Switch analysis_server to use 'package:test'.

pkg/analysis_server/test/services/search/test_all.dart

Index: pkg/analysis_server/test/services/search/test_all.dart
diff --git a/pkg/analysis_server/test/services/search/test_all.dart b/pkg/analysis_server/test/services/search/test_all.dart
index 187d3f3e58b36d10911fcb8f187d6266eca2bd65..f3d733d8896c6d3478562cf2b3f93680202e86cf 100644
--- a/pkg/analysis_server/test/services/search/test_all.dart
+++ b/pkg/analysis_server/test/services/search/test_all.dart
@@ -4,7 +4,7 @@
 
 library test.services.src.search.all;
 
-import 'package:unittest/unittest.dart';
+import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../../utils.dart';
 import 'hierarchy_test.dart' as hierarchy_test;
@@ -15,8 +15,8 @@ import 'search_engine_test.dart' as search_engine_test;
  */
 main() {
   initializeTestEnvironment();
-  group('search', () {
+  defineReflectiveSuite(() {
     hierarchy_test.main();
     search_engine_test.main();
-  });
+  }, name: 'search');
 }