TEST/MAPPING may be used to test the behavior of a mapping table
    in the mapping file. The result of mapping an input string
    will be output along with information about any metacharacters
    specified in the output string.

    If an input string is supplied on the command line, then only the
    result of mapping that input string will be output. If no input
    string is specified TEST/MAPPING will enter a loop, prompting
    for an input string, mapping that string, and prompting again
    for another input string. TEST/MAPPING will exit when a CTRL/Z is
    entered.