code: def test_n_free_blocks_without_malloc(self):
      # call directly without malloc/free_all_blocks.
      assert self.pool.n_free_blocks() == 0
  
imports: import unittest
  from cupy.cuda import pinned_memory
label_desc: Use image node_id 10 for calling the TestSingleDeviceMemoryPool obj's underlying member method code with example usage: obj.test_n_free_blocks_without_malloc() without return types