The Bitcoin whitepaper is hidden in every copy of macOS
I'm going to sound like a grouch, but that's not my intention. If the bitcoin PDF was chosen as a test file, it seems far too basic to be a valuable test for an Apple developer to be using (after all, PDFs can be insanely rich) and I have to believe that Apple is full of people that have Adobe on speed dial or are otherwise sufficiently creative to make a nice Apple-grade PDF that stretches the format to its limits.It's possible that the test file is for an end user to verify function, not an Apple dev, I guess, but then in that case Id expect Apple to provide something much more clear (say, Apple logo with "if u can read this, great" rendered in multiple languages") that supported their aims of branding, lack of legal encumbrance, and international support.