[reportlab-users] Automatic testing PDF output

[Roberto Alsina]

I now a solution to this problem was posted a few months ago, but I really 
can't find it in the archives.

So, I spend a few hours trying to reinvent the wheel, and here it is for 
google's sake: compare PDF testing tests reportlab automatically.

It will check the metadata using pdfinfo (from poppler), and then visually 
page by page using imagemagick. If there are differences, you will have a  
diffpage-n.png where the differences are visible in red.

If you want to compare two PDF files ($bn.pdf and correct/$bn.pdf), and have 
imagemagick and poppler installed and a bourne style shell:

compare_pdfinfo() {
    # Given two PDF files $1 and $2, compare the output of pdfinfo except for
    # creation date.
    pdfinfo "$1" | grep -v CreationDate | grep -v "File size"> "$1.info"
    pdfinfo "$2" | grep -v CreationDate | grep -v "File size"> "$2.info"
    if cmp -s "$1.info" "$2.info"
    then
        true
        #echo "PDF metadata is correct"
    else
        echo "PDF metadata for $1 is wrong"
    fi
    rm "$1.info" "$2.info"
}

compare_pdfinfo $bn.pdf correct/$bn.pdf
if [ ! -d temp-$bn ]
then
	mkdir temp-$bn
fi
rm -f temp-$bn/*
convert $bn.pdf temp-$bn/page.png
convert correct/$bn.pdf temp-$bn/correctpage.png
cd temp-$bn
for page in page*png
do
result=`compare -metric PSNR $page correct$page diff$page 2>&1`
if [ "$result" = "inf" ]
then
	#echo "$page is OK"
	true
else
	echo "$page has ERRORs, see temp-$bn/diff$page"
fi
done
cd ..


The latest version of the script where this fragment comes from will always be 
at 
http://code.google.com/p/rst2pdf/source/browse/trunk/rst2pdf/tests/input/run_tests.sh

-- 
 ("\''/").__..-''"`-. .         Roberto Alsina
 `9_ 9  )   `-. (    ).`-._.`)  KDE Developer (MFCH)
 (_Y_.)' ._   ) `._`.  " -.-'  http://lateral.netmanagers.com.ar 
  _..`-'_..-_/ /-'_.'     The 6,855th most popular site of Slovenia   
(l)-'' ((i).' ((!.'       according to alexa.com (27/5/2007) 
"Our opponent is an alien starship packed with atomic bombs, I said. 
We have a protractor. Okay, I’ll go home and see if I can scrounge up a 
ruler and a piece of string."  — Neal Stephenson