code: def testWTime(self):
      time1 = MPI.Wtime()
      self.assertIs(type(time1), float)
      time2 = MPI.Wtime()
      self.assertIs(type(time2), float)
      self.assertGreaterEqual(time2, time1)
  
imports: from mpi4py import MPI
  import mpiunittest
  import os
label_desc: Use image node_id 7 for calling the TestEnviron obj's underlying member method code with example usage: obj.testWTime() without return types