code: def test_singular():
      assert Timedelta.make_singular("Month") == "Month"
      assert Timedelta.make_singular("Months") == "Month"
  
imports: import pandas
  import pytest
  from dateutil.relativedelta import relativedelta
  from featuretools.entityset import Timedelta
  from featuretools.feature_base import Feature
  from featuretools.primitives import Count
  from featuretools.tests.testing_utils import to_pandas
  from featuretools.utils.wrangle import _check_timedelta
label_desc: Use image node_id 2 for calling a global function with example usage: test_singular() without return types