code: def test_simple_vertical_split_test_size_too_large(self):
      with pytest.raises(AttributeError) as err:
          train_set, test_set = train_test_split(
              make_dataset(4, 10),
              axis=1,
              vertical_split_type=SIMPLE,
              test_size=11,
          )
      assert (
          str(err.value)
          == "`test_size` is bigger then timeseries length"
      )
  
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 24 for calling the TestClassTrainTestSplit obj's underlying member method code with example usage: obj.test_simple_vertical_split_test_size_too_large() without return types