Comment 52 for bug 282186

Then I think that HPLIP (and all other printer setup tools)
which send a PostScript program as printing test page
should submit their test page print jobs using
"-o document-format=application/vnd.cups-postscript"

A positive sude-effect is that this way document manager options
like "n-up" and "fitplot" (which might be preset for a print queue)
are ignored which is wanted for a real test page printout.

For a real PostScript printer a PostScript test page program
might be even submitted using "-o raw" to ignore any possible
"cupsFilter" setting (those exist in particular PPDs even for real
PostScript printers).

Of course PDF is the better format for usual documents.
If in the future pure PDF printer driver solutions come up,
the default test page should be also an appropriate PDF.