That's my approach as well. My idea is I can change the numbers, and it still better come out right. It forces you to think through (and code) things more clear

That's my approach as well. My idea is I can change the numbers, and it still better come out right. It forces you to think through (and code) things more clearly. It's too easy to write a test with hard-coded numbers that "just happens" to come out right.