From 57214586a8915d83b680d1ca77def4381567e3ce Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E4=BE=9D=E7=91=AA=E8=B2=93?= <imacat@mail.imacat.idv.tw>
Date: Mon, 9 Mar 2026 14:20:21 +0800
Subject: [PATCH] Return empty string instead of undefined from getFileName on
 not-found

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
---
 src/stores/compare.ts        | 1 +
 tests/stores/compare.test.js | 4 ++--
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/stores/compare.ts b/src/stores/compare.ts
index cd8840e..c29a557 100644
--- a/src/stores/compare.ts
+++ b/src/stores/compare.ts
@@ -78,6 +78,7 @@ export const useCompareStore = defineStore("compareStore", {
       } catch (error) {
         apiError(error, "Failed to load the Compare's file name.");
       }
+      return "";
     },
   },
 });
diff --git a/tests/stores/compare.test.js b/tests/stores/compare.test.js
index a99cd87..33cdc86 100644
--- a/tests/stores/compare.test.js
+++ b/tests/stores/compare.test.js
@@ -93,14 +93,14 @@ describe("compareStore", () => {
       expect(result).toBe("file1.csv");
     });
 
-    it("returns undefined for non-existent id", async () => {
+    it("returns empty string for non-existent id", async () => {
       mockGet.mockResolvedValue({
         data: [{ id: 1, name: "file1.csv" }],
       });
 
       const result = await store.getFileName(99);
 
-      expect(result).toBeUndefined();
+      expect(result).toBe("");
     });
   });
 });