LibTest/collection/LinkedList/takeWhile_A03_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))
 * Every new Iterator of the returned Iterable
 * starts iterating over the elements of this.
 * @description Checks that every new iterator starts iterating over the elements of this.
 * @author kaigorodov
 */
import "dart:collection";
import "../../../Utils/expect.dart";
import "LinkedList.lib.dart";

void check(LinkedList<MyLinkedListEntry<int>> a0, bool test0(int element)) {
  MyLinkedListEntry<int> el;
  
  bool test(MyLinkedListEntry<int> entry) {
    bool res=test0(entry.value);
    if (res) {
      el=entry;
    }
    return res;
  }
  
  Iterable<MyLinkedListEntry<int>> itbl=a0.takeWhile(test);
  
  for (int k=0; k<5; k++) {
    Iterator<MyLinkedListEntry<int>> it=itbl.iterator;
    int i=0;
    while (it.moveNext()) {
      Expect.equals(a0.elementAt(i), el);
      Expect.equals(el, it.current);
      i++;
    }  
  }
}

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);
}