When faced with a prompt: "Input a number from 1 to 5", a tester asks "What if I put in 6?". One possible answer might be: "The program crashes." In this sit

When faced with a prompt: "Input a number from 1 to 5", a tester asks "What if I put in 6?". One possible answer might be: "The program crashes." In this situation, there is no problem with the program right now, only at some hypothetical point in the future when someone actually enters an invalid value.