Use Case Testing
Use case testing derives test cases directly from documented use cases — structured descriptions of how an actor (a user or another system) interacts with the system to achieve a goal, including the main success path and alternate or exception paths.
A use case typically documents a primary flow (everything goes right) and several alternate flows (a validation fails, a payment is declined, a session times out) — use case testing turns each of those documented flows into at least one test case, ensuring the paths product and business teams already thought through actually get verified.
Because use cases are written from the user's perspective and describe real goals rather than technical implementation, use case testing tends to produce test coverage that maps closely to what actually matters to the business, complementing more technical, code-focused testing techniques.
