Score one for unit testing.

[Roy Smith]

We've got a test that's been running fine ever since it was written a 
month or so ago.  Now, it's failing intermittently on our CI (continuous 
integration) box, so I took a look.

It turns out it's a stupid test because it depends on pre-existing data 
in the database.  But, the win is that while looking at the code to 
figure out why this was failing, I noticed a completely unrelated bug in 
the production code.

See, unit testing helps find bugs :-)