code: def test_sunny_day_horiz_split(self):
      train_set, test_set = train_test_split(make_dataset(8, 10))
  
      assert verify_shape(train_set, 6, 10) and verify_shape(
          test_set, 2, 10
      ), "Wrong shapes: training set shape: ({}, {}); test set shape ({}, {})".format(
          len(train_set),
          len(train_set[0]),
          len(test_set),
          len(test_set[0]),
      )
  
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 6 for calling the TestClassTrainTestSplit obj's underlying member method code with example usage: obj.test_sunny_day_horiz_split() without return types