diff --git a/tests/samples/slay-the-spire-like/grid-inventory.test.ts b/tests/samples/slay-the-spire-like/grid-inventory.test.ts
index 5d7ed1d..5ffecfa 100644
--- a/tests/samples/slay-the-spire-like/grid-inventory.test.ts
+++ b/tests/samples/slay-the-spire-like/grid-inventory.test.ts
@@ -16,7 +16,10 @@ import {
   type InventoryItem,
 } from "@/samples/slay-the-spire-like/system/grid-inventory";
 import { createItemIn } from "@/samples/slay-the-spire-like/system/grid-inventory/factory";
-import type { GameItemMeta } from "@/samples/slay-the-spire-like/system/grid-inventory/types";
+import type {
+  GameItem,
+  GameItemMeta,
+} from "@/samples/slay-the-spire-like/system/grid-inventory/types";
 import type {
   CardData,
   ItemData,
@@ -595,7 +598,10 @@ describe("grid-inventory", () => {
       const inv = createGridInventory<GameItemMeta>(6, 4);
 
       // Place first item manually at origin
-      const firstItem = createTestItem("existing", "oee");
+      const firstItem = createTestItem(
+        "existing",
+        "oee",
+      ) as unknown as GameItem;
       placeItem(inv, firstItem);
 
       const itemData = createTestItemData("shield", "盾牌", "o", "防御");