code: def test_inverse_transform_HaveRegexMetacharactersInColumnName_ExpectInversed(
      self,
  ):
      train = pd.DataFrame(
          {"state (2-letter code)": ["il", "ny", "ca"]}
      )
  
      enc = encoders.BaseNEncoder()
      enc.fit(train)
      result = enc.transform(train)
      original = enc.inverse_transform(result)
  
      pd.testing.assert_frame_equal(train, original)
  
imports: import pandas
  from unittest import TestCase
  import numpy
  import category_encoders
label_desc: Use image node_id 13 for calling the TestBaseNEncoder obj's underlying member method code with example usage: obj.test_inverse_transform_HaveRegexMetacharactersInColumnName_ExpectInversed() without return types