FluidSurveys offers you the ability to delete all of the responses in a given survey or even some of the responses in a survey (i.e. garbage results). By using this feature you will be able to send out your survey to a number of people for testing purposes and then when the testing is over, you will be able to delete the responses to get ready for launching your full survey.
Please visit the following link to learn how to delete your responses: How to delete your survey responses
Watch this video demonstration of FluidSurveys: