code: def test_is_test_class_negative(self):
      class A(object):
          pass
  
      self.assertFalse(tpu_test_wrapper._is_test_class(A))
  
imports: import importlib.util
  import os
  from absl.testing import flagsaver
  from tensorflow.python.platform import flags
  from tensorflow.python.platform import test
  from tensorflow.python.tpu import tpu_test_wrapper
label_desc: Use image node_id 6 for calling the TPUTestWrapperTest obj's underlying member method code with example usage: obj.test_is_test_class_negative() without return types