Unit tests for the libraries code.

[Benedikt Meurer]

MaLiK wrote:
> Hi
> 
> I've create test by putting diffrent params to the testing functions.
> It spit out critical warnings becouse i've put some null pointers
> to the functions. It crash becouse after calling this function
> xfce_desktop_entry_new(file_name, categories, -1)
> the last param is not check.

Yeah, please provide a patch with those issues fixed.

> Best regards
> MaLiK

Benedikt