Switch analysis_server to use 'package:test'.

pkg/analysis_server/test/analysis/notification_implemented_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.analysis.notification.implemented;
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/services/index/index.dart';
+import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
-import 'package:unittest/unittest.dart';
 
 import '../analysis_abstract.dart';
 import '../utils.dart';
 
 main() {
   initializeTestEnvironment();
-  defineReflectiveTests(AnalysisNotificationImplementedTest);
+  defineReflectiveSuite(() {
+    defineReflectiveTests(AnalysisNotificationImplementedTest);
+  });
 }
 
 @reflectiveTest
 class AnalysisNotificationImplementedTest extends AbstractAnalysisTest {
   List<ImplementedClass> implementedClasses;
   List<ImplementedMember> implementedMembers;
 
   /**
    * Validates that there is an [ImplementedClass] at the offset of [search].
    *
@@ skipping 394 matching lines @@
   }
 
   Future waitForImplementedElements() {
     Future waitForNotification(int times) {
       if (times == 0 || implementedClasses != null) {
         return new Future.value();
       }
       return new Future.delayed(
           new Duration(milliseconds: 1), () => waitForNotification(times - 1));
     }
+
     return waitForNotification(30000);
   }
 }