Switch analysis_server to use 'package:test'.

pkg/analysis_server/test/analysis/notification_implemented_test.dart

Index: pkg/analysis_server/test/analysis/notification_implemented_test.dart
diff --git a/pkg/analysis_server/test/analysis/notification_implemented_test.dart b/pkg/analysis_server/test/analysis/notification_implemented_test.dart
index ee3959a0932f3b4b9129fbd258fecf64f34877ae..387454b7ec4a16dea11dc2bf13a3db9f7dc6c7b5 100644
--- a/pkg/analysis_server/test/analysis/notification_implemented_test.dart
+++ b/pkg/analysis_server/test/analysis/notification_implemented_test.dart
@@ -9,15 +9,17 @@ 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
@@ -432,6 +434,7 @@ class B extends A {
       return new Future.delayed(
           new Duration(milliseconds: 1), () => waitForNotification(times - 1));
     }
+
     return waitForNotification(30000);
   }
 }