LibTest/async/Stream/lastWhere_A05_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<T> lastWhere (bool test(T element),
 *     {@deprecated dynamic defaultValue(),  T orElse()})
 *
 * Finds the last element in this stream matching test.
 *
 * If this stream emits an error, the returned future is completed with that
 * error, and processing stops.
 *
 * Otherwise as firstWhere, except that the last matching element is found
 * instead of the first. That means that a non-error result cannot be provided
 * before this stream is done.
 *
 * The defaultValue parameter is deprecated, and orElse should be used instead.
 * @description Checks that if [test] throws error, the returned future will
 * receive this error.
 * @author a.semenov@unipro
 */
library lastWhere_A05_t01;
import "../../../Utils/expect.dart";

void test(CreateStreamFunction create) {
  AsyncExpect.error("a", create([1, 2, 3]).lastWhere((e) => throw "a"));
  AsyncExpect.error(
      "b",
      create([1, 2, 3]).lastWhere((e) { if (e == 3) throw "b"; return true; })
  );
}