diff --git a/extensions/byteplus/video-generation-provider.test.ts b/extensions/byteplus/video-generation-provider.test.ts
index a2659acaa98..72daab0f9c6 100644
--- a/extensions/byteplus/video-generation-provider.test.ts
+++ b/extensions/byteplus/video-generation-provider.test.ts
@@ -63,7 +63,11 @@ describe("byteplus video generation provider", () => {
       }),
     );
     expect(result.videos).toHaveLength(1);
-    expect(result.videos[0]?.fileName).toBe("video-1.webm");
+    const [video] = result.videos;
+    if (!video) {
+      throw new Error("Expected generated BytePlus video");
+    }
+    expect(video.fileName).toBe("video-1.webm");
     expect(result.metadata).toEqual(
       expect.objectContaining({
         taskId: "task_123",