code: def test_stream(self):
      allowed_streams = ["null", True]
      if not cuda.runtime.is_hip:
          allowed_streams.append("ptds")
  
      # stream order is automatically established via DLPack protocol
      for src_s in [self._get_stream(s) for s in allowed_streams]:
          for dst_s in [self._get_stream(s) for s in allowed_streams]:
              with src_s:
                  orig_array = _gen_array(cupy.float32)
                  # If src_s != dst_s, dst_s waits until src_s complete.
                  # Null stream (0) must be passed as streamLegacy (1)
                  # on CUDA.
                  if not cuda.runtime.is_hip and dst_s.ptr == 0:
                      s_ptr = 1
                  else:
                      s_ptr = dst_s.ptr
                  dltensor = orig_array.__dlpack__(stream=s_ptr)
  
              with dst_s:
                  out_array = cupy.from_dlpack(dltensor)
                  testing.assert_array_equal(orig_array, out_array)
                  testing.assert_array_equal(
                      orig_array.data.ptr, out_array.data.ptr
                  )
  
imports: import unittest
  import pytest
  import cupy
  from cupy import cuda
  from cupy import testing
label_desc: Use image node_id 5 for calling the TestNewDLPackConversion obj's underlying member method code with example usage: obj.test_stream() without return types