I am trying to focus a bit on unit testing using PHPunit.
I have found a very good tutorial over here http://blog.nickbelhomme.com/php/phpunit-training-course-for-fre
I think you can use tearDown() method to clean your saved data.
tearDown()
protected $_user; public function testCanCreateUser() { ... $this->_user = new Model_User($userData); $this->_user->save(); } public function tearDown() { $this->_user->delete(); }