Peppol BIS 3 Test (Example) missing

I like this lib. Pretty solid. Was able to generate a valid UBL 2.2 invoice with little effort.
You claim you support Peppol BIS 3.0 as well, however it seems there is no example or test file for that.
I am not familiar with the format, so if anyone has an example similar to the existing invoice test, that would be greatly appreciated :)