Switch analysis_server to use 'package:test'.

pkg/analysis_server/test/integration/analysis/reanalyze_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.analysis.reanalyze;
 
 import 'package:analysis_server/plugin/protocol/protocol.dart';
+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_reanalyze() {
     String pathname = sourcePath('test.dart');
     String text = 'main() {}';
     writeFile(pathname, text);
     standardAnalysisSetup();
     return analysisFinished.then((_) {
       // Make sure that reanalyze causes analysis to restart.
       bool analysisRestarted = false;
       onServerStatus.listen((ServerStatusParams data) {
         if (data.analysis != null) {
           if (data.analysis.isAnalyzing) {
             analysisRestarted = true;
           }
         }
       });
       sendAnalysisReanalyze();
       return analysisFinished.then((_) {
         expect(analysisRestarted, isTrue);
       });
     });
   }
 }