Switch analysis_server to use 'package:test'.

pkg/analysis_server/test/integration/server/test_all.dart

Index: pkg/analysis_server/test/integration/server/test_all.dart
diff --git a/pkg/analysis_server/test/integration/server/test_all.dart b/pkg/analysis_server/test/integration/server/test_all.dart
index 2b81672cbabaadbc4502be5496e7ae59f1b5f707..9402f5f8e6ce6f4d9ec8855c68d056390e77b0df 100644
--- a/pkg/analysis_server/test/integration/server/test_all.dart
+++ b/pkg/analysis_server/test/integration/server/test_all.dart
@@ -4,7 +4,7 @@
 
 library test.integration.server.all;
 
-import 'package:unittest/unittest.dart';
+import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../../utils.dart';
 import 'get_version_test.dart' as get_version_test;
@@ -19,11 +19,11 @@ import 'status_test.dart' as status_test;
  */
 main() {
   initializeTestEnvironment();
-  group('server', () {
+  defineReflectiveSuite(() {
     get_version_test.main();
     set_subscriptions_test.main();
     set_subscriptions_invalid_service_test.main();
     shutdown_test.main();
     status_test.main();
-  });
+  }, name: 'server');
 }