LibTest/async/Stream/map_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 Stream<S> map<S>(S convert(T event))
 * Creates a new stream that converts each element of this stream to a new value
 * using the convert function.
 * @description Checks that each element of this stream is processed.
 * @author kaigorodov
 */
library map_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.map(convert));
}

void test(CreateStreamFunction create) {
  check(create([]), (_) => 1, []);
  check(create([1, 2, 3, 4, 5]), (e) => e, [1, 2, 3, 4, 5]);
  check<int>(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, []]);
}