I found this on Michael Kaplan’s Blog and found them to be quite amusing yet true!
Axiom I: If you have not tested it, assume it is broken.
Axiom II: If someone changes it, they probably broke it.
Axiom III: Sometimes when it is not changed, it breaks too.
Axiom IV: What is broken on the test machine often works fine on the dev machine.
Axiom V:There is always another bug that a user can find.
And there is of course the first theorem of test, which is largely based on applying on the developer’s doubt of Axioms 2, 3, and 5 created by the circumstances of Axiom 4:
THEOREM I: Developers will often not believe there is a bug until it is proven to them, sometimes with extreme prejudice.
And of course the corollary to Axiom V:
There are at least as many bugs left to be found as there are users who haven’t yet run your code.
