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Exploring BDD	 	
BDD WTF?
By John J Nolan.
Aims


Define BDD

Cucumber

Kata/ Koan/ Kumite?
A quick
summary...	
Dan North sees a pattern of
misunderstanding.
TDD
People are confused.
‘Test’ is
ambiguous
we are verifying behaviour
should > test
Lots of ‘should’
Frameworks

             JBehave

             RSpec

             MSpec

             NBehave
It’s all behaviour.
It’s all specification.
Requirements
(ARE BEHAVIOUR)
Given When Then


A Ubiquitous Language.

Story’s Behaviour is its acceptance criteria.
BUT IS THAT IT?
BECAUSE...
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.
tl;dr
Second Generation

Evolution of XP

TDD

DDD

ATDD
The BDD
Cycle
Outside in
Pull Based


Respond to demand

A focus on value
Multiple Stakeholder

Not just the end user

Other stakeholders include gold owners

it users

maintaing developers
Multiple
Scale
Outside and as at internal
level
HIGH AUTOMATION
INSTANT FEEDBACK
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.
IT DESCRIBES A CYCLE OF INTERACTIONS WITH WELL-
  DEFINED OUTPUTS, RESULTING IN THE DELIVERY OF
    WORKING, TESTED SOFTWARE THAT MATTERS.
CUCUMBER
& OTHERS
Code?
Workflow
Write Specs

Run cucumber

Complete Step
Definition

Run Cucumber

Move on to next one
until done.
Imperative	
Or Declarative
Helpful stuff

Reuse steps

Scenario tables

Scenario outlines

tags
At UI	
Or subcutaneously
A Koan
CHESS BOARD	
MODELLING SIMPLE BEHAVIOURS
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
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

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Exploring bdd

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