GoDaddy could use some unit tests

For those who frequent the TechPodcasts network, like I do, you’ve probably heard of the 10% discount code for orders.  Everybody and their brother gives away GoDaddy 10% off codes.  The problem is that today it doesn’t seem to work.  Could it be a hidden policy (fine print) or could GoDaddy use some unit tests around thier shopping cart total calculations?