code: def test_pad_via_func(self, xp, dtype):
      def _padwithtens(vector, pad_width, iaxis, kwargs):
          vector[: pad_width[0]] = 10
          vector[-pad_width[1] :] = 10
  
      a = xp.arange(6, dtype=dtype).reshape(2, 3)
      a = xp.pad(a, 2, _padwithtens)
      return a
  
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 TestPadCustomFunction obj's underlying member method code with example usage: obj.test_pad_via_func(xp, dtype) and returns: a