diff --git a/apps/api/tests/test_smart_router.py b/apps/api/tests/test_smart_router.py
index 49351438..892b63ce 100644
--- a/apps/api/tests/test_smart_router.py
+++ b/apps/api/tests/test_smart_router.py
@@ -157,14 +157,16 @@ class TestAIRouter:
     """測試 AI 路由器"""
 
     def test_query_routes_to_ollama(self):
-        """測試查詢路由到 Ollama"""
+        """測試查詢路由到 Nemotron（Phase 25 P0: DIAGNOSE 升級至 Nemotron）"""
         router = AIRouter()
 
         decision = router.route_sync("查詢 Pod 狀態", {})
-        # DIAGNOSE 意圖 → Ollama
+        # DIAGNOSE 意圖 → Nemotron (P0 升級)
         assert decision.intent == IntentType.DIAGNOSE
         assert decision.model is not None
-        assert len(decision.fallback_models) >= 2
+        # DIAGNOSE 使用 _local_fallback_chain [NEMOTRON, OLLAMA]
+        # 選了 NEMOTRON 後，fallback 只剩 OLLAMA 一個 — 此為正確的隱私邊界設計
+        assert len(decision.fallback_models) >= 1
 
     def test_alert_intent_classification(self):
         """測試告警意圖分類"""