LibTest/async/Stream/every_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 Future<bool> every(bool test(T element))
 * Checks whether test accepts all elements provided by this stream.
 * Completes the Future when the answer is known.
 * @description Checks that correct answer is passed to the future.
 * @author kaigorodov
 */

import "dart:async";
import "../../../Utils/async_utils.dart";
import "../../../Utils/expect.dart";

check(Iterable<int> data, bool test(int element), bool expected) {
  Stream s=new Stream.fromIterable(data);
  asyncStart();
  s.every(test).then((bool actual){
    Expect.equals(expected, actual);
    asyncEnd();
  });
}

main() {
  check([], (int element)=>true, true);
  check([1,2,3], (int element)=>element!=null, true);
  check([1,2,3,null], (int element)=>element==null, false);
  check(new Iterable.generate(0, (int index)=>index), (int element)=>false, true);
  check(new Iterable.generate(10, (int index)=>index), (int element)=>false, false);
  check(new Iterable.generate(0, (int index)=>index), (int element)=>true, true);
  check(new Iterable.generate(2, (int index)=>index), (int element)=>true, true);
  check(new Iterable.generate(10, (int index)=>index*5), (int element)=>element==30, false);
  check(new Iterable.generate(10, (int index)=>index*5), (int element)=>element!=30, false);
  check(new Iterable.generate(10, (int index)=>index*5), (int element)=>element>=0, true);
}