diff --git a/extensions/bonjour/src/advertiser.test.ts b/extensions/bonjour/src/advertiser.test.ts
index 7744c73f947..a1bfed5b018 100644
--- a/extensions/bonjour/src/advertiser.test.ts
+++ b/extensions/bonjour/src/advertiser.test.ts
@@ -290,8 +290,11 @@ describe("gateway bonjour advertiser", () => {
 
       await started.stop();
       childProcessModule.exec('arp -a | findstr /C:"---"', () => {});
-      const afterStopOptions = execMock.mock.calls.at(-1)?.[1];
-      expect(afterStopOptions).toEqual(expect.any(Function));
+      const afterStopCallback = execMock.mock.calls.at(-1)?.[1];
+      if (typeof afterStopCallback !== "function") {
+        throw new Error("expected restored exec callback overload");
+      }
+      afterStopCallback(null, "", "");
     } finally {
       childProcessModule.exec = originalExec;
     }
diff --git a/extensions/telegram/src/bot.test.ts b/extensions/telegram/src/bot.test.ts
index c37941a2633..b2f21680867 100644
--- a/extensions/telegram/src/bot.test.ts
+++ b/extensions/telegram/src/bot.test.ts
@@ -2638,7 +2638,9 @@ describe("createTelegramBot", () => {
     createTelegramBot({ token: "tok" });
     const reactionHandler = onSpy.mock.calls.find((call) => call[0] === "message_reaction");
     expect(reactionHandler?.[0]).toBe("message_reaction");
-    expect(reactionHandler?.[1]).toEqual(expect.any(Function));
+    if (typeof reactionHandler?.[1] !== "function") {
+      throw new Error("expected message_reaction handler");
+    }
   });
 
   it("enqueues system event for reaction", async () => {
diff --git a/extensions/voice-call/src/webhook/realtime-handler.test.ts b/extensions/voice-call/src/webhook/realtime-handler.test.ts
index 8220ff6a59c..bf26d206773 100644
--- a/extensions/voice-call/src/webhook/realtime-handler.test.ts
+++ b/extensions/voice-call/src/webhook/realtime-handler.test.ts
@@ -1206,13 +1206,16 @@ describe("RealtimeCallHandler websocket hardening", () => {
           }),
         );
         await vi.waitFor(() => {
-          expect(sendProviderAudio).toEqual(expect.any(Function));
+          if (!sendProviderAudio) {
+            throw new Error("expected realtime provider audio sender");
+          }
         });
 
-        if (!sendProviderAudio) {
+        const providerAudioSender = sendProviderAudio;
+        if (!providerAudioSender) {
           throw new Error("expected realtime provider audio sender");
         }
-        sendProviderAudio(Buffer.alloc(8_000 * 121, 0x7f));
+        providerAudioSender(Buffer.alloc(8_000 * 121, 0x7f));
         const closed = await waitForClose(ws);
 
         expect(closed.code).toBe(1013);