code: def test_arbitrary_element_raises(iterator):
      """Value error is raised when input is an iterator."""
      with pytest.raises(ValueError, match="from an iterator"):
          arbitrary_element(iterator)
  
imports: import random
  from copy import copy
  import pytest
  import networkx
  from networkx.utils import PythonRandomInterface, arbitrary_element, create_py_random_state, create_random_state, dict_to_numpy_array, discrete_sequence, flatten, groups, make_list_of_ints, pairwise, powerlaw_sequence
  from networkx.utils.misc import _dict_to_numpy_array1, _dict_to_numpy_array2
label_desc: Use image node_id 11 for calling a global function with example usage: test_arbitrary_element_raises(iterator) without return types