code: def testWTick(self):
      tick = MPI.Wtick()
      self.assertIs(type(tick), float)
      self.assertGreater(tick, 0.0)
  
imports: from mpi4py import MPI
  import mpiunittest
  import os
label_desc: Use image node_id 8 for calling the TestEnviron obj's underlying member method code with example usage: obj.testWTick() without return types