Switch analysis_server to use 'package:test'.

pkg/analysis_server/test/analysis/test_all.dart

Index: pkg/analysis_server/test/analysis/test_all.dart
diff --git a/pkg/analysis_server/test/analysis/test_all.dart b/pkg/analysis_server/test/analysis/test_all.dart
index a0cd6d31413723088232db6b18a08238875fd1ac..c8457d118a4584fa29c6aca116707d4d450bf106 100644
--- a/pkg/analysis_server/test/analysis/test_all.dart
+++ b/pkg/analysis_server/test/analysis/test_all.dart
@@ -3,7 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 library test.analysis;
 
-import 'package:unittest/unittest.dart';
+import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../utils.dart';
 import 'get_errors_test.dart' as get_errors_test;
@@ -30,7 +30,7 @@ import 'update_content_test.dart' as update_content_test;
  */
 main() {
   initializeTestEnvironment();
-  group('analysis', () {
+  defineReflectiveSuite(() {
     get_errors_test.main();
     get_hover_test.main();
     get_navigation_test.main();
@@ -47,5 +47,5 @@ main() {
     notification_overrides_test.main();
     set_priority_files_test.main();
     update_content_test.main();
-  });
+  }, name: 'analysis');
 }