to put the test in the appropriate directory, id have to java files to
grade build configs, because it currently only checks for kotlin tests.

create a temp zip file > create a destination that is a file not a
directory (guaranteed exception) -> unzip throws ioexception because it
expects a directory not a file -> catch it -> check if the zip file is
still open -> if true == leak.

Ive also removed the test since its OS specific, and new code is
supposed to be in kotlin.