code: def test_keys(self, keys, expected):
      transform = MapTest(keys=keys)
      self.assertEqual(transform.keys, expected)
  
file_path: MONAI/tests/test_map_transform.py
imports: from __future__ import annotations
  import unittest
  from parameterized import parameterized
  from monai.transforms import MapTransform
label_desc: Use image node_id 1 for calling the TestRandomizable obj's underlying member method code with example usage: obj.test_keys(keys, expected) without return types