Add simple test for SessionlessSyncConfiguration

test/configuration_test.dart

@@ -20,6 +20,7 @@
 import 'dart:io';
 import 'dart:math';
 import 'package:test/test.dart' hide test, throws;
+import 'package:path/path.dart' as path_;
 import '../lib/realm.dart';
 import 'test.dart';
 
@@ -414,4 +415,26 @@ Future<void> main([List<String>? args]) async {
 
     expect(config.path, 'my-custom-path.realm');
   });
+
+  baasTest('Configuration.sessionlessSync', (appConfig) async {
+    final app = App(appConfig);
+    final user = await app.logIn(Credentials.emailPassword(testUsername, testPassword));
+
+    final dir = await Directory.systemTemp.createTemp();
+    final path = path_.join(dir.path, 'test.realm');
+
+    final schema = [Task.schema];
+    final flexibleSyncConfig = Configuration.flexibleSync(user, schema, path: path);
+    final realm = Realm(flexibleSyncConfig);
+    final oid = ObjectId();
+    realm.subscriptions.update((mutableSubscriptions) { 
+      mutableSubscriptions.add(realm.query<Task>(r'_id == $0', [oid]));
+    });
+    realm.write(() => realm.add(Task(oid)));
+    realm.close();
+
+    final sessionlessSyncConfig = Configuration.sessionlessSync(schema, path: path);
+    final sessionlessRealm = Realm(sessionlessSyncConfig);
+    expect(sessionlessRealm.find<Task>(oid), isNotNull);
+  });
 }