Test optional, site-supplied subroutines to verify that they load
    and function correctly.

    Syntax

      TEST/BLOCK_DAYS  image-spec starting-time ending-time size

                       remainder

      TEST/CONNECT  image-spec starting-time ending-time

      TEST/MESSAGE_MAPPING  image-spec

      TEST/PATHS  path-file-spec

      TEST/PROFILE_MAPPING  image-spec

    Command Qualifiers             Defaults

    /BLOCK_DAYS
    /CONNECT
    /MESSAGE_MAPPING
    /PATHS
    /PROFILE_MAPPING