code: def test_greedy_actions(self):
      if not self.has_maximizer:
          return
      self.assertIsInstance(self.av.greedy_actions, chainer.Variable)
      np.testing.assert_equal(
          self.av.greedy_actions.array, self.maximizer().array
      )
  
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 3 for calling the TestSingleActionValue obj's underlying member method code with example usage: obj.test_greedy_actions() without return types