Ok but honestly, most people are not coding raw low level data structure algorithms. They are coding business algorithms. "Here's a table of accounts, calcula

Ok but honestly, most people are not coding raw low level data structure algorithms. They are coding business algorithms. "Here's a table of accounts, calculate what they owe" When one says "wide range of inputs", as gp did, one is not talking about low-level algorithms; one is talking about a business algorithm. You should be using TDD for this.