I had to google 4Test and found out it is an object-oriented language similar to C++.

If you look around you will not find any complete language converters between perl, java, c++, python... because that is far from trivial. Only writing a parser for such a language is a project that is measured in months

Your only hope may be to concentrate on a subset of the language and accept failure on some scripts, maybe even accept that translations may be defect without being able to detect that.

For parsing I can recommend Parse::RecDescent, as long as the language is highly structured. I wouldn't want to parse perl itself with RecDescent, but a clean parser-friendly language or a suitable subset might be acceptable