code: def test_periods_per_year(self, frequency, expected_periods_per_year):
      self.assertEqual(
          seasonality_util.periods_per_year(frequency),
          expected_periods_per_year,
      )
  
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 1 for calling the SeasonalityUtilsTest obj's underlying member method code with example usage: obj.test_periods_per_year(frequency, expected_periods_per_year) without return types