BDD (Behavior-Driven Development) is a methodology that focuses on defining and testing desired behaviors through examples and interactions between developers and stakeholders. It describes a cycle of defining requirements as behaviors or acceptance criteria using a ubiquitous language, implementing the behaviors, and validating them through automated tests. BDD tools like Cucumber allow automating the validation of requirements through scenarios, outlines, and steps that result in the delivery of working, tested software.

1. Exploring BDD
BDD WTF?
By John J Nolan.

2. Aims
Define BDD
Cucumber
Kata/ Koan/ Kumite?

3. A quick
summary...
Dan North sees a pattern of
misunderstanding.
TDD
People are confused.

4. ‘Test’ is
ambiguous
we are verifying behaviour
should > test

5. Lots of ‘should’
Frameworks
JBehave
RSpec
MSpec
NBehave

6. It’s all behaviour.

7. It’s all specification.

8. Requirements
(ARE BEHAVIOUR)

9. Given When Then
A Ubiquitous Language.
Story’s Behaviour is its acceptance criteria.

10. BUT IS THAT IT?
BECAUSE...

11. BDD IS A SECOND-GENERATION,
OUTSIDE-IN, PULL-BASED,
MULTIPLE-STAKEHOLDER,
MULTIPLE-SCALE, HIGH-
AUTOMATION, AGILE
METHODOLOGY. IT DESCRIBES A
CYCLE OF INTERACTIONS WITH
WELL-DEFINED OUTPUTS,
RESULTING IN THE DELIVERY OF
WORKING, TESTED SOFTWARE THAT
MATTERS.

12. tl;dr

13. Second Generation
Evolution of XP
TDD
DDD
ATDD

14. The BDD
Cycle
Outside in

15. Pull Based
Respond to demand
A focus on value

16. Multiple Stakeholder
Not just the end user
Other stakeholders include gold owners
it users
maintaing developers

17. Multiple
Scale
Outside and as at internal
level

18. HIGH AUTOMATION
INSTANT FEEDBACK

19. Agile Methodology?
Assume you've got it wrong.
Have conversations to find out how wrong.
When you know enough to get feedback on the
rest, implement and release.
Assume you've got it wrong.

20. IT DESCRIBES A CYCLE OF INTERACTIONS WITH WELL-
DEFINED OUTPUTS, RESULTING IN THE DELIVERY OF
WORKING, TESTED SOFTWARE THAT MATTERS.

21. CUCUMBER
& OTHERS

22. Code?

23. Workflow
Write Specs
Run cucumber
Complete Step
Definition
Run Cucumber
Move on to next one
until done.

24. Imperative
Or Declarative

25. Helpful stuff
Reuse steps
Scenario tables
Scenario outlines
tags

26. At UI
Or subcutaneously

27. A Koan

28. CHESS BOARD
MODELLING SIMPLE BEHAVIOURS

29. Rules
2 Pieces Game is either won( a
piece is taken)
White Pawn
Or drawn
Black Knight
Placed anywhere on
board
Up to 2 rounds of
moves

30. I have some specs
Fork me. fill in questionnaire
https://github.com/ send me a pull
johnnonolan/ request
ChessBoard-Kata
or email
Branch me
or tweet
look at questionnaire
Do it