Replace @ReflectiveTestCase() with @reflectiveTest.

pkg/analysis_server/test/services/correction/levenshtein_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.correction.levenshtein;
 
 import 'package:analysis_server/src/services/correction/levenshtein.dart';
 import 'package:unittest/unittest.dart';
 
 import '../../reflective_tests.dart';
 
 
 main() {
   groupSep = ' | ';
   runReflectiveTests(LevenshteinTest);
 }
 
-@ReflectiveTestCase()
+@reflectiveTest
 class LevenshteinTest {
   void test_different_caseInsensitive() {
     expect(levenshtein('Saturday', 'sunday', 5, caseSensitive: false), 3);
     expect(levenshtein('SaturDay', 'sunday', 5, caseSensitive: false), 3);
   }
 
   void test_different_onThreshold() {
     expect(levenshtein('', 'abcde', 5), 5);
     expect(levenshtein('abcde', '', 5), 5);
   }
@@ skipping 31 matching lines @@
 
   void test_same() {
     expect(levenshtein('', '', 5), 0);
     expect(levenshtein('test', 'test', 5), 0);
   }
 
   void test_same_caseInsensitive() {
     expect(levenshtein('test', 'Test', 5, caseSensitive: false), 0);
   }
 }