Replace @ReflectiveTestCase() with @reflectiveTest.

pkg/analysis_server/test/services/search/search_engine_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.src.search.search_engine;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/services/index/index.dart';
 import 'package:analysis_server/src/services/index/local_memory_index.dart';
@@ skipping 50 matching lines @@
     return buffer.toString();
   }
 }
 
 
 class MockIndex extends TypedMock implements Index {
   noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
 }
 
 
-@ReflectiveTestCase()
+@reflectiveTest
 class SearchEngineImplTest extends AbstractSingleUnitTest {
   Index index;
   SearchEngineImpl searchEngine;
 
   void setUp() {
     super.setUp();
     index = createLocalMemoryIndex();
     searchEngine = new SearchEngineImpl(index);
   }
 
@@ skipping 558 matching lines @@
         pattern).then((List<SearchMatch> matches) {
       _assertMatches(matches, expectedMatches);
     });
   }
 
   static void _assertMatches(List<SearchMatch> matches,
       List<ExpectedMatch> expectedMatches) {
     expect(matches, unorderedEquals(expectedMatches));
   }
 }