code: def test_pad_failure(self):
      for xp in (numpy, cupy):
          array = xp.array(self.array)
          with pytest.raises(ValueError):
              xp.pad(array, self.pad_width, self.mode, **self.kwargs)
  
imports: import unittest
  import warnings
  import numpy
  import pytest
  import cupy
  from cupy import testing
label_desc: Use image node_id 1 for calling the TestPadValueError obj's underlying member method code with example usage: obj.test_pad_failure() without return types