TDD is very similare to define the use cases which make sense to di first. The difference is that they are expressed in a very formal way that can be used as va

TDD is very similare to define the use cases which make sense to di first. The difference is that they are expressed in a very formal way that can be used as validation test. In such example, the benefit would be that a change in the date matching algorithm could be done later and rely on the unit tests to detect a regression.