test: harden business boundary conditions

apps/server/src/integration/dingtalk.service.spec.ts

@@ -174,3 +174,41 @@ describe('DingTalkService — attendance machine only group', () => {
     }));
   });
 });
+
+describe('DingTalkService — department user pagination boundaries', () => {
+  afterEach(() => {
+    jest.restoreAllMocks();
+    global.fetch = undefined as unknown as typeof fetch;
+  });
+
+  it('stops when DingTalk says there is another page but omits the next cursor', async () => {
+    const service = new DingTalkService({} as never, {} as never);
+    global.fetch = jest.fn().mockResolvedValue({
+      json: jest.fn().mockResolvedValue({
+        errcode: 0,
+        errmsg: 'ok',
+        result: {
+          list: [{ userid: 'u1', name: 'Alice', mobile: '', dept_id_list: [1] }],
+          has_more: true,
+        },
+      }),
+    }) as jest.MockedFunction<typeof fetch>;
+
+    await expect((service as any).getDeptUsers('token', 1)).resolves.toHaveLength(1);
+    expect(global.fetch).toHaveBeenCalledTimes(1);
+  });
+
+  it('stops when the next cursor repeats the current cursor', async () => {
+    const service = new DingTalkService({} as never, {} as never);
+    global.fetch = jest.fn().mockResolvedValue({
+      json: jest.fn().mockResolvedValue({
+        errcode: 0,
+        errmsg: 'ok',
+        result: { list: [], has_more: true, next_cursor: 0 },
+      }),
+    }) as jest.MockedFunction<typeof fetch>;
+
+    await expect((service as any).getDeptUsers('token', 1)).resolves.toEqual([]);
+    expect(global.fetch).toHaveBeenCalledTimes(1);
+  });
+});