LibTest/core/Map/Map_class_A01_t03.dart

/*
 * Copyright (c) 2011, 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 Map<K, V> abstract class
 * An unordered collection of key-value pairs, from which you retrieve a value
 * by using its associated key.
 * Each key must be unique. Null values are supported, but null keys are not.
 * @description Checks that the map works correctly with hashcode collisions.
 * @author msyabro
 */
import "../../../Utils/expect.dart";

class A {
  String s;
  A(this.s) {}
  int get hashCode {
    return s.length;
  }
}

main() {
  Map<A, Object> map = new Map<A, Object>();
  A a1 = new A("aa");
  A a2 = new A("bb");
  
  map[a1] = 1;
  map[a2] = 2;
  Expect.isTrue(map.length == 2);
  Expect.isTrue(map.containsKey(a1));
  Expect.isTrue(map.containsKey(a2));
  Expect.isTrue(!map.containsKey(new A("99")));
}