Teachers Boycotting Testing

There are always people that don't believe in testing. Teachers in particular usually have an opinion on standardized testing and are either advocates for it or against it. We talked in class about "Scrap the Map", which was the boycott against a particular standardized test, and how successful it was; parents became involved and it gained more power as it kept spreading across Seattle and other states as well. This article talks about the boycotting of testing in Seattle: http://www.washingtonpost.com/blogs/answer-sheet/wp/2013/05/16/seattle-teachers-boycotting-test-score-a-victory/. The question is, does testing truly benefit students? If the answer is no, why do we continue to administer tests? I believe that teachers who take it upon themselves to refuse to administer these tests are on the right track to really helping students grow and develop in school