code: def test_validate_varlen_sparse_value(self, value, error=None):
      if error is None:
          self.assertIsNone(
              impl_helper.validate_varlen_sparse_value("varlen", value)
          )
      else:
          with self.assertRaisesRegex(ValueError, error):
              impl_helper.validate_varlen_sparse_value("varlen", value)
  
imports: import copy
  import os
  import numpy
  from packaging import version
  import pyarrow
  import tensorflow
  from tensorflow_transform import analyzers
  from tensorflow_transform import impl_helper
  from tensorflow_transform import schema_inference
  from tensorflow_transform import test_case
  from tensorflow_transform.output_wrapper import TFTransformOutput
  from tensorflow_transform.tf_metadata import schema_utils
label_desc: Use image node_id 11 for calling the ImplHelperTest obj's underlying member method code with example usage: obj.test_validate_varlen_sparse_value(value, error) without return types