diff --git a/server-rs/crates/api-server/src/app.rs b/server-rs/crates/api-server/src/app.rs
index 27b0752a4..fd439acc6 100644
--- a/server-rs/crates/api-server/src/app.rs
+++ b/server-rs/crates/api-server/src/app.rs
@@ -6235,8 +6235,16 @@ mod tests {
             .expect("后台定价必须返回版本");
         let mut model3d = before["model3d"].clone();
         assert!(!model3d.is_null(), "默认定价必须带 3D 两段");
-        model3d["textToModelPricing"]["addOnPrices"]["quadMesh"] = Value::Number(9.into());
-        model3d["imageToModelPricing"]["versionPrices"]["P2-20260801"]["texture"] =
+        // 先按路径读到目标键再改：`Value::index_mut` 在键缺失时直接 panic，默认定价
+        // 一旦换版本号或重命名键，只会看到一个没有上下文的 panic。先断言存在，
+        // fixture 漂移时就能看清是哪一层对不上。
+        *model3d
+            .pointer_mut("/textToModelPricing/addOnPrices/quadMesh")
+            .expect("默认定价必须带 textToModelPricing.addOnPrices.quadMesh") =
+            Value::Number(9.into());
+        *model3d
+            .pointer_mut("/imageToModelPricing/versionPrices/P2-20260801/texture")
+            .expect("默认定价必须带 imageToModelPricing.versionPrices.P2-20260801.texture") =
             Value::Number(99.into());
 
         let response = save_admin_editor_generation_pricing(