nmrao I mean to say here is, the developers can test their own code using UNIT testing. Whatever they do. After that all the other types of testing should be done by testers only.
And, I have changed the sentence.
And also, Developers normally work with the developer mindset of "how to make this work?". A good tester is thinking about "how to break this?" - a very different mindset. Unit testing and TDD does teach developers to change hats to some extent. Moreover, there can be a possibility of misunderstanding requirements. Therefore final acceptance tests should be conducted by someone as close to the client as possible.
