[poppler] General interest: regression testing techniques for pdfs?

[Albert Astals Cid]

A Divendres, 29 d'octubre de 2010, Christian Feuersaenger va escriure:
> Dear Developers,
> 
> I am author of a program which generates pdf output and as such I am
> thinking about improvements to my regression tests... perhaps I can
> learn from your very successful testing framework.

I wouldn't call it "very successful" nor "framework" as it's a 10 line bash 
script :D

> Is there some sort of automatic system which compares screenshots
> somehow? 

diff a.png b.png

If they are equal, good no change happened! If they are different then 
  convert a.png b.png -compose difference -composite -colorspace gray miff:- | 
display
will give you an image with the differences, and
  convert a.png b.png -compose difference -composite -colorspace gray miff:- | 
identify -verbose -
will give you some interesting data and you can have look at the standard 
deviation for example to know how much the rendering has changed

Albert

> Or any other type of automatic comparison function? In that
> case, I would be interested in using a similar approach for my own
> work... and I would appreciate any hints.
> 
> Thanks!
> 
> Best regards
> 
> Christian
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