LibTest/async/Stream/asyncMap_A01_t01.test.dart

/*
 * Copyright (c) 2016, 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  Stream asyncMap(dynamic convert(T event))
 * Creates a new stream with each data event of this stream asynchronously
 * mapped to a new event.
 *
 * This acts like map, except that convert may return a Future, and in that
 * case, the stream waits for that future to complete before continuing with
 * its result.
 *
 * @description Checks that each element of this stream is processed.
 * @author a.semenov@unipro.ru
 */
library asyncMap_A01_t01;
import "dart:async";
import "../../../Utils/expect.dart";

void check<T>(Stream<T> stream, dynamic convert(T event), List expected) {
  AsyncExpect.data(expected, stream.asyncMap(convert));
}

void test(CreateStreamFunction create) {
  check(create([]), (_) => 1, []);
  check(create([1,2,3,4,5]), (e) => e, [1,2,3,4,5]);
  check(create([1,2,3,4,5]), (e) => -e, [-1,-2,-3,-4,-5]);
  check(create([1,2,3,4,5]), (e) => 0, [0,0,0,0,0]);
  // expand to the same stream
  check(
      create([null, "2", -3, 4.0, []]),
      (e) => e,
      [null, "2", -3, 4.0, []]
  );
}