So, I discovered exercism.io, and learned that they offer premade test suites for their lessons!
So, of course, I decided to see what I could get away with, and, I'm proud of my first attempt: https://paste.ee/p/Xj0nR
That's right, it creates a file, writes "Hello, World!" into said file, closes the file, reopens it, reads in the line to an array, then spits out the line.
It's all good, tho -- it passes the tests!