code: def test_total_used_bytes(self):
      self.assertNotEqual(0, self.h.total_used_bytes())
  
imports: import unittest
  import numpy
  import six
  import chainer
  from chainer.backends import cuda
  from chainer import function_hooks
  from chainer import functions
  from chainer.functions.math import basic_math
  from chainer import testing
  from chainer.testing import attr
label_desc: Use image node_id 2 for calling the TestCupyMemoryProfilerStatistics obj's underlying member method code with example usage: obj.test_total_used_bytes() without return types