diff --git a/yunke-server/tests/test_api_moments.py b/yunke-server/tests/test_api_moments.py
index 0e238a6..a4f5770 100644
--- a/yunke-server/tests/test_api_moments.py
+++ b/yunke-server/tests/test_api_moments.py
@@ -77,3 +77,28 @@ async def test_moments_pagination(make_client):
     assert b1["total"] == b2["total"] == 3
     # alias 非空时映射到 header(列直读)
     assert b1["header"]["alias"] == "al_o"
+
+
+async def test_moments_same_create_time_tiebreak_id_asc(make_client):
+    """同 create_time(秒级来源×1000 必然同值)→ 按 id 升序稳定排列。
+
+    锁死分页稳定契约:tie-break 缺失会让同秒帖跨页漂移(每页 offset 重查
+    时顺序抖动 → 重复/丢帖)。任务 6 评审遗留补测。
+    """
+
+    async def seed(s: AsyncSession):
+        s.add(WechatAccount(wx_id=STAFF, nick_name="员工昵称"))
+        s.add_all([
+            MomentsPost(id="pz", wechat_id=STAFF, create_time=200, content="z"),
+            MomentsPost(id="pa", wechat_id=STAFF, create_time=200, content="a"),
+            MomentsPost(id="pb", wechat_id=STAFF, create_time=200, content="b"),
+        ])
+        await s.commit()
+
+    client = await make_client(seed)
+    b1 = (await client.get("/api/moments", params={"wechat_id": STAFF, "page": 1, "page_size": 2})).json()
+    b2 = (await client.get("/api/moments", params={"wechat_id": STAFF, "page": 2, "page_size": 2})).json()
+    # create_time desc 全并列 → id 升序断尾:pa, pb | pz
+    assert [p["id"] for p in b1["items"]] == ["pa", "pb"]
+    assert [p["id"] for p in b2["items"]] == ["pz"]
+    assert b1["total"] == b2["total"] == 3