Switch analysis_server to use 'package:test'.

pkg/analysis_server/test/integration/server/shutdown_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.shutdown;
 
 import 'dart:async';
 
+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_shutdown() {
     return sendServerShutdown().then((_) {
       return new Future.delayed(new Duration(seconds: 1)).then((_) {
         sendServerGetVersion().then((_) {
           fail('Server still alive after server.shutdown');
         });
         // Give the server time to respond before terminating the test.
         return new Future.delayed(new Duration(seconds: 1));
       });
     });
   }
 }