docstr: Test seasonal structure creation for a few different scenarios.
docstr_tok: ["Test","seasonal","structure","creation","for","a","few","different","scenarios","."]
code: def test_create_seasonal_structure(self, start, end, freq, expected):
      """Test seasonal structure creation for a few different scenarios."""
      dates = pd.date_range(start, end, freq=freq)
      seasonal_structure = seasonality_util.create_seasonal_structure(
          frequency=freq, num_steps=len(dates)
      )
      for key, value in expected.items():
          self.assertEqual(value, seasonal_structure[key])
  
file_path: probability/tensorflow_probability/python/sts/internal/seasonality_util_test.py
imports: from absl.testing import parameterized
  import numpy
  import pandas
  from tensorflow_probability.python.internal import test_util
  from tensorflow_probability.python.sts.internal import seasonality_util
label_desc: Use image node_id 6 for calling the SeasonalityUtilsTest obj's underlying member method code with example usage: obj.test_create_seasonal_structure(start, end, freq, expected) without return types