unleashing the power of bdd - good...

Unleashing the Power of Behavior Driven Development

Jeffrey Davidson e: [email protected] t: @JeffreyGoodReq b: goodrequirements.com BusinessAnalystWorld Toronto May 14, 2012

© Jeffrey Davidson, 2012

Today’s Agenda

!  Thinking like an investor

!  Communicating through examples

!  Bridging understanding


What matters

If you want to add . . . Value

. . . argue about features . . . ask about why

Value


Simple?

!  “We can only hope to make reliable those things that we can understand.

!  We can only consider a few things at a time.

!  Intertwined things must be considered together.

!  Complexity undermines understanding.”

“Simple Made Easy” by Rich Hickey @ StrangeLoop 2011


Stories


Do you mean User Stories?

As a . . . , I want . . . So . . . .


User Stories are Statements

!  User Stories do not give all the preconditions or all the actors actions or all the system responses

!  “Promise of a future conversation”


In order to . . . ,

Do you mean User Stories?

As a . . . , I want . . .


Let’s practice

!  I want you to build my online reservation system


Let’s practice: User Stories


Let’s practice: User Stories

!  In order to ____________

!  As a _____,

!  I want to ____________.


What is BDD?

“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.”

Dan North @ Agile Specifications, 2009


What is BDD?

!  Fine grained, focused bits of behavior

!  Told in a story format

No, really, what is it?


– – context You & You

r condition

What you do

What you

see

Simple Structure

event response


– – Given

You & Your conditi

on

What you do

What you

see

Simple Structure

When Then


What is it?

!  It’s a bunch of tiny stories, using a particular grammatical structure.

!  It’s finding places of misunderstanding, and filling it with understanding.

!  It’s a conversation, captured.


Generic over Specific

!  Generic behavior (no design)

Imagine performing the

same actions on a

telephone interface!


Generic over Specific

!  Amplify with examples

Using Business Terms

in Natural Language


Let’s practice: Acceptance Criteria

!  


Let’s practice: Acceptance Criteria

Were you design

agnostic?

Did you use natural language? Was everything in business terms?


Let’s practice: Examples


Let’s practice: Examples

!  Given:

!  When:

!  Then:


Built right or Right product?

Gojko Adzic in Specification by Example, 2011

Built Right

Focu

s

Right Product

Spec by example


Built right or Right product?

Built Right

Right Product

Business Failure

Useless Crap

Success

Maintenance Nightmare



Benefits

To build the right product effectively, software dev practices need: !  Assurance all stakeholders & delivery

team members understand what needs to be delivered in the same way.



Benefits

To build the right product effectively, software dev practices need: !  Precise specifications so delivery teams

avoid wasteful rework caused by ambiguities and functional gaps.



Benefits

To build the right product effectively, software dev practices need: !  An objective means to measure when a

piece of work is complete.



Who Benefits?

!  Everyone!

!  Seriously, it helps everyone. •  Business •  Users •  Testers •  Developers •  Analysts


It’s not about tools

“These tools are intended for use by programmers to guide coding, but they can also be used to express business facing tests that drive development, involving customers more closely in the process.”

Lisa Crispin in Agile Testing, 2009


Downsides

!  May not help velocity

!  New (to you)

!  Tools (and all that jazz) may cause clutter, slow-down, new learning, other stuff


Recap

!  Find the value

!  Model the output

!  Put what’s important first

!  Communicate with scenarios

!  Build a bridge!


– – Given

You & Your conditi

on

What you do

What you

see

When Then


My Primary Sources

! Gojko Adzic BDD / Specification by Example gojko.net

!   Martin Fowler Crevasse of Doom (ferry boats & bridges)

martinfowler.com !   Liz Keogh BDD lunivore.com !   Chris Matts Invented: Feature Injection theitriskmanager.wordpress.com !   Dan North Crevasse of Doom & Invented: BDD dannorth.net


Share & Tell

This is licensed under Creative Commons Sharealike [CC BY 3.0] !  Please use it !  Please share it !  Please improve it !  As long as you credit me somewhere

Unleashing the Power of Behavior Driven Development

Jeffrey Davidson e: [email protected] t: @JeffreyGoodReq b: goodrequirements.com BusinessAnalystWorld Toronto May 14, 2012

unleashing the power of bdd - good...

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