BDD agrees on examples before code

A finished feature gets rejected by cashiers because the discount rule differs from built behavior.

Nothing technically breaks, yet business meaning never aligned from the start across roles.

I gather owners and developers to write concrete examples before touching any code.

Cucumber defines BDD as cross role collaboration through examples checked automatically as living docs.

One simple case says carts above one hundred thousand earn ten percent on receipts.

Approved examples become shared understanding so interpretation debates shrink fast.

If TDD starts from a failing test guides coding, then CI gates every change early keeps examples passing.

I use it for business rules that teams easily misunderstand across boundaries.