The Value of Testing to Nop

Even professional programmers with decades of experience still struggle to come up with the right tests. So how do you concretely teach people to test if they're not really advanced programmers? Some part of testing just comes with experience, like knowing, oh, i have to test an empty imput,. And so i'm trying to teach you defensivepo ramming in the same way. I hope that after seeing what is like 22 examples of that, tithede o, see the utility of this.