code: def test_constant(self):
      self.start_tests(name="Constant")
      self.unittest(
          num_episodes=2, experience_update=False, agent="constant"
      )
  
file_path: tensorforce/test/test_agents.py
imports: from tempfile import TemporaryDirectory
  import unittest
  from tensorforce import Agent
  from test.unittest_base import UnittestBase
label_desc: Use image node_id 3 for calling the TestAgents obj's underlying member method code with example usage: obj.test_constant() without return types