Switch analysis_server to use 'package:test'.

pkg/analysis_server/test/search/search_result_test.dart

Index: pkg/analysis_server/test/search/search_result_test.dart
diff --git a/pkg/analysis_server/test/search/search_result_test.dart b/pkg/analysis_server/test/search/search_result_test.dart
index 2f3ef07d3c4cea166dd4790cecdc9f36f0a02b65..4fc5a998a1850fc1b5c128b5d11606fedb207af3 100644
--- a/pkg/analysis_server/test/search/search_result_test.dart
+++ b/pkg/analysis_server/test/search/search_result_test.dart
@@ -6,14 +6,16 @@ library test.search.search_result;
 
 import 'package:analysis_server/src/protocol_server.dart';
 import 'package:analysis_server/src/services/search/search_engine.dart';
+import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
-import 'package:unittest/unittest.dart';
 
 import '../utils.dart';
 
 main() {
   initializeTestEnvironment();
-  defineReflectiveTests(SearchResultKindTest);
+  defineReflectiveSuite(() {
+    defineReflectiveTests(SearchResultKindTest);
+  });
 }
 
 @reflectiveTest