code: def test_deleter2(self):
      # memory is freed when array2 is deleted, as tensor is consumed
      array = cupy.empty(10)
      tensor = array.toDlpack()
      assert '"dltensor"' in str(tensor)
      array2 = cupy.fromDlpack(tensor)
      assert '"used_dltensor"' in str(tensor)
      assert self.pool.n_free_blocks() == 0
      del array
      assert self.pool.n_free_blocks() == 0
      del array2
      assert self.pool.n_free_blocks() == 1
      del tensor
      assert self.pool.n_free_blocks() == 1
  
imports: import unittest
  import pytest
  import cupy
  from cupy import cuda
  from cupy import testing
label_desc: Use image node_id 4 for calling the TestDLTensorMemory obj's underlying member method code with example usage: obj.test_deleter2() without return types