LibTest/collection/LinkedList/takeWhile_A04_t01.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 Iterable<E> takeWhile(bool test(E value))
 * When the iterator encounters an element e that does not satisfy test,
 * it discards e and moves into the finished state.
 * That is, it does not get or provide any more elements.
 * @description Checks that once an element does not satisfy the test,
 * the iterator stops testing.
 * @author kaigorodov
 */
import "dart:collection";
import "../../../Utils/expect.dart";
import "LinkedList.lib.dart";

void check(LinkedList<MyLinkedListEntry<int>> a, bool test(int element)) {
  bool test2(MyLinkedListEntry<int> entry)=>test(entry.value);

  int last=0;
  for (MyLinkedListEntry<int> entry in a.takeWhile(test2)) {
    Expect.equals(a.elementAt(last), entry);
    Expect.isTrue(test(entry.value));
    last++;
  }
  if (last<a.length) {
    Expect.isFalse(test(a.elementAt(last).value));
  }
}

main() {
  LinkedList<MyLinkedListEntry<int>> a0=toLinkedList([1,3,7,4,5,6,1]);
  check(a0, (int element)=>element==1);
  check(a0, (int element)=>true);
  check(a0, (int element)=>false);
  check(a0, (int element)=>element>4);
  check(a0, (int element)=>element<4);
  check(a0, (int element)=>element==4);
}