code: def test_inf(self, xp, dtype):
      def func(x):
          x[:] = cupy.inf
          return x
  
      return func
  
imports: import threading
  import unittest
  from unittest import mock
  import pytest
  import cupy
  from cupy import testing
  from cupy_tests.core_tests.fusion_tests import fusion_utils
label_desc: Use image node_id 2 for calling the TestSpecialValues obj's underlying member method code with example usage: obj.test_inf(xp, dtype) and returns: func, x