In fact, a lot of software teams don't even believe in testing. In fact, they do. Most have managed to get this through their heads. But they still come up with lots of reasons not to have software testers, all of which are wrong. I hope I can explain to you why these ideas are wrong.
Bugs come from lazy programmers.
By avoiding testers, we can force the programmers to write correct code in the first place. If you think that, you either have never written code, or you are remarkably dishonest about what writing code is like. Bugs, by definition , leak out because programmers did not see the bug in their own code. A lot of times it just takes a second set of eyes to see a bug. I used my own habits, relying on the mouse a lot.