code: def test_cohort_serialization_single_value_method(self, method):
      cohort_filter_1 = CohortFilter(
          method=method, arg=[65], column="age"
      )
      cohort_1 = Cohort(name="Cohort New")
      cohort_1.add_cohort_filter(cohort_filter_1)
      json_str = cohort_1.to_json()
  
      assert "Cohort New" in json_str
      assert method in json_str
      assert "[65]" in json_str
      assert "age" in json_str
  
imports: import json
  import pandas
  import pytest
  from raiutils.cohort import ClassificationOutcomes, Cohort, CohortFilter, CohortFilterMethods, cohort_filter_json_converter
  from raiutils.exceptions import UserConfigValidationException
label_desc: Use image node_id 3 for calling the TestCohort obj's underlying member method code with example usage: obj.test_cohort_serialization_single_value_method(method) without return types