Why do we test? Testing proves that our application works properly. Traceability, or being able to trace requirements to test cases, forms the foundation of your testing strategy. Test traceability is the ability to link a test to a set of requirements and verify that the application works as expected. Traceability matters as your product scales. When your application is small, it’s easy to pinpoint what’s broken. Most of these requirements can be tracked in a spreadsheet.