功能：完善加氢站导航详情与缓存刷新

station-navigation/tests/test_server.py

@@ -2,6 +2,8 @@ import importlib.util
 import io
 import json
 from pathlib import Path
+import threading
+import time
 import unittest
 from unittest.mock import patch
 
@@ -49,6 +51,29 @@ class StationNavigationTest(unittest.TestCase):
         self.assertEqual(calls, ["load"])
         self.assertEqual(first, second)
 
+    def test_expired_directory_returns_stale_value_while_refreshing_in_background(self):
+        started = threading.Event()
+        release = threading.Event()
+
+        def loader():
+            started.set()
+            release.wait(1)
+            return {"version": 2}
+
+        cache = {"station-directory": (time.time() - 121, {"version": 1})}
+        with patch.object(server, "_cache", cache), \
+             patch.object(server, "_cache_refreshing", set()), \
+             patch.object(server, "_cache_load_locks", {}):
+            result = server._cached("station-directory", 120, loader)
+            self.assertEqual(result, {"version": 1})
+            self.assertTrue(started.wait(1))
+            release.set()
+            for _ in range(100):
+                if cache["station-directory"][1] == {"version": 2}:
+                    break
+                time.sleep(0.01)
+        self.assertEqual(cache["station-directory"][1], {"version": 2})
+
 
 if __name__ == "__main__":
     unittest.main()