Jackie, thank you for the welcome and also for the support of the usage that I am looking for. The way you described these words is exactly the way Freud uses them. As opposed to an "illusion", a "delusion" is when someone believes something that simply isn't true, and their desire to believe it is not the issue. But with an illusion (as in your example with the test) the issue is the fact that you believe it because you WANT to believe it.
Also, for the sake of others (like Chickie) I certainly am not trying to limit the usage of these terms to these usages exclusively and I understand the other ways in which they are commonly understood.