with matt wynne - sioux · behaviour driven development matt wynne november 11 - 12, 2014 language...
TRANSCRIPT
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Behaviour Driven Development
Time for a healthy talk
with Matt Wynne
Hans Odenthal
September 22nd, 2014
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Program
18:00 Welcome
18:05 Behaviour Driven Development, part 1
19:30 Break
20:00 Behaviour Driven Development, part 2
20:55 Hot or Not?
21:00 Drinks
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Behaviour Driven Development
Is it about discipline?
Are fast results not healthy?
Does green always mean good?
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Matt will give
all the answers
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Matt, the floor is yours …
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Behaviour-Driven Development
Matt WynneSioux Embedded Systems, Eindhoven22 September 2014!@[email protected]
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What is BDD?
...and why should I care?
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About Matt
• Programmer
• Agile / lean advocate & coach
• Author of The Cucumber Book
• Founder of Cucumber Ltd
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Stakeholders, Customers,
UsersProgrammers,
Testers
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Problem Domain
Solution Domain
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Ubiquitous Language
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Problem Domain
Solution Domain
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Problem Domain
SolutionDomain
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Deliberate discovery
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There are known knowns; there are things we know that we know.
!
There are known unknowns; that is to say there are things that, we now know we don't know.
!
But there are also unknown unknowns – there are things we do not know we don't know.
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ASSUME YOU'RE
IGNORANT
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Specification by example
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Ideas
Requirements
Examples
Automated Tests
Code
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CONVERSATIONS
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The Three Amigos
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ProblemDomain
SolutionDomain
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Sustainable delivery
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Cost of a change
Time
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You can't have clean code without refactoring
You can't refactor without good automated tests
You can't stay agile without clean code
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Write a failing test
Make it pass
Clean up!
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Living documentation
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So what is BDD?
• Using examples to drive conversations
• Using conversations to grow the team's domain knowledge
• Using automated tests for the examples, to keep total cost of ownership under control
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The floor is yours …
© Sioux 2013 | Confidential | 1
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L I F E A F T E R B D DM A T T W Y N N E , S O I U X E I N D H O V E N 2 0 1 4
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A G I L E
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S C R U M
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S TA G E 1 :
B U R N E D T O A S T
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S TA G E 1 : B U R N E D T O A S T
1. Programmers write bugs
2. Testers find bugs
3. Project managers prioritise bugs
4. Programmers fix bugs
5. GOTO 1
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I ’ L L B U R N I T, Y O U S C R A P E I T ”
“ L E T ’ S M A K E T O A S T T H E A M E R I C A N W AY:
– D E M M I N G
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S TA G E 2 :
A U T O - B U R N E D T O A S T
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S TA G E 2 : A U T O - B U R N E D T O A S T
1. Programmers write bugs
2. Testers write automated tests
3. Automated tests find bugs
4. Project managers prioritise bugs
5. Programmers fix bugs
6. GOTO 1
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T H AT I S N O T B D D
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E V E N I F Y O U ’ R E U S I N G
C U C U M B E R
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C O D E T E S T F I X
B U I L D I N G
S O F T WA R E
B A C K WA R D S
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B E H AV I O U R D R I V E N
D E V E L O P M E N T
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C O D E T E S T F I X
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S TA G E 3 :
T H R E E A M I G O S
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S TA G E 3 : T H R E E A M I G O S
1. Programmers, Testers and BAs define behaviour together
2. Programmers write (less) bugs
3. Testers write (more) automated tests
4. Automated tests find bugs
5. Project managers prioritise bugs
6. Programmers fix bugs
7. GOTO 2
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Story
Rule
Example
Question
QuestionRule
Example
Rule
Example
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S TA G E 3 : T H R E E A M I G O S
1. Programmers, Testers and BAs define behaviour together
2. Programmers write (less) bugs
3. Testers write (more) automated tests
4. Automated tests find bugs
5. Project managers prioritise bugs
6. Programmers fix bugs
7. GOTO 2
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W H Y D O T E S T E R S H AV E T O A U T O M AT E
T H E T E S T S ?
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S TA G E 4 :
T E S T- F I R S T
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S TA G E 4 : T E S T- F I R S T
1. Programmers, Testers and BAs define behaviour together
2. Team automate tests for that behaviour
3. Programmers make the tests pass
4. Testers find missing scenarios
5. GOTO 2
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B D D
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S TA G E 5 :
D I S I L L U S I O N M E N T
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S TA G E 5 : D I S I L L U S I O N M E N T
• Lots of scenarios
• Build takes ages
• Build normally broken
• Some scenarios flicker
• Poor / mixed readability
• I hate Cucumber
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VA L U E O F A T E S T O V E R T I M E
-25
0
25
50
75
100
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W H E N ’ S T H E L A S T T I M E
Y O U P U S H E D A T E S T D O W N ?
(or just deleted it altogether)
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Y O U S T I L L H AV E T O
D O S O F T WA R E
D E S I G N
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S TA G E 6 :
T R A N S C E N D E N C E
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S TA G E 6 : T R A N S C E N D E N C E
• Problem domain is well understood by the team
• Solution models the problem well
• Scenarios are actually readable
• Rules over examples
• Clear architectural boundaries
• Fewer end-to-end tests
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T H E E N D
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Hot-or-Not?
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‘Komkommertijd’?
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More Hot-or-Not
Oct 22 littleBits Workshop
Hot-or-Not, The Next Generation
Nov 10 Markus Völter & Tijs van der Storm
MDSD: What's the right way to go?
More information: www.sioux.eu/hotornot
© Sioux 2013 | Confidential | 3
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www.sioux.eu/premiumcourses
September 23 - 24, 2014
Behaviour Driven Development
Matt Wynne
November 11 - 12, 2014
Language Engineering with MPS
Markus Völter
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Thank you