When to add someone as a co-author on an academic paper?

If someone does long tedious work that doesn’t involve any intellectual contributions, should they be added as a co-author?

Specifically, for a paper showcasing simulation results for an algorithm. If the code and the simulation scenarios are provided to a student and her work involved many hours of running simulations with maybe some tweaking of the code, should she be added as second author on the paper?

Personally, when I was an undergrad and I was in a similar situation, my name was not on the paper. Now, as a grad student, I find myself with the tables reversed.

So my questions are,
What would be the ethical thing to do?
What is the standard procedure in academia (if there is one)?