Imagine this: the spec is Math.pow(x,y). It was implemented as Math.pow(y, x). The test was written with x=2, y=4. It is accidentally correct. This is why any u

Imagine this: the spec is Math.pow(x,y). It was implemented as Math.pow(y, x). The test was written with x=2, y=4. It is accidentally correct. This is why any unit tests dealing with absolute or enum values needs to run multiple iterations.