Need sample for pretty printing

[smoothdeveloper]

I'd like to use this great library to help with failing unit tests comparing expected/actual string values.

I'd like the diff to be pretty printed pretty much like github shows with each line prefixed with + and - and few lines of context around each diff.

I figured out how to use the library to get the list of diff but couldn't figure out how to implement the appropriate pretty-printing to do what I described.

I'd appreciate minimal code sample to do that!