code: def check_value_check(self, x_data, t_data):
      x = chainer.Variable(x_data)
      t = chainer.Variable(t_data)
  
      if self.valid:
          # Check if it throws nothing
          functions.select_item(x, t)
      else:
          with self.assertRaises(ValueError):
              functions.select_item(x, t)
  
imports: import unittest
  import numpy
  import chainer
  from chainer.backends import cuda
  from chainer import functions
  from chainer import gradient_check
  from chainer import testing
  from chainer.testing import attr
label_desc: Use image node_id 3 for calling the TestSelectItemValueCheck obj's underlying member method code with example usage: obj.check_value_check(x_data, t_data) without return types