Switch analysis_server to use 'package:test'.

pkg/analysis_server/test/services/correction/test_all.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.correction;
 
-import 'package:unittest/unittest.dart';
+import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../../utils.dart';
 import 'assist_test.dart' as assist_test;
 import 'change_test.dart' as change_test;
 import 'fix_test.dart' as fix_test;
 import 'levenshtein_test.dart' as levenshtein_test;
 import 'name_suggestion_test.dart' as name_suggestion_test;
 import 'organize_directives_test.dart' as organize_directives_test;
 import 'sort_members_test.dart' as sort_members_test;
 import 'source_range_test.dart' as source_range_test;
 import 'status_test.dart' as status_test;
 import 'strings_test.dart' as strings_test;
 import 'util_test.dart' as util_test;
 
 /// Utility for manually running all tests.
 main() {
   initializeTestEnvironment();
-  group('correction', () {
+  defineReflectiveSuite(() {
     assist_test.main();
     change_test.main();
     fix_test.main();
     levenshtein_test.main();
     name_suggestion_test.main();
     organize_directives_test.main();
     sort_members_test.main();
     source_range_test.main();
     status_test.main();
     strings_test.main();
     util_test.main();
-  });
+  }, name: 'correction');
 }