code: def test_experimental_with_no_api_name_2(self):
      with warnings.catch_warnings(record=True) as w:
          warnings.simplefilter("always")
          C()
  
      self.assertEqual(len(w), 1)
      self.assertIs(w[0].category, FutureWarning)
      self.assertIn("C is experimental.", str(w[0].message))
  
imports: import unittest
  import warnings
  import chainer
  from chainer import testing
  from chainer import utils
label_desc: Use image node_id 4 for calling the TestExperimental obj's underlying member method code with example usage: obj.test_experimental_with_no_api_name_2() without return types