LibTest/collection/DoubleLinkedQueue/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  will start 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";

void check(List a0, bool test0(var element)) {
  DoubleLinkedQueue queue = new DoubleLinkedQueue.from(a0);
  var el;
  bool test(var element) {
    bool res=test0(element);
    if (res) {
      el=element;
    }
    return res;
  }
  
  Iterable itbl=queue.takeWhile(test);
  
  for (int k=0; k<5; k++) {
    Iterator it=itbl.iterator;
    int i=0;
    while (it.moveNext()) {
      Expect.equals(a0[i], el);
      Expect.equals(el, it.current);
      i++;
    }  
  }
}

main() {
  List a0=[1,3,7,4,5,6];
  check(a0, (var element)=>element==1);
  check(a0, (var element)=>true);
  check(a0, (var element)=>false);
  check(a0, (var element)=>element>4);
  check(a0, (var element)=>element<4);
  check(a0, (var element)=>element==4);
}