So the time has come to take the leap and upgrade your application to a new major version of the underlying framework, or, perhaps, to an entirely different framework… how do you ensure that none of your functionality or usability is impacted by a potentially drastic rewrite of the underlying systems? How can you move forward with 100% confidence in your migrated codebase? Testing, testing and more testing. Using a combination of unit, functional and acceptance tests can give you the certainty you need. In this talk, we will go over key strategies for ensuring that you begin with full code coverage and move forward with confidence.