code: def setUp(self):
      if cuda.runtime.is_hip and self.stream_name == "ptds":
          self.skipTest("HIP does not support PTDS")
  
      self._prev_stream = cuda.get_current_stream()
  
      if self.stream_name == "null":
          self.stream = cuda.Stream.null
      elif self.stream_name == "ptds":
          self.stream = cuda.Stream.ptds
      self.stream.use()
  
imports: import gc
  import threading
  import unittest
  import pytest
  import cupy
  from cupy._creation import from_data
  from cupy import cuda
  from cupy import testing
label_desc: Use image node_id 1 for calling the TestStream obj's underlying member method code with example usage: obj.setUp() without return types