Upgrading tests with unittest deprecations

tests/lib/async/timer_repeat_test.dart

 // Copyright (c) 2012, 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 timer_repeat_test;
 
 import 'dart:async';
 import '../../../pkg/unittest/lib/unittest.dart';
 
 const Duration TIMEOUT = const Duration(milliseconds: 500);
@@ skipping 12 matching lines @@
     expect(iteration, ITERATIONS);
     timer.cancel();
   }
 }
 
 main() {
   test("timer_repeat", () {
     iteration = 0;
     startTime = new DateTime.now().millisecondsSinceEpoch;
     timer = new Timer.periodic(TIMEOUT,
-        expectAsync1(timeoutHandler, count: ITERATIONS));
+        expectAsync(timeoutHandler, count: ITERATIONS));
   });
 }