code: def test_set_random_test_dir(self):
      tpu_test_wrapper.maybe_define_flags()
      tpu_test_wrapper.set_random_test_dir()
  
      self.assertStartsWith(
          flags.FLAGS.model_dir, "gs://example-bucket/tempfiles"
      )
      self.assertGreater(
          len(flags.FLAGS.model_dir),
          len("gs://example-bucket/tempfiles"),
      )
  
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 8 for calling the TPUTestWrapperTest obj's underlying member method code with example usage: obj.test_set_random_test_dir() without return types