完善权限缓存与监控指标

backend/tests/test_permission_monitoring.py

@@ -17,6 +17,7 @@ from app.core.permission_monitor import (
     CacheMetrics,
     get_permission_monitor,
     set_permission_monitor,
+    evaluate_permission_system_health,
 )
 
 
@@ -312,3 +313,28 @@ async def test_cache_metrics_dataclass():
 
     assert metrics.hit_rate == pytest.approx(80.0, 0.1)
     assert metrics.miss_rate == pytest.approx(20.0, 0.1)
+
+
+@pytest.mark.asyncio
+async def test_health_check_ignores_cache_hit_rate_without_samples():
+    """没有缓存访问样本时，不应判定缓存命中率过低"""
+    monitor = PermissionMonitor()
+    metrics = monitor.get_metrics()
+    cache_stats = monitor.get_cache_stats()
+
+    health = evaluate_permission_system_health(metrics, cache_stats)
+
+    assert metrics["cache_metrics"]["total_accesses"] == 0
+    assert "缓存命中率过低" not in health["issues"]
+
+
+@pytest.mark.asyncio
+async def test_health_check_ignores_cache_hit_rate_with_too_few_samples():
+    """缓存访问样本过少时，不应判定缓存命中率过低"""
+    monitor = PermissionMonitor()
+    for _ in range(3):
+        monitor.record_cache_miss()
+
+    health = evaluate_permission_system_health(monitor.get_metrics(), monitor.get_cache_stats())
+
+    assert "缓存命中率过低" not in health["issues"]