[Zope] How to access the content of a file in a test suite in a portable way

Hi all. I'm writing a number of acceptance tests where I need to compare whether the content of a text file is equals to another file. The comparision files are in a subdirectory of the acceptance test directory itself, therefore, once I know where my product is on the filesystem, I can access the test files from there. What is the accepted way to do know the directory of a product? Regards Marco -- Marco Bizzarri http://notenotturne.blogspot.com/ http://iliveinpisa.blogspot.com/