code: def test_open_sim(self):
      self.start_tests(name="open-sim")
      self.unittest(
          environment=dict(environment="osim", level="Arm2D"),
          num_episodes=2,
      )
      self.unittest(
          environment=dict(environment="osim", level="L2M2019"),
          num_episodes=2,
      )
      self.unittest(
          environment=dict(environment="osim", level="LegacyArm"),
          num_episodes=2,
      )
      self.unittest(
          environment=dict(environment="osim", level="LegacyRun"),
          num_episodes=2,
      )
  
file_path: tensorforce/test/test_environments.py
imports: import pytest
  import unittest
  from test.unittest_base import UnittestBase
label_desc: Use image node_id 2 for calling the TestEnvironments obj's underlying member method code with example usage: obj.test_open_sim() without return types