Apparently not thoroughly enough. Test environments are supposed to MATCH the production environment. But of course, secure coding doesn't apply to Bitcoins.
What does Bitcoin have to do with an exchange that is a completely different project?
You should word your trolls a little better or STFU.
Or in alternative tell me where in Bitcoin is that insecure coding... I suspect you will not find it, hell, even Dan Kaminsky admited that the coding is f'ugly but very secure and does what it's supposed to do(and I believe he really tried hard to find flaws in it).