LibTest/async/Stream/isEmpty_A01_t01.test.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> isEmpty
 * Whether this stream contains any elements.
 * Waits for the first element of this stream, then completes the returned
 * future with `true`.
 * If the stream ends without emitting any elements, the returned future is
 * completed with `false`.
 * @description Checks that the method returns whether this stream contains any
 * elements.
 * @author kaigorodov
 */
library isEmpty_A01_t01;
import "../../../Utils/expect.dart";

void test(CreateStreamFunction create) {
  AsyncExpect.value(true, create([]).isEmpty);
  AsyncExpect.value(false, create([1, 2, 3, null]).isEmpty);
  AsyncExpect.value(true, create(new Iterable.generate(0, (int index) => 1)).isEmpty);
  AsyncExpect.value(false, create(new Iterable.generate(10, (int index) => 1)).isEmpty);
}