feat(map): derive station regions from GPS

vehicle-map/tests/test_server.py

@@ -1,5 +1,6 @@
 import importlib.util
 from pathlib import Path
+import tempfile
 import unittest
 from unittest.mock import patch
 
@@ -59,5 +60,30 @@ class DashboardTest(unittest.TestCase):
         self.assertEqual(calls, ["load"])
         self.assertEqual(first, second)
 
+    def test_station_region_comes_from_gps_reverse_geocode_and_persists_by_coordinate(self):
+        station = {
+            "longitude": 113.200001,
+            "latitude": 23.100001,
+            "province": "错误省份",
+            "city": "错误城市",
+            "district": "错误区县",
+        }
+        with tempfile.TemporaryDirectory() as directory:
+            cache_path = Path(directory) / "station-geocode.json"
+            with patch.object(server, "STATION_GEOCODE_CACHE_PATH", cache_path), \
+                 patch.object(server, "_station_geocode_cache", None), \
+                 patch.object(server, "_station_geocode_cache_dirty", False), \
+                 patch.object(server, "_reverse_geocode_station", return_value={
+                     "province": "广东省", "city": "广州市", "district": "黄埔区", "adcode": "440112"
+                 }) as reverse:
+                first = server._stations_with_gps_regions([station])[0]
+                second = server._stations_with_gps_regions([dict(station, province="仍然错误")])[0]
+            self.assertEqual(first["province"], "广东省")
+            self.assertEqual(first["city"], "广州市")
+            self.assertEqual(first["district"], "黄埔区")
+            self.assertEqual(second["province"], "广东省")
+            self.assertEqual(reverse.call_count, 1)
+            self.assertTrue(cache_path.exists())
+
 if __name__ == "__main__":
     unittest.main()