Switch analysis_server to use 'package:test'.

pkg/analysis_server/test/services/refactoring/rename_library_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_library;
 
 import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:analyzer/src/generated/source.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(RenameLibraryTest);
+  defineReflectiveSuite(() {
+    defineReflectiveTests(RenameLibraryTest);
+  });
 }
 
 @reflectiveTest
 class RenameLibraryTest extends RenameRefactoringTest {
   void test_checkNewName() {
     indexTestUnit('''
 library my.app;
 ''');
     _createRenameRefactoring();
     // null
@@ skipping 67 matching lines @@
         '/part.dart',
         '''
 part of the.new.name;
 ''');
   }
 
   void _createRenameRefactoring() {
     createRenameRefactoringForElement(testUnitElement.library);
   }
 }