Switch analysis_server to use 'package:test'.

pkg/analysis_server/test/integration/server/set_subscriptions_invalid_service_test.dart

 // Copyright (c) 2014, 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 test.integration.server.set.subscriptions.invalid.service;
 
+import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
-import 'package:unittest/unittest.dart';
 
 import '../../utils.dart';
 import '../integration_tests.dart';
 
 main() {
   initializeTestEnvironment();
-  defineReflectiveTests(Test);
+  defineReflectiveSuite(() {
+    defineReflectiveTests(Test);
+  });
 }
 
 @reflectiveTest
 class Test extends AbstractAnalysisServerIntegrationTest {
   test_setSubscriptions_invalidService() {
     // TODO(paulberry): verify that if an invalid service is specified, the
     // current subscriptions are unchanged.
     return server.send("server.setSubscriptions", {
       'subscriptions': ['bogus']
     }).then((_) {
       fail('setSubscriptions should have produced an error');
     }, onError: (error) {
       // The expected error occurred.
     });
   }
 }