code: def test_params(self):
      self.assertEqual(len(self.qout.params), 1)
      self.assertEqual(id(self.qout.params[0]), id(self.qout.q_values))
  
imports: import unittest
  import chainer
  import chainer.functions
  from chainer import testing
  import numpy
  from chainerrl import action_value
label_desc: Use image node_id 6 for calling the TestDiscreteActionValue obj's underlying member method code with example usage: obj.test_params() without return types