diff --git a/test/testGameItemMall.ts b/test/testGameItemMall.ts
index 35587d7..5702bc7 100644
--- a/test/testGameItemMall.ts
+++ b/test/testGameItemMall.ts
@@ -78,7 +78,9 @@ describe('GameItemMall', function() {
       )
        */
       //@ts-ignore
-      await mall.connect(otherAccount).buy(otherAccount.address, orderId, ft.target, amount, now, nonce, signature);
+      await expect(mall.connect(otherAccount).buy(otherAccount.address, orderId, ft.target, amount, now, nonce, signature))
+        .to.emit(mall, "ItemSoldOut")
+        .withArgs(otherAccount.address, otherAccount.address, orderId, ft.target, amount);
       expect(await ft.balanceOf(otherAccount.address)).to.equal(900);
     });