code: def test_getitem(self):
      sliced = self.qout[:10]
      np.testing.assert_equal(
          sliced.q_values.numpy(), self.q_values[:10]
      )
      assertions.assertEqual(sliced.n_actions, self.action_size)
      assertions.assertIs(
          sliced.q_values_formatter, self.qout.q_values_formatter
      )
  
imports: import unittest
  import numpy
  import pytest
  import torch
  from pfrl import action_value
  from pfrl.testing import torch_assert_allclose
label_desc: Use image node_id 7 for calling the TestDiscreteActionValue obj's underlying member method code with example usage: obj.test_getitem() without return types