code: def test_test_split_absolute_number_horiz(self):
      train_set, test_set = train_test_split(
          make_dataset(4, 10), axis=0, test_size=2
      )
  
      assert verify_shape(train_set, 2, 10) and verify_shape(
          test_set, 2, 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 13 for calling the TestClassTrainTestSplit obj's underlying member method code with example usage: obj.test_test_split_absolute_number_horiz() without return types