Looks like they have a few (3 or more?) Perl tests. This curriculum page makes it look like you got a stripped down version.

I took an in-house test at a recruiter's office about 1.5 years ago which had two broken questions (concretely wrong answers on things like args to built-ins) and many poor or v4-5.4 practices considered the right answer. I was in shock thinking I'd just lost the job. I complained about a couple of the questions and I was told that quite a few other applicants had said exactly the same thing. I ended up with the job after all. Not a fun experience though.