Behaviour Driven Development
What is it and do you need it?
Gordon Marsh, Founder and CEO, CodeFuse Technology
May 2015
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Agenda
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BDD History
• Developed by Dan North as a solution to issues
that he saw with TDD.
• Evolved out of Agile practices.
• Part of the “shift left” movement to test what you
can as early as you can.
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BDD Benefits
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Team clarity and understanding.
Well managed test automation.
Living documentation.
Less re-work.
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Defining a Behaviour
Typically business features will be defined as
a user story:
As a [role]
I want [feature]
So that I receive [value]
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OR
In order to [receive value]
As a [role]
I want [feature]
Defining a Behaviour
Given-When-Then (GWT) syntax
Given I have 100 shares of MSFT stock
And I have 150 shares of APPL stock
And the time is before close of trading
When I ask to sell 20 shares of MSFT stock
Then I should have 80 shares of MSFT stock
And I should have 150 shares of APPL stock
And a sell order for 20 shares of MSFT stock should have been executed
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BDD Process
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BDD and Automation
• BDD is often associated with automation, but it’s
not the sole point!
• Tools such as Cucumber and RSpec offer a
smooth process to convert your English
behaviours into an executable format.
• Usually underpinned by a tool such as Selenium.
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What Happened in Practice?
• Team one – fairly small, experienced, everyone bought into
the idea. Worked well.
• Team two – larger, less experienced, BDD viewed as a “testers”
thing with developers doing the techie bit. Improvements to
team understanding but big overhead. Questionable.
• Team three – Larger still, mixed experience, rejected BDD in
favour of SBE. Improvement to team understanding, smaller
overhead.
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Do you need BDD?
• CodeFuse has incorporated BDD into our cloud
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automation product, so we do think it’s useful!
Team/Company size
Experience and discipline
Do you have a problem? Communications?
Is there a better solution for you such as SBE?
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Behaviour
Driven
Development
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Background to CodeFuse
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Start-up lessons learned
Not a “how to” – Mistakes in the first year we’ve had to
address.
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Branding
Don’t invest too much time in branding too
early. You want something to build around,
but you may need to change and you don’t
know if there is a market.
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Traction
It’s all important!
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Route To Market
• Seriously, what is your RTM?
• That’s where you need to “get out there”.
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Team – The Ideal Trio
- Financial: Business focus
- Can YOU evolve?
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Stop looking at the headlights!
Quitting your job is only the first mental leap
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BDD and Start-Up
[email protected]
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