code: def test_del(self):
      null = self.stream == cuda.Stream.null
      if cuda.runtime.is_hip:
          ptds = False
      else:
          ptds = self.stream == cuda.Stream.ptds
  
      self.check_del(null=null, ptds=ptds)
  
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 8 for calling the TestStream obj's underlying member method code with example usage: obj.test_del() without return types