new_contents: import unittest
  from klampt.sim import *
  
  class robotsimTest(unittest.TestCase):
  
      def setUp(self):
          self.world = WorldModel()
          self.world.loadElement('data/athlete_plane.xml')
          self.sim = SimpleSimulator(self.world)
  
      def test_getPIDGains(self):
          c = self.sim.controller(0)
          pid_gains = c.getPIDGains()
          self.assertIsNotNone(pid_gains)
          self.assertTrue(len(pid_gains),3)
          
  
  
subject: Revert "Temporarily removing tests"