 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.

// @dart = 2.9

/// @assertion HashMap.fromIterables(Iterable<K> keys, Iterable<V> values)
/// If [keys] contains the same object multiple times, the last occurrence
/// overwrites the previous value.
/// @description Checks that if keys contains the same object several times then
/// the last occurrence overrides the previous value
/// @author sgrekhov@unipro.ru

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

main() {
  DoubleLinkedQueue keys = new DoubleLinkedQueue();
  keys.add(1);
  keys.add(2);
  keys.add(2);
  keys.add(2);
  DoubleLinkedQueue values = new DoubleLinkedQueue();
  values.add('val1');
  values.add('val2');
  values.add('val3');
  values.add('val4');

  HashMap map = new HashMap.fromIterables(keys, values);
  Expect.equals(2, map.length);
  Expect.equals('val1', map[1]);
  Expect.equals('val4', map[2]);
}