//throws because plast<pfirst
CPPUNIT_ASSERT_THROW(group=new MPIProcessorGroup(comm_interface,1,0),INTERP_KERNEL::Exception);
//throws because plast is beyond size-1
//throws because plast<pfirst
CPPUNIT_ASSERT_THROW(group=new MPIProcessorGroup(comm_interface,1,0),INTERP_KERNEL::Exception);
//throws because plast is beyond size-1