LibTest/collection/DoubleLinkedQueue/skipWhile_A01_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> skipWhile(bool test(E value))
 * Returns an Iterable that skips elements while test is satisfied.
 * @description Checks that all first elements that satisfy test are removed, and
 * elements after that are retained.
 * @author kaigorodov
 */

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

void check(List a0, bool test(var element)) {
  DoubleLinkedQueue queue = new DoubleLinkedQueue.from(a0);
  Iterator it0=a0.iterator;
  Iterator it=queue.skipWhile(test).iterator;
  int skipCount=0;
  
  // skip manually
  bool hasNext0;
  while ((hasNext0=it0.moveNext()) && test(it0.current)) {
    skipCount++;
  }

  // check that the rest of a0 is identical to a
  int len=0;
  for (;;) {
    bool hasNext=it.moveNext();
    Expect.equals(hasNext0, hasNext);
    if (!hasNext0) break;
    len++;
    Expect.equals(it0.current, it.current);
    hasNext0=it0.moveNext();
  }
  Expect.equals(a0.length-skipCount, len);
}

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);
}