Status updates, and minor fixes to tests of async-await.

tests/language/asyncstar_yield_test.dart

 // Copyright (c) 2015, 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.
 
 import "dart:async";
 import "package:expect/expect.dart";
 import "package:async_helper/async_helper.dart";
 
 Stream<int> foo1() async* {
   yield 1;
   var p = await new Future.value(10);
   yield p + 10;
 }
 
 Stream<int> foo2() async* {
   int i = 0;
   while (true) {
-    await (new Future.delayed(new Duration(milliseconds: 0), () {}));
+    await (new Future.delayed(new Duration(milliseconds: 10), () {}));
     if (i > 10) return;
     yield i;
     i++;
   }
 }
 
 Stream<int> foo3(p) async* {
   int i = 0;
   bool t = false;
   yield null;
@@ skipping 21 matching lines @@
     while (true) {
       yield i;
       i++;
     }
   } finally {
     // Canceling the stream-subscription should run the finalizer.
     finalized.complete(true);
   }
 }
 
-main () async {
-  asyncStart();
+test() async {
   Expect.listEquals([1, 20], await (foo1().toList()));
   Expect.listEquals([0, 1, 2, 3], await (foo2().take(4).toList()));
   Expect.listEquals([null, -1, 0, 1, 2, 3, 0, 1, 2, 3],
       await (foo3(4).take(10).toList()));
   Expect.listEquals([0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
       await (foo4().take(10).toList()));
   Expect.isTrue(await (finalized.future));
-  asyncEnd();
+}
+
+main ()  {
+  asyncStart();
+  test().then((_) {
+    asyncEnd();
+  });
 }