code: def test_add_method():
      chain = transform.AddTimeFeatures(
          start_field=FieldName.START,
          target_field=FieldName.TARGET,
          output_field="time_feat",
          time_features=[
              time_feature.day_of_week,
              time_feature.day_of_month,
              time_feature.month_of_year,
          ],
          pred_length=24,
      ) + transform.AddAgeFeature(
          target_field=FieldName.TARGET,
          output_field="age",
          pred_length=24,
          log_scale=True,
      )
  
      assert isinstance(chain, transform.Chain)
  
imports: from typing import Tuple, List
  import numpy
  import pandas
  from pandas.tseries.frequencies import to_offset
  import pytest
  import gluonts
  from gluonts import time_feature, transform
  from gluonts.core import fqname_for
  from gluonts.core.serde import dump_json, load_json
  from gluonts.dataset.common import DataEntry, ListDataset
  from gluonts.dataset.field_names import FieldName
  from gluonts.dataset.stat import ScaleHistogram, calculate_dataset_statistics
  from gluonts.transform import CausalMeanValueImputation, DummyValueImputation, LastValueImputation, MeanValueImputation, RollingMeanValueImputation, Valmap
  from gluonts.transform.convert import ToIntervalSizeFormat, erf, erfinv
  from gluonts.transform.feature import CountTrailingZeros
label_desc: Use image node_id 2 for calling a global function with example usage: test_add_method() without return types