more test

mobile/test/medium/repositories/metadata_repository_test.dart

@@ -135,4 +135,5 @@ void main() {
       await expectation;
     });
   });
+
 }

mobile/test/unit/repositories/metadata_repository_test.dart

@@ -0,0 +1,15 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:immich_mobile/domain/models/metadata_key.dart';
+import 'package:immich_mobile/infrastructure/repositories/metadata.repository.dart';
+
+void main() {
+  group('codec', () {
+    test('every MetadataKey encodes and decodes values losslessly', () {
+      for (final key in MetadataKey.values) {
+        final encoded = MetadataRepository.encode(key.defaultValue);
+        final decoded = MetadataRepository.decode(key, encoded);
+        expect(decoded, key.defaultValue, reason: 'codec round-trip failed for ${key.name}');
+      }
+    });
+  });
+}