code: def test_concatenate_32bit_boundary(self):
      a = cupy.zeros((2**30,), dtype=cupy.int8)
      b = cupy.zeros((2**30,), dtype=cupy.int8)
      ret = cupy.concatenate([a, b])
      del a
      del b
      del ret
      # Free huge memory for slow test
      cupy.get_default_memory_pool().free_all_blocks()
  
imports: import numpy
  import pytest
  import cupy
  from cupy import testing
  from cupy import cuda
label_desc: Use image node_id 16 for calling the TestJoin obj's underlying member method code with example usage: obj.test_concatenate_32bit_boundary() without return types