code: def test_wrong_value(self):
      # nonsense strings
      self._check_value_error("")
      self._check_value_error("\N{greek small letter pi}")
  
      if self.allow_bytes:
          self._check_value_error(b"")
          # bytes which can't be converted to strings via utf8
          self._check_value_error(b"\xFF")
      if self.exact_match:
          self._check_value_error("there's no way this is supported")
  
imports: import re
  import sys
  import pytest
  import numpy
  import numpy.core._multiarray_tests
  from numpy.testing import assert_warns, IS_PYPY
label_desc: Use image node_id 5 for calling the StringConverterTestCase obj's underlying member method code with example usage: obj.test_wrong_value() without return types