[bug #64959] [troff] add unit tests for `device` and `output` requests

[G. Branden Robinson]

Update of bug#64959 (group groff):

                  Status:                    None => In Progress            
             Assigned to:                    None => gbranden               

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Follow-up Comment #1:


[comment #0 original submission:]
> There appears to be an undiagnosed issue with `device`.  You can invoke it
"too early", and it won't appear on the output.  This might be the case any
time the vertical drawing position is negative.  Investigate and document.

Being dealt with in bug #65118.
 
> You can invoke `output` wherever you want, but this can also break the
invariant claimed in "Document parts" [sic] of groff_out(5).  So something
documentary needs to be said about that too.

I think I was mistaken here.  While developing unit tests, I can't actually
get anything to appear ahead of the "grout leader" ("x T ps" and so forth).

The rest is in progress.


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