QA and scrum
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Unlocking potential. Accelerating performance
QA and
AGILEScrum
19th March 2013Clinton Bosch
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Scrum is …
NOT agile
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Agile fluency
Fluency | how a team develops software when it’s under pressure
distinct stages of agile, each with specific benefits and challenges
“Star” system
Entire teams fluency – not individuals
Teams evolve in a predictable order
Fluency at all previous levels
3
1 2
4
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One star create business value
• Management pillar• Easiest • Focus on team success
Benefit: Greater visibility into team’s work; ability to redirect
Investment: Team development and work process design
Core Metric: Team regularly reports progress from a business value perspective
Achievement: 45%
Time: 2 – 6 months
Source: http://martinfowler.com/articles/agileFluency.html
team
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Two star deliver on market cadence
• Technical pillar• Deliver to market cadence• Technical skills take time & effort, reduce productivity
Source: http://martinfowler.com/articles/agileFluency.html
Benefit: Low defects and high productivity
Investment: Lowered productivity during technical skill development
Core Metric: Team ships on market cadence
Achievement: 35%
Time: 3 – 24 months
EXTREME PROGRAMMING“moments to learn, lifetime to master”
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Cost of change A critical concept that motivates full lifecycle testing is the cost of change
Co
st o
f C
ha
ng
e
Development Time
Traditional
TDD / Agile
By retaining the minimum amount of project artefacts required to support the project, there is less to update when a change does occur
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automated testing
• Have you ever integrated a third party library into your project?
• You got a big manual full of nice documentation. At the end there was a thin appendix of examples. Which of the two did you read?
• That's what the unit tests are!
• They are the most useful part of the documentation.
• They are the living examples of how to use the code.
• They are design documents that are hideously detailed,
utterly unambiguous, so formal that they execute, and they cannot get out of sync with the production code.
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The sooner you test, the cheaper to fix
Design Implementation Test Post Release0
200
400
600
800
1000
1200
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wtf is uncle bob?
1. You are not allowed to write any production code unless it is to make a failing unit test pass.
2. You are not allowed to write any more of a unit test than is sufficient to fail; and compilation failures are failures.
3. You are not allowed to write any more production code than is sufficient to pass the one failing unit test.
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tdd
• If you have ever tried to add unit tests to a system that was already
working, you probably found that it wasn't much fun.
• You likely found that you either had to change portions of the
design of the system, or cheat on the tests;
• Because the system you were trying to write tests for was not
designed to be testable.
• For example, you'd like to test some function 'f'. However, 'f' calls
another function that deletes a record from the database. In your
test, you don't want the record deleted, but you don't have any way
to stop it.
• The system wasn't designed to be tested.
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tdd forces decoupling
• When you follow the three rules of TDD, all your code will be testable by definition! And another word for "testable" is "decoupled".
• In order to test a module in isolation, you must decouple it.
• So TDD forces you to decouple modules. Indeed, if you follow the three rules, you will find yourself doing much more decoupling than you may be used to.
• This forces you to create better, less coupled, designs.
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software testing pyramid
}}White
Box
BlackBox
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where does that leave the QA
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In order to manage my company’s asset register
As an asset manager
I want to be able to add new assets
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Questions
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