PUBLIC MARKS from ghis with tags symfony & test

Unit testing can be a blessing and curse at the same time. Once you start doing it on a regular basis, it can become an addiction. You test everything, you feel the satisfaction of 110% test coverage giving you confidence in your code. But after a while, testing suddenly seems to slow you down. Everytime you make a change in your code you have to adapt several unrelated tests. How to avoid this happen.