test(feishu): add regression for audio download resource type=file (openclaw#16311) thanks @Yaxuan42

Verified:
- pnpm build
- pnpm check
- pnpm vitest run --config vitest.extensions.config.ts extensions/feishu/src/bot.test.ts extensions/feishu/src/media.test.ts

Co-authored-by: Yaxuan42 <184813557+Yaxuan42@users.noreply.github.com>
Co-authored-by: Tak Hoffman <781889+Takhoffman@users.noreply.github.com>

extensions/feishu/src/bot.test.ts

@@ -1,7 +1,7 @@
 import type { ClawdbotConfig, PluginRuntime, RuntimeEnv } from "openclaw/plugin-sdk";
 import { beforeEach, describe, expect, it, vi } from "vitest";
 import type { FeishuMessageEvent } from "./bot.js";
-import { buildFeishuAgentBody, handleFeishuMessage } from "./bot.js";
+import { buildFeishuAgentBody, handleFeishuMessage, toMessageResourceType } from "./bot.js";
 import { setFeishuRuntime } from "./runtime.js";
 
 const {
@@ -993,3 +993,19 @@ describe("handleFeishuMessage command authorization", () => {
     );
   });
 });
+
+describe("toMessageResourceType", () => {
+  it("maps image to image", () => {
+    expect(toMessageResourceType("image")).toBe("image");
+  });
+
+  it("maps audio to file", () => {
+    expect(toMessageResourceType("audio")).toBe("file");
+  });
+
+  it("maps video/file/sticker to file", () => {
+    expect(toMessageResourceType("video")).toBe("file");
+    expect(toMessageResourceType("file")).toBe("file");
+    expect(toMessageResourceType("sticker")).toBe("file");
+  });
+});