new_contents: from agents.dpp import DPP
  import replay_buffer
  from test_dqn_like import _TestDQNLike
  from chainer import testing
  
  
  @testing.parameterize(
      {'eta': 1e-2},
      {'eta': 1e-1},
      {'eta': 1e-0},
      {'eta': 1e+1},
  )
  class TestDQN(_TestDQNLike):
  
      def make_agent(self, gpu, q_func, explorer, opt):
          rbuf = replay_buffer.ReplayBuffer(10 ** 5)
          return DPP(q_func, opt, rbuf, gpu=gpu, gamma=0.9, explorer=explorer,
                     replay_start_size=100, target_update_frequency=100,
                     eta=self.eta)
  
subject: Add tests for DPP