code: def test_horiz_split_last_index_test_set(self):
      train_set, test_set = train_test_split(make_dataset(8, 10))
  
imports: import pytest
  from darts.utils.model_selection import MODEL_AWARE, SIMPLE, train_test_split
  from darts.utils.timeseries_generation import constant_timeseries
label_desc: Use image node_id 11 for calling the TestClassTrainTestSplit obj's underlying member method code with example usage: obj.test_horiz_split_last_index_test_set() without return types