There was another change implemented as part of this: trailing whitespace is now stripped from the lines emitted by the disassembler, which made it possible to simplify the tests a bit (since they no longer have to strip that whitespace themselves, they can just do normal string comparisons)

I rediscovered this existing issue, since the new more comprehensive tests for correct handling of the file parameter didn't have the extra operations to strip the trailing whitespace from each line. Rather than adding it, I just fixed the dissassembler to avoid emitting it in the first place (that was a lot easier now that Instruction._disassemble was the sole place responsible for emitting each line)