Switch analysis_server to use 'package:test'.

pkg/analysis_server/test/services/refactoring/rename_local_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.services.refactoring.rename_local;
 
 import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:analysis_server/src/services/correction/status.dart';
+import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
-import 'package:unittest/unittest.dart';
 
 import '../../utils.dart';
 import 'abstract_rename.dart';
 
 main() {
   initializeTestEnvironment();
-  defineReflectiveTests(RenameLocalTest);
+  defineReflectiveSuite(() {
+    defineReflectiveTests(RenameLocalTest);
+  });
 }
 
 @reflectiveTest
 class RenameLocalTest extends RenameRefactoringTest {
   test_checkFinalConditions_hasLocalFunction_after() async {
     indexTestUnit('''
 main() {
   int test = 0;
   newName() => 1;
 }
@@ skipping 518 matching lines @@
 main() {
   int test = 0;
 }
 ''');
     // configure refactoring
     createRenameRefactoringAtString('test = 0');
     // old name
     expect(refactoring.oldName, 'test');
   }
 }