diff --git a/extensions/feishu/src/bot.test.ts b/extensions/feishu/src/bot.test.ts
index 813110378c3f..9ece817b30ea 100644
--- a/extensions/feishu/src/bot.test.ts
+++ b/extensions/feishu/src/bot.test.ts
@@ -241,8 +241,10 @@ function mockCallArg<T>(
   _type?: (value: unknown) => value is T,
 ): T {
   const call = mock.mock.calls[callIndex];
-  expect(call).toBeDefined();
-  return call?.[argIndex] as T;
+  if (!call) {
+    throw new Error(`Expected mock call at index ${callIndex}`);
+  }
+  return call[argIndex] as T;
 }
 
 type FeishuRoutePeer = { id: string; kind: "direct" | "group" };
diff --git a/extensions/feishu/src/comment-dispatcher.test.ts b/extensions/feishu/src/comment-dispatcher.test.ts
index de7f4783c61d..8c2521f70112 100644
--- a/extensions/feishu/src/comment-dispatcher.test.ts
+++ b/extensions/feishu/src/comment-dispatcher.test.ts
@@ -149,7 +149,9 @@ describe("createFeishuCommentReplyDispatcher", () => {
 
     expect(status).toBe("done");
     const client = createFeishuClientMock.mock.results[0]?.value;
-    expect(client).toBeDefined();
+    if (!client) {
+      throw new Error("Expected Feishu client");
+    }
     expect(deliverCommentThreadTextMock).toHaveBeenCalledWith(client, {
       file_token: "doc_token_1",
       file_type: "docx",
diff --git a/extensions/feishu/src/docx.test.ts b/extensions/feishu/src/docx.test.ts
index b221c7131c29..36a063103742 100644
--- a/extensions/feishu/src/docx.test.ts
+++ b/extensions/feishu/src/docx.test.ts
@@ -72,8 +72,10 @@ function requireRecord(value: unknown, label: string): Record<string, unknown> {
 function callArg(mock: unknown, callIndex: number, argIndex: number, label: string) {
   const calls = (mock as { mock?: { calls?: Array<Array<unknown>> } }).mock?.calls ?? [];
   const call = calls.at(callIndex);
-  expect(call, label).toBeDefined();
-  return call?.[argIndex];
+  if (!call) {
+    throw new Error(`Expected ${label}`);
+  }
+  return call[argIndex];
 }
 
 function expectLoadWebMediaCall(fileName: string, localRoots: unknown[] | undefined) {
diff --git a/extensions/feishu/src/drive.test.ts b/extensions/feishu/src/drive.test.ts
index 2ab9c06929e2..ec030547c667 100644
--- a/extensions/feishu/src/drive.test.ts
+++ b/extensions/feishu/src/drive.test.ts
@@ -52,8 +52,10 @@ function mockCallArg<T>(
   _type?: (value: unknown) => value is T,
 ): T {
   const call = mock.mock.calls[callIndex];
-  expect(call).toBeDefined();
-  return call?.[argIndex] as T;
+  if (!call) {
+    throw new Error(`Expected mock call at index ${callIndex}`);
+  }
+  return call[argIndex] as T;
 }
 
 type FeishuDriveRequest = {
@@ -633,7 +635,9 @@ describe("registerFeishuDriveTools", () => {
       client?: unknown;
       deliveryContext?: { channel?: string; threadId?: string; to?: string };
     }>(cleanupAmbientCommentTypingReactionMock, 0, 0);
-    expect(cleanupRequest.client).toBeDefined();
+    if (!cleanupRequest.client) {
+      throw new Error("Expected cleanup request client");
+    }
     expect(cleanupRequest.deliveryContext).toEqual({
       channel: "feishu",
       to: "comment:docx:doc_1:c1",
@@ -707,7 +711,9 @@ describe("registerFeishuDriveTools", () => {
       client?: unknown;
       deliveryContext?: { channel?: string; threadId?: string; to?: string };
     }>(cleanupAmbientCommentTypingReactionMock, 0, 0);
-    expect(cleanupRequest.client).toBeDefined();
+    if (!cleanupRequest.client) {
+      throw new Error("Expected cleanup request client");
+    }
     expect(cleanupRequest.deliveryContext).toEqual({
       channel: "feishu",
       to: "comment:docx:doc_1:c1",
diff --git a/extensions/feishu/src/media.test.ts b/extensions/feishu/src/media.test.ts
index d3f3403dcfad..7a2471e74abb 100644
--- a/extensions/feishu/src/media.test.ts
+++ b/extensions/feishu/src/media.test.ts
@@ -91,8 +91,10 @@ function mockCallArg<T>(
   _type?: (value: unknown) => value is T,
 ): T {
   const call = mock.mock.calls[callIndex];
-  expect(call).toBeDefined();
-  return call?.[argIndex] as T;
+  if (!call) {
+    throw new Error(`Expected mock call at index ${callIndex}`);
+  }
+  return call[argIndex] as T;
 }
 
 function callData<T>(
@@ -101,7 +103,9 @@ function callData<T>(
   _type?: (value: unknown) => value is T,
 ): T {
   const arg = mockCallArg<{ data?: unknown }>(mock, callIndex, 0);
-  expect(arg.data).toBeDefined();
+  if (arg.data === undefined) {
+    throw new Error(`Expected mock call data at index ${callIndex}`);
+  }
   return arg.data as T;
 }
 
diff --git a/extensions/feishu/src/outbound.test.ts b/extensions/feishu/src/outbound.test.ts
index 70ba933b1ab4..3f1cc11d82d8 100644
--- a/extensions/feishu/src/outbound.test.ts
+++ b/extensions/feishu/src/outbound.test.ts
@@ -801,8 +801,11 @@ describe("feishuOutbound comment-thread routing", () => {
 
     expect(status).toBe("done");
     expect(deliverCommentThreadTextMock).toHaveBeenCalled();
-    expect(cleanupReactionCall()?.client).toBeDefined();
-    expect(cleanupReactionCall()?.deliveryContext).toEqual({
+    const cleanupCall = cleanupReactionCall();
+    if (!cleanupCall?.client) {
+      throw new Error("Expected cleanup reaction client");
+    }
+    expect(cleanupCall.deliveryContext).toEqual({
       channel: "feishu",
       to: "comment:docx:doxcn123:7623358762119646411",
       threadId: "reply_ambient_1",
diff --git a/extensions/feishu/src/reply-dispatcher.test.ts b/extensions/feishu/src/reply-dispatcher.test.ts
index edcc4e4bfaf3..eb29a139c012 100644
--- a/extensions/feishu/src/reply-dispatcher.test.ts
+++ b/extensions/feishu/src/reply-dispatcher.test.ts
@@ -245,7 +245,9 @@ describe("createFeishuReplyDispatcher streaming behavior", () => {
     expected: Record<string, unknown>,
   ): Record<string, unknown> {
     const start = streamingInstances[instanceIndex]?.start;
-    expect(start, "streaming instance must exist").toBeDefined();
+    if (!start) {
+      throw new Error(`Expected streaming instance ${instanceIndex}`);
+    }
     expect(start.mock.calls[0]?.[0]).toBe("oc_chat");
     expect(start.mock.calls[0]?.[1]).toBe("chat_id");
     return expectRecordFields(start.mock.calls[0]?.[2], "streaming start options", expected);