LibTest/collection/SplayTreeMap/SplayTreeMap.fromIterable_A06_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 [isValidKey] function is 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);
  Iterable<C> source = [c1, c2];
  SplayTreeMap map = new SplayTreeMap.fromIterable(source, compare: compare,
      isValidKey: isValidKey);

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