message: Only add args where known
diff: @@ -7,8 +7,8 @@ find_package(Threads REQUIRED)
  gtest_add_tests_helper(StagingMPMD MPI_ONLY "" Engine.Staging. ".InSituMPI" EXTRA_ARGS "InSituMPI")
  if(ADIOS2_HAVE_SST)
  - gtest_add_tests_helper(StagingMPMD MPI_ONLY "" Engine.Staging. ".SST.FFS" EXTRA_ARGS "SST" "--engine_params" "MarshalMethod=FFS")
  - gtest_add_tests_helper(StagingMPMD MPI_ONLY "" Engine.Staging. ".SST.BP" EXTRA_ARGS "SST" "--engine_params" "MarshalMethod=BP")
  + gtest_add_tests_helper(StagingMPMD MPI_ONLY "" Engine.Staging. ".SST.FFS" EXTRA_ARGS "SST" "MarshalMethod=FFS")
  + gtest_add_tests_helper(StagingMPMD MPI_ONLY "" Engine.Staging. ".SST.BP" EXTRA_ARGS "SST" "MarshalMethod=BP")
  gtest_add_tests_helper(Threads MPI_NONE "" Engine.Staging. ".SST.FFS" EXTRA_ARGS "SST" "--engine_params" "MarshalMethod=FFS")
  gtest_add_tests_helper(Threads MPI_NONE "" Engine.Staging. ".SST.BP" EXTRA_ARGS "SST" "--engine_params" "MarshalMethod=BP")
  gtest_add_tests_helper(Threads MPI_NONE "" Engine.Staging. ".BP4_stream" EXTRA_ARGS "BP4" "--engine_params" "OpenTimeoutSecs=5")
  