code: def test_mapper(self):
      test_cases = [
          (self.zeroes, self.tens),
          ([self.zeroes, self.tens], [self.tens, self.twenties]),
      ]
  
      for to_transform, expected_output in test_cases:
          transformed = self.plus_ten.transform(to_transform)
          assert transformed == expected_output
  
file_path: darts/darts/tests/dataprocessing/transformers/test_mappers.py
imports: import numpy
  import pandas
  from darts import TimeSeries
  from darts.dataprocessing.transformers.mappers import InvertibleMapper, Mapper
  from darts.utils.timeseries_generation import constant_timeseries, linear_timeseries
label_desc: Use image node_id 5 for calling the TestMappers obj's underlying member method code with example usage: obj.test_mapper() without return types