code: def test_q_values(self):
      self.assertIsInstance(self.av.q_values, chainer.Variable)
      np.testing.assert_almost_equal(
          self.av.q_values.array, self.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 2 for calling the TestQuantileDiscreteActionValue obj's underlying member method code with example usage: obj.test_q_values() without return types