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Behaviour Driven Development and some of the benefits it offers for developers, customers and testers. Originally presented at Skills Matter: http://skillsmatter.com/event/agile-testing/bdd-whats-in-it-for-me
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Behaviour Driven Development
what’s in it for me?
Brent Snook
Thursday, 15 October 2009
Brent who?
• from Melbourne, Australia
• self confessed Agile weenie
• working with BDD for about a year
• available for dev, coaching, children’s parties
• fuglylogic.com
• brentsnook
Thursday, 15 October 2009
Audience
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Audience
Customer
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Audience
Customer Developer
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Audience
Customer Developer Tester
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BDD ≈ DDD + TDD
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Principles of BDD
• It’s all behaviour
•Deliver stakeholder value
•Enough is enough
Thursday, 15 October 2009
Principles of BDD
• It’s all behaviour
•Deliver stakeholder value
•Enough is enough
Thursday, 15 October 2009
In order to speed billingAs a waiterI want to calculate bill total
story descriptions (JIRA, Wiki, Word)
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cheque.sum.should == 12.0
automated unit and acceptance tests
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1. Add £2.00 to bill2. Add £10.00 to bill3. Verify sum is £12.00
test procedures
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Translation
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Translation
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TranslationDONOT
WANT!!Thursday, 15 October 2009
Mmmmm.....Ubiquitous Given an empty billWhen I add £2.00And I add £10.00Then the total is £12.00
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Speak the Same Language
We can understand each other.We are more likely to gain a deeper insight of the problem.We have a better chance of building the right thing. Cool bananas!
Thursday, 15 October 2009
Principles of BDD
• It’s all behaviour
•Deliver stakeholder value
•Enough is enough
Thursday, 15 October 2009
Principles of BDD
• It’s all behaviour
•Deliver stakeholder value
•Enough is enough
Thursday, 15 October 2009
In order to ...
speed up billing ... why?
so that billing is cheaper ... why?
so that I can manage cost DING!
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Reduce Waste
I waste less time and money building things that aren't really needed and uncovering value helps me to prioritise properly. Fantabulous!
Thursday, 15 October 2009
Principles of BDD
• It’s all behaviour
•Deliver stakeholder value
•Enough is enough
Thursday, 15 October 2009
Principles of BDD
• It’s all behaviour
•Deliver stakeholder value
•Enough is enough
Thursday, 15 October 2009
Are We There Yet?
StepScenario
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Demo
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Are We There Yet?
StepScenario
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A Place to Start, A Place to Stop
Knowing where to start, what to do next and when to stop. Bonza!
And less superfluous stuff!
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(Barely) Sufficient Detail
Scenario: Simple bill totalGiven an empty billWhen I add 2 poundsAnd I add 10 poundsThen the total is 12 pounds
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Just Build It
I can start building something as soon as possible. Grouse!
Something to play with earlier!
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2
4
8
1112 12
Tota
l Que
stio
ns
Time
Questions Asked
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2
4
8
1112 12
Tota
l Que
stio
ns
Time
Questions Asked
Testing window
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2
4
8
1112 12
Tota
l Que
stio
ns
Time
Questions Asked
Testing window
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Spread the Load
DevReady Test Done
2 DAYS LEFT !!!
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Explore Early
Less chance of getting swamped and I get to uncover more problems. O' Frabjous day!
Bugs and new scenarios earlier!
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Useful Byproducts
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Safety Net
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Automated Tests
I can make changes with greater confidence and speed. W00t!
Hmm...could I use those?
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Manual Regression Testing
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Shared Ownership
Feature
Step Definitions
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Automated Regression Suite
I can focus more on exploratory testing. Zipidee do da!
Regression testing is cheaper and faster.
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Dead Specifications
Here Lies
Total Bill
Slipped awayOut of sightOut of mind
Won’t be rememberedThursday, 15 October 2009
Live SpecificationsFeature: Total a bill In order to speed billing As a waiter I want to calculate bill total
Scenario: Simple bill with two items Given an empty bill When I add 2 pounds And I add 10 pounds Then the bill total will be 12 pounds
Scenario: Remove item from bill Given an bill totalling 20 pounds When I remove 4 pounds Then the bill total will be 16 pounds
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Documentation on Demand
A comprehensive description of how my system should and does behave? On demand?!Splendiferous!
Handy for verifying behaviour too.
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What’s in it for me?• better understanding of
the problem
• a better chance of getting what I really need
• more efficient development
• quicker feedback
• live behavioural documentation
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What’s in it for me?• better understanding of
the problem
• knowing where to start, what to do next and when to finish
• the chance to start building something earlier
• safety net when I’m making changes
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What’s in it for me?
• better understanding of the problem
• more time to explore
• something to explore earlier
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Whoah There!
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Questions?
• brentsnook
• pub
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Links• http://skillsmatter.com/podcast/agile-testing/bdd-
whats-in-it-for-me
• http://behaviour-driven.org/
• http://dannorth.net/whats-in-a-story
• http://blog.objectmentor.com/articles/2008/11/27/the-truth-about-bdd
• http://en.wikipedia.org/wiki/5_Whys
• http://pragprog.com/titles/achbd/the-rspec-book
• http://www.infoq.com/minibooks/domain-driven-design-quickly
• http://cukes.info
• http://alistair.cockburn.us/Balancing+lightness+with+sufficiency
Thursday, 15 October 2009
Images/Fonts
• Blender - http://www.flickr.com/photos/lintmachine/2987986325
• Steering Wheel - http://www.flickr.com/photos/wheatfields/290438580
• Drinky Bird - http://www.flickr.com/photos/sfmike22/2326128380/
• Post It Note - http://www.flickr.com/photos/flatcat/3555774083/
• Digging for Treasure - http://www.flickr.com/photos/wessexarchaeology/51568417/
• Table Setting and Napkin - http://www.flickr.com/photos/sifu_renka/2789833722/
• Gravestone - http://www.flickr.com/photos/36041246@N00/3419197777/
• Bran - http://www.flickr.com/photos/trekkyandy/3316748814
• Tightrope - http://www.flickr.com/photos/marquette/1812518264/
• Repeat Icon - http://www.iconarchive.com/show/aesthetica-2-icons-by-dryicons/repeat-icon.html
• Silver Bullet - http://www.flickr.com/photos/annguyenphotography/3268547290
• “No” Sign - http://commons.wikimedia.org/wiki/File:No_sign.svg
• Avatar Editor - http://myavatareditor.com/
• Whiteboard Font - http://callsignkatejones.deviantart.com/art/House-Whiteboard-font-64929545
• Napkin Font - http://www.1001fonts.com/font_details.html?font_id=2178
Thursday, 15 October 2009
