Switch analysis_server to use 'package:test'.

pkg/analysis_server/test/integration/analysis/reanalyze_concurrent_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.
 
 /**
  * This test verifies that if reanalysis is performed while reanalysis is in
  * progress, no problems occur.
  *
  * See dartbug.com/21448.
  */
 library test.integration.analysis.reanalyze_concurrent;
 
 import 'dart:async';
 
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../../utils.dart';
 import '../integration_tests.dart';
 
 main() {
   initializeTestEnvironment();
-  defineReflectiveTests(Test);
+  defineReflectiveSuite(() {
+    defineReflectiveTests(Test);
+  });
 }
 
 @reflectiveTest
 class Test extends AbstractAnalysisServerIntegrationTest {
   test_reanalyze_concurrent() {
     String pathname = sourcePath('test.dart');
     String text = '''
 // Do a bunch of imports so that analysis has some work to do.
 import 'dart:io';
 import 'dart:convert';
 import 'dart:async';
 
 main() {}''';
     writeFile(pathname, text);
     standardAnalysisSetup();
     return analysisFinished.then((_) {
       sendAnalysisReanalyze();
       // Wait for reanalysis to start.
       return onServerStatus.first.then((_) {
         sendAnalysisReanalyze();
         return analysisFinished.then((_) {
           // Now that reanalysis has finished, give the server an extra second
           // to make sure it doesn't crash.
           return new Future.delayed(new Duration(seconds: 1));
         });
       });
     });
   }
 }