code: def test_args_string_default():
      assert IsIn().get_args_string() == ""
  
file_path: featuretools/featuretools/tests/primitive_tests/test_primitive_base.py
imports: from datetime import datetime
  import numpy
  import pandas
  from pytest import raises
  from featuretools.primitives import Haversine, IsIn, IsNull, Max, TimeSinceLast
  from featuretools.primitives.base import TransformPrimitive
label_desc: Use image node_id 8 for calling a global function with example usage: test_args_string_default() without return types