Switch analysis_server to use 'package:test'.

pkg/analysis_server/test/edit/test_all.dart

Index: pkg/analysis_server/test/edit/test_all.dart
diff --git a/pkg/analysis_server/test/edit/test_all.dart b/pkg/analysis_server/test/edit/test_all.dart
index ef861d8ce4e5ddd6bc12087a813356072cda5d0b..914d34d8e0ccc61f4dee8d85c3c3f43e809bb121 100644
--- a/pkg/analysis_server/test/edit/test_all.dart
+++ b/pkg/analysis_server/test/edit/test_all.dart
@@ -4,7 +4,7 @@
 
 library test.edit.all;
 
-import 'package:unittest/unittest.dart';
+import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../utils.dart';
 import 'assists_test.dart' as assists_test;
@@ -19,12 +19,12 @@ import 'sort_members_test.dart' as sort_members_test;
  */
 main() {
   initializeTestEnvironment();
-  group('edit', () {
+  defineReflectiveSuite(() {
     assists_test.main();
     fixes_test.main();
     format_test.main();
     organize_directives_test.main();
     refactoring_test.main();
     sort_members_test.main();
-  });
+  }, name: 'edit');
 }