Testers make your job easier so don't give them a hard time. You would think most developers realize this, but most don't. I have seen countless times where developers believe a tester is out to get them. I know some are thinking how does a tester help me. I write code and a tester will try to break that code. Let me let you in on something, you want a tester to find your bugs before it goes into production. Dealing with production bugs are stressful. Personally I like when something is found in a test cycle. That is one less issue to pop up when I am focused on some other project. Trust me, this will happen.