Added new version of reduce.

tests/lib/async/stream_min_max_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.
-
-library stream_min_max_test;
-
-import "package:expect/expect.dart";
-import 'dart:async';
-import 'dart:isolate';
-import '../../../pkg/unittest/lib/unittest.dart';
-import 'event_helper.dart';
-
-const int big = 1000000;
-const double inf = double.INFINITY;
-List intList = const [-0, 0, -1, 1, -10, 10, -big, big];
-List doubleList = const [-0.0, 0.0, -1.0, 1.0, -10.0, 10.0, -inf, inf];
-
-main() {
-  testMinMax(name, iterable, min, max, [int compare(a, b)]) {
-    test("$name-min", () {
-      StreamController c = new StreamController();
-      Future f = c.stream.min(compare);
-      f.then(expectAsync1((v) { Expect.equals(min, v);}));
-      new Events.fromIterable(iterable).replay(c);
-    });
-    test("$name-max", () {
-      StreamController c = new StreamController();
-      Future f = c.stream.max(compare);
-      f.then(expectAsync1((v) { Expect.equals(max, v);}));
-      new Events.fromIterable(iterable).replay(c);
-    });
-  }
-
-  testMinMax("const-int", intList, -big, big);
-  testMinMax("list-int", intList.toList(), -big, big);
-  testMinMax("set-int", intList.toSet(), -big, big);
-
-  testMinMax("const-double", doubleList, -inf, inf);
-  testMinMax("list-double", doubleList.toList(), -inf, inf);
-  testMinMax("set-double", doubleList.toSet(), -inf, inf);
-
-  int reverse(a, b) => b.compareTo(a);
-  testMinMax("rev-int", intList, big, -big, reverse);
-  testMinMax("rev-double", doubleList, inf, -inf, reverse);
-}