Use package:test_reflective_loader instead of reflective_tests.

pkg/analysis_server/test/analysis/get_errors_test.dart

Index: pkg/analysis_server/test/analysis/get_errors_test.dart
diff --git a/pkg/analysis_server/test/analysis/get_errors_test.dart b/pkg/analysis_server/test/analysis/get_errors_test.dart
index 44e1fc5a14d1a168949bfee8162011a37217fc42..846990de003e1b378214636eaaa792e0c3bbf3ad 100644
--- a/pkg/analysis_server/test/analysis/get_errors_test.dart
+++ b/pkg/analysis_server/test/analysis/get_errors_test.dart
@@ -9,14 +9,14 @@ import 'dart:async';
 import 'package:analysis_server/src/domain_analysis.dart';
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analyzer/file_system/file_system.dart';
+import 'package:test_reflective_loader/test_reflective_loader.dart';
 import 'package:unittest/unittest.dart';
 
 import '../analysis_abstract.dart';
-import '../reflective_tests.dart';
 
 main() {
   groupSep = ' | ';
-  runReflectiveTests(GetErrorsTest);
+  defineReflectiveTests(GetErrorsTest);
 }
 
 @reflectiveTest