Answer:
Salve, munde!
A very rough English pronunciation is: Sal - way, mun-deh!
Salve means "hello" in Latin. It is a generic greeting that can also be used to mean "welcome."
Salve is a singular greeting in Latin. Salvete is a plural greeting. As in, you use salve when you're saying hi to one person/thing, and you use salvete when you are saying hi to a group of people.
Mundus means "world" in Latin. It is a second declension masculine noun. In this sentence, we are saying hello to the world, so mundus needs to be in the vocative case instead of the nominative. It's like saying "Hello, Brutus!" when you see Brutus walking by. "Salve, Brute!"
Enjoy your slightly-more-nerdy coding test phrase.