Fix error_group_test.

sdk/lib/_internal/pub/test/error_group_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 error_group_test;
 
 import 'dart:async';
 
 import 'package:unittest/unittest.dart';
 
@@ skipping 45 matching lines @@
     test('should pass through a value from the future', () {
       expect(future, completion(equals('value')));
       expect(errorGroup.done, completes);
       completer.complete('value');
     });
 
     test("shouldn't allow additional futures or streams once .done has "
         "been called", () {
       completer.complete('value');
 
-      expect(() => errorGroup.registerFuture(new Future.value()),
-          throwsStateError);
-      expect(() => errorGroup.registerStream(new StreamController().stream),
-          throwsStateError);
+      completer.future.then(expectAsync1((_) {

[nweiz, 2013/05/07 00:18:11]

As in the other CL, convert these to "expect(completer.future.then((_) => ...),
throwsStateError)".

[floitsch, 2013/06/13 15:52:35]

done in https://codereview.chromium.org/16950010

+        expect(() => errorGroup.registerFuture(new Future.value()),
+            throwsStateError);
+        expect(() => errorGroup.registerStream(new StreamController().stream),
+            throwsStateError);
+      }));
     });
 
     test('should pass through an exception from the future if it has a '
         'listener', () {
       expect(future, throwsFormatException);
       // errorGroup shouldn't top-level the exception
       completer.completeError(new FormatException());
     });
 
     test('should notify the error group of an exception from the future even '
@@ skipping 340 matching lines @@
       expect(stream.toList(), completion(equals(['value1', 'value2'])));
       controller..add('value1')..add('value2')..close();
 
       expect(stream.toList().then((_) {
         // shouldn't cause a top-level exception
         completer.completeError(new FormatException());
       }), completes);
     });
   });
 }