class_docstr: Tests for DatasetAttribute.
docstr: Test that __str__ returns the string representation of the value
code: def test_str(self, val):
      """Test that __str__ returns the string representation of the value"""
  
      assert str(attribute(val)) == str(val)
  
imports: from copy import copy, deepcopy
  from typing import Any, Iterable, List
  import numpy
  import pytest
  from pennylane.data.attributes import DatasetArray, DatasetList, DatasetNone, DatasetOperator, DatasetScalar, DatasetSparseArray, DatasetString, DatasetTuple
  from pennylane.data.base.attribute import UNSET, AttributeInfo, DatasetAttribute, attribute, match_obj_type
  from pennylane.data.base.hdf5 import HDF5Group, create_group
label_desc: Use image node_id 6 for calling the TestAttribute obj's underlying member method code with example usage: obj.test_str(val) without return types