code: def test_trend_adjust_method_enum():
      """Tests the trend adjust method Enum."""
      assert (
          TrendAdjustMethodEnum.seasonal_average.value
          == "seasonal_average"
      )
      assert (
          TrendAdjustMethodEnum.overall_average.value
          == "overall_average"
      )
      assert TrendAdjustMethodEnum.spline_fit.value == "spline_fit"
  
file_path: greykite/greykite/tests/algo/common/test_seasonality_inferrer.py
imports: from copy import deepcopy
  import pandas
  import pytest
  from greykite.algo.common.seasonality_inferrer import SeasonalityInferConfig
  from greykite.algo.common.seasonality_inferrer import SeasonalityInferrer
  from greykite.algo.common.seasonality_inferrer import TrendAdjustMethodEnum
  from greykite.common import constants
  from greykite.common.testing_utils import assert_equal
  from greykite.common.testing_utils import generate_df_for_tests
  from greykite.common.time_properties import infer_freq
label_desc: Use image node_id 3 for calling a global function with example usage: test_trend_adjust_method_enum() without return types