feat(tests): updated tests coverage to 66.5%

test/features/diets/models/diet_likes_model_test.dart

@@ -24,6 +24,18 @@ void main() {
       expect(model.totalLikes, 10);
       expect(model.isLiked, isTrue);
     });
+
+    test('toJson serializes DietLikesModel correctly', () {
+      const model = DietLikesModel(
+        totalLikes: 15,
+        isLiked: false,
+      );
+
+      final json = model.toJson();
+
+      expect(json['total_likers'], 15);
+      expect(json['is_liked'], false);
+    });
   });
 }