code: def test_print_report(self):
      x = self.x
      self.f.apply((chainer.Variable(x),))
      self.f.apply((chainer.Variable(x),))
      io = six.StringIO()
      self.h.print_report(unit=self.unit, file=io)
      expect = r"""\AFunctionName +ElapsedTime +Occurrence
   +Exp +[0-9.\-e]+(.s|sec) +[0-9]+
  \Z"""
      actual = io.getvalue()
      six.assertRegex(self, actual, expect)
  
imports: import os
  import time
  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 3 for calling the TestTimerPrintReport obj's underlying member method code with example usage: obj.test_print_report() without return types