Switch analysis_server to use 'package:test'.

pkg/analysis_server/test/search/type_hierarchy_test.dart

Index: pkg/analysis_server/test/search/type_hierarchy_test.dart
diff --git a/pkg/analysis_server/test/search/type_hierarchy_test.dart b/pkg/analysis_server/test/search/type_hierarchy_test.dart
index c3efbbfe5fec58e0ff9af6067b475f53de0b17b9..785fb9485df992752b9be4d4db4d217eaee77fc7 100644
--- a/pkg/analysis_server/test/search/type_hierarchy_test.dart
+++ b/pkg/analysis_server/test/search/type_hierarchy_test.dart
@@ -9,15 +9,17 @@ import 'dart:async';
 import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:analysis_server/src/search/search_domain.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(GetTypeHierarchyTest);
+  defineReflectiveSuite(() {
+    defineReflectiveTests(GetTypeHierarchyTest);
+  });
 }
 
 @reflectiveTest