LibTest/collection/SplayTreeMap/SplayTreeMap.from_A03_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.from(Map other, [int compare(K key1, K key2),
/// bool isValidKey(potentialKey)])
/// Creates a [SplayTreeMap] that contains all key/value pairs of [other].
/// @description Checks that if [isValidKey] function specified, then it is
/// called before the [compare} call
/// @author sgrekhov@unipro.ru

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

bool isValidKeyCalled = false;
bool startTesting = false;

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

int compare(var key1, var key2) {
  if (startTesting) {
    Expect.isTrue(isValidKeyCalled);
  }
  return key1.value - key2.value;
}


bool isValidKey(potentialKey) {
  if (startTesting) {
    isValidKeyCalled = true;
  }
  return true;
}

main() {
  C c1 = new C(1);
  C c2 = new C(2);
  Map source = {c1: 1, c2: 2};
  SplayTreeMap map = new SplayTreeMap.from(source, compare, isValidKey);

  startTesting = true;
  isValidKeyCalled = false;
  map[c1];
  isValidKeyCalled = false;
  map[c2];
  isValidKeyCalled = false;
  map.containsKey(c2);
  isValidKeyCalled = false;
  map.remove(c1);
}