code: def setUp(self):
      # ensure all tests use their own file
      self.array_file = "tmp_array_file_{}.cereal".format(uuid.uuid4())
  
imports: import os
  import unittest
  import uuid
  import gc
  from scipy import sparse
  import numpy
  from tick.array.serialize import serialize_array, load_array
label_desc: Use image node_id 2 for calling the Test obj's underlying member method code with example usage: obj.setUp() without return types