diff --git a/extensions/feishu/src/docx-batch-insert.test.ts b/extensions/feishu/src/docx-batch-insert.test.ts
index 2b3f9f39db0..a2177744538 100644
--- a/extensions/feishu/src/docx-batch-insert.test.ts
+++ b/extensions/feishu/src/docx-batch-insert.test.ts
@@ -31,6 +31,20 @@ function createCountingIterable<T>(values: T[]) {
   };
 }
 
+function createSuccessfulDocxDescendantCreateMock() {
+  return vi.fn(
+    async (params?: DocxDescendantCreateParams): Promise<DocxDescendantCreateResponse> => ({
+      code: 0,
+      data: {
+        children: (params?.data?.children_id ?? []).map((id) => ({
+          block_id: id,
+          block_type: 2,
+        })),
+      },
+    }),
+  );
+}
+
 describe("insertBlocksInBatches", () => {
   it("builds the source block map once for large flat trees", async () => {
     const blockCount = BATCH_SIZE + 200;
@@ -39,17 +53,7 @@ describe("insertBlocksInBatches", () => {
       block_type: 2,
     }));
     const counting = createCountingIterable(blocks);
-    const createMock = vi.fn(
-      async (params?: DocxDescendantCreateParams): Promise<DocxDescendantCreateResponse> => ({
-        code: 0,
-        data: {
-          children: (params?.data?.children_id ?? []).map((id) => ({
-            block_id: id,
-            block_type: 2,
-          })),
-        },
-      }),
-    );
+    const createMock = createSuccessfulDocxDescendantCreateMock();
     const client = createDocxDescendantClient((params) => createMock(params));
 
     const result = await insertBlocksInBatches(
@@ -67,17 +71,7 @@ describe("insertBlocksInBatches", () => {
   });
 
   it("keeps nested descendants grouped with their root blocks", async () => {
-    const createMock = vi.fn(
-      async (params?: DocxDescendantCreateParams): Promise<DocxDescendantCreateResponse> => ({
-        code: 0,
-        data: {
-          children: (params?.data?.children_id ?? []).map((id) => ({
-            block_id: id,
-            block_type: 2,
-          })),
-        },
-      }),
-    );
+    const createMock = createSuccessfulDocxDescendantCreateMock();
     const client = createDocxDescendantClient((params) => createMock(params));
     const blocks: FeishuDocxBlock[] = [
       { block_id: "root_a", block_type: 1, children: ["child_a"] },