Behavior Driven Development
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This document discusses Behavior Driven Development (BDD) as an evolution of Test Driven Development (TDD) that focuses on writing specifications and documentation in a user-centric way. BDD helps developers understand where and what to test by focusing tests around user stories and specifying behaviors for different contexts rather than just asserting outcomes. Examples are given demonstrating how to write BDD specifications for a Stack data structure focusing on behaviors for different contexts like an empty stack or full stack. Tools for implementing BDD with languages like JBehave, JDave, and Instinct are also mentioned.
Behavior Driven Development
- 1. Behavior Driven Development Chun-Wen Wang Aug 21, 2007
- 2. Background
- 3. TDD
- 6. Problem
- 7. Developers dont know ... where to start what to test what not to test how much to test in one go what to call tests how to 鍖x a broken test that TDD is about design
- 8. Test?
- 9. Assert?
- 12. BDD
- 13. Behavior Driven Development Its about writing speci鍖cations Its about writing how the code works Its about understanding how the system works Its about understanding what I have to write
- 14. BDD helps you realize where to start outside-in what to test user stories what not to test anything else how much to test in one go as little as possible what to call tests intent how to 鍖x a broken test documentation that TDD is about design ......?!
- 15. Behavior The actions or reactions of an object or organism, usually in relation to the environment. -- Wikipedia Anything that an organism does involving action and response to stimulation. -- Merriam-Webster
- 16. Example: Stack Stack as empty stack, .... as full Stack, .... neither empty nor full, ....
- 17. Example: Stack Speci鍖cation Stack as empty stack, .... as full Stack, .... neither empty nor full, ....
- 18. Example: Stack Stack Context as empty stack, .... as full Stack, .... neither empty nor full, ....
- 19. Example: Stack Stack as empty stack, .... Behavior as full Stack, .... neither empty nor full, ....
- 20. Behavior of Empty Stack Empty stack is empty is no longer empty after push ...
- 21. Behavior of Empty Stack Empty stack Context is empty Behavior is no longer empty after push ...
- 22. How to Do It? JBehave - 1.0.1 http://jbehave.org/ JDave - 0.9.0 http://www.jdave.org/ Instinct - 0.1.4 http://code.google.com/p/instinct/
- 23. Example (JDave)
- 24. < >
- 26. </ >
- 27. Further More
- 28. Discussed Not yet Module Under Test
- 29. Mock Objects
- 30. ... arent Stubs
- 32. Q &A