Make Completers asynchronous.

pkg/scheduled_test/test/value_future_test.dart

 // Copyright (c) 2013, 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 value_future_test;
 
 import 'dart:async';
 
 import 'package:scheduled_test/src/value_future.dart';
 import 'package:unittest/unittest.dart';
@@ skipping 80 matching lines @@
   group('after successful completion', () {
     var future;
 
     setUp(() {
       var completer = new Completer();
       future = new ValueFuture(completer.future);
       completer.complete(12);
     });
 
     test('.value is the result of the future', () {
-      expect(future.value, equals(12));
+      future.then(expectAsync1((_) {
+        expect(future.value, equals(12));
+      }));

[nweiz, 2013/05/07 00:11:52]

These can be

    expect(future.then((_) => future.value), completion(equals(12)));

etc

[floitsch, 2013/05/13 11:19:25]

done in CL 15128002.

     });
 
     test('.hasValue is true', () {
-      expect(future.hasValue, isTrue);
+      future.then(expectAsync1((_) {
+        expect(future.hasValue, isTrue);
+      }));
     });
   });
 
   group('after an error completion', () {
     var future;
+    var safeFuture;
 
     setUp(() {
       var completer = new Completer();
       future = new ValueFuture(completer.future);
-      future.catchError((e) {});
+      safeFuture = future.catchError((e) {});
       completer.completeError('bad');
     });
 
     test('.value is null', () {
-      expect(future.value, isNull);
+      safeFuture.then(expectAsync1((_) {
+        expect(future.value, isNull);
+      }));
     });
 
     test('.hasValue is false', () {
-      expect(future.hasValue, isFalse);
+      safeFuture.then(expectAsync1((_) {
+        expect(future.hasValue, isFalse);
+      }));
     });
   });
 }