fix(topology): validate time and list missions

tests/test_topology_api.py

@@ -41,5 +41,40 @@ class TopologyApiServingTests(unittest.TestCase):
         )
 
 
+class TopologyApiQueryTests(unittest.TestCase):
+    @classmethod
+    def setUpClass(cls) -> None:
+        app = create_app()
+        app.config.update(TESTING=True)
+        cls.client = app.test_client()
+
+    def test_invalid_time_is_json_400(self) -> None:
+        response = self.client.get(
+            "/api/v1/bases/guanghan/snapshot?at=not-a-time"
+        )
+        self.assertEqual(response.status_code, 400)
+        self.assertEqual(response.get_json()["error"], "invalid_time")
+
+    def test_time_and_mission_preserve_context(self) -> None:
+        response = self.client.get(
+            "/api/v1/bases/guanghan/snapshot"
+            "?mission=GHC-01&at=2025-01-02T08:00:00%2B08:00"
+        )
+        self.assertEqual(response.status_code, 200)
+        query = response.get_json()["query"]
+        self.assertEqual(query["requestedMission"], "GHC-01")
+        self.assertEqual(query["anchorSource"], "explicit_time")
+
+    def test_mission_list_is_database_backed(self) -> None:
+        response = self.client.get("/api/v1/bases/guanghan/missions")
+        self.assertEqual(response.status_code, 200)
+        missions = response.get_json()["missions"]
+        self.assertIn("GHC-05", [mission["code"] for mission in missions])
+        for mission in missions:
+            self.assertIn("title", mission)
+            self.assertIn("occurrenceStatus", mission)
+            self.assertIn("lastEventAt", mission)
+
+
 if __name__ == "__main__":
     unittest.main()