@yisraeldov
One might posit that actually test_hello_world. should precede hello_world. :)
@yisraeldov Well, if you test first, you on'y need to really know the syntax of your test package... :) Since it is going to fail anyway, it might help you to get the syntax as well.
@Absinthe Well the `hello world` example is usually just to show the syntax of the language, it will be hard to write tests if you don't know the syntax first. But anything more than that should be test first.