This document discusses test-driven development (TDD) and behavior-driven development (BDD). It defines TDD as a process of writing automated tests before code to define desired functionality, then writing minimum code to pass tests and refactoring. BDD combines TDD techniques with domain-driven design and aims to facilitate collaboration between developers and business stakeholders. The document provides an example of using BDD to specify scenarios for generating life insurance risk quotes. It also outlines how to structure tests in TestBox and run test bundles.