code: def test_properties(self) -> None:
      self.assertEqual(self.mmd.map_key_infos, self.map_key_infos)
      self.assertEqual(self.mmd.map_keys, ["epoch"])
      self.assertEqual(self.mmd.map_key_to_type, {"epoch": int})
  
file_path: Ax/ax/core/tests/test_map_data.py
imports: import pandas
  from ax.core.data import Data
  from ax.core.map_data import MapData, MapKeyInfo
  from ax.utils.common.testutils import TestCase
label_desc: Use image node_id 4 for calling the MapDataTest obj's underlying member method code with example usage: obj.test_properties() without return types