code: def test_save_with_model(self):
      agent = TestAgent(self.alg)
      save_path1 = "mymodel.ckpt"
      save_path2 = os.path.join("my_model", "model-2.ckpt")
      agent.save(save_path1, agent.alg.model)
      agent.save(save_path2, agent.alg.model)
      self.assertTrue(os.path.exists(save_path1))
      self.assertTrue(os.path.exists(save_path2))
  
imports: import numpy
  import unittest
  import paddle
  import paddle.nn
  import parl
  import os
label_desc: Use image node_id 6 for calling the AgentBaseTest obj's underlying member method code with example usage: obj.test_save_with_model() without return types