code: def test_is_test_class_positive(self):
      class A(test.TestCase):
          pass
  
      self.assertTrue(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 5 for calling the TPUTestWrapperTest obj's underlying member method code with example usage: obj.test_is_test_class_positive() without return types