code: def test_HandleMissingValue_HaveMissingInTrain_ExpectEncoded(self):
      X = ["a", "a", np.nan, np.nan]
      y = [1, 0, 0, 0]
      enc = encoders.WOEEncoder(handle_missing="value")
  
      result = enc.fit_transform(X, y)
  
      expected = pd.Series(
          [
              0.5108256237659906,
              0.5108256237659906,
              -0.587786664902119,
              -0.587786664902119,
          ],
          name=0,
      )
      pd.testing.assert_series_equal(expected, result[0])
  
file_path: category_encoders/tests/test_woe.py
imports: import pandas
  from unittest import TestCase
  import tests.helpers
  import numpy
  import category_encoders
label_desc: Use image node_id 3 for calling the TestWeightOfEvidenceEncoder obj's underlying member method code with example usage: obj.test_HandleMissingValue_HaveMissingInTrain_ExpectEncoded() without return types