LibTest/collection/SplayTreeMap/SplayTreeMap.fromIterable_A05_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.

/// @assertion SplayTreeMap.fromIterable(Iterable iterable,
/// {K key(element), V value(element), int compare(K key1, K key2),
/// bool isValidKey(potentialKey)})
/// @description Checks that if [compare] function specified, then it is used for
/// the keys comparison
/// @author sgrekhov@unipro.ru

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

bool compareCalled = false;

class C {
  int value;
  C(this.value);
}

int compare(var key1, var key2) {
  compareCalled = true;
  return key1.value - key2.value;
}

main() {
  C c1 = new C(2);
  C c2 = new C(2);
  Iterable source = [new C(1), c1, c2];
  SplayTreeMap map = new SplayTreeMap.fromIterable(source, compare: compare);

  Expect.equals(2, map.length);
  Expect.equals(c2, map[c1]);
  Expect.isTrue(compareCalled);
}