code: def test_HaveNegativeOneInTrain_ExpectCodedAsOne(self):
      train = pd.DataFrame({"city": [-1]})
      expected = [1]
  
      enc = encoders.OrdinalEncoder(cols=["city"])
      result = enc.fit_transform(train)["city"].tolist()
  
      self.assertEqual(expected, result)
  
imports: import pandas
  from unittest import TestCase
  import tests.helpers
  import numpy
  import category_encoders
label_desc: Use image node_id 9 for calling the TestOrdinalEncoder obj's underlying member method code with example usage: obj.test_HaveNegativeOneInTrain_ExpectCodedAsOne() without return types