code: def test_hash(self):
      hash(self.stream)
      hash(cuda.Stream(True))
      hash(cuda.Stream(False))
      mapping = {cuda.Stream(): 1, cuda.Stream(): 2}
  
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 5 for calling the TestStream obj's underlying member method code with example usage: obj.test_hash() without return types