chore: add test

Author: Lash-L

tests/test_containers.py

@@ -1,5 +1,6 @@
 """Test cases for the containers module."""
 
+import copy
 from dataclasses import dataclass
 from typing import Any
 
@@ -481,3 +482,14 @@ def test_multi_maps_list_info(snapshot: SnapshotAssertion) -> None:
     deserialized = MultiMapsList.from_dict(data)
     assert isinstance(deserialized, MultiMapsList)
     assert deserialized == snapshot
+
+
+def test_accurate_map_flag() -> None:
+    """Test that we parse the map flag accurately."""
+    s = S7MaxVStatus.from_dict(STATUS)
+    assert s.current_map == 0
+    status = copy.deepcopy(STATUS)
+    # 252 is a code for no map, it should end up being 63.
+    status["map_status"] = 252
+    s = S7MaxVStatus.from_dict(status)
+    assert s.current_map == 63