Hello i am new here and i hope i have placed this in the right part if not forgive me

I am currently fixing some assignments i have had with in terms of pascal language.I know pascal is very Old language and these days the compiler has problems in terms of running. I am using free compiler since also i am on a mac book/Boot camp

I have made a program quite basic for the assignment however i am very stuck on Pascal Testing my program.

you must fully test, evaluate and produce documentation for the solution produced.
Critically review and test the program against the user requirements. You need to complete black & white box testing and ensure you check every possible outcome.

What the *** is black box testing and how do i do it? Ive looked around on Google and cant find anything

Cheers