Behaviour Driven Development (BDD) is a collaborative and disciplined technique to help us build the right product. In the last decade BDD has had her own bit of glory and criticism. Many teams in the recent past have reaped benefits from this technical practice, while some teams complain that are yet to find any value. This article focuses on answering two questions; What are the ideal conditions when teams should adopt it? How to adopt it the right way ?
3. 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.
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Dan North
5. The BDD Philosophy : how can we collaborate better ?
5
Product Owner
Developers Quality Assurance
Production Support
Business
6. The BDD school of thought ,Outside in
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Spec
Test
Code
Outside in
7. The flow
7
N-1 N N+1
» Sprints
spec
» Sprint planning
» Pull only those with spec ready» Three Amigo
Meetings
» BA ,PO
» Developers
» QA
» Production Support
» Any one who could
contribute in scenario
identification
• Disciplined delivery
• Working agreements
• DOR
• DOD
• Less risk of failure
10. BDD Myths
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• Myth 1: BDD requires a framework or tool
• Myth 2 : BDD is about testing
• Myth 3: BDD has to be done top-down
11. • “Step Away from the Tools”
• “BDD isn’t about the tools.”
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Liz Keogh
Myth 1: BDD requires a framework or tool
12. • #BDD supports collaboration. If u can’t
collaborate please don’t try using Cucumber as
test automation
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Myth 2 : BDD is about testing
Seb Rose
13. In fact, BDD isn’t even really about testing. It’s just
a way of capturing those conversations which
happens to provide some tests, and lifts some of
the burden on the testers. If you want to run
additional performance tests, exploratory tests, or
even record some tests, it doesn’t have to come
under the BDD banner. It’s perfectly OK to do
BDD and test things as well.
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Liz Keogh
Myth 2 : BDD is about testing
14. +Scenario 1: Account is in credit+
Given the account is in credit
And the card is valid
And the dispenser contains cash
When the customer requests cash
Then ensure the account is debited
And ensure cash is dispensed
And ensure the card is returned
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+Scenario 1: Account is in credit+
Given the account is in credit
And the card is valid
And the dispenser contains cash
When the customer requests cash
Then check that the account is debited
And check that cash is dispensed
And check that the card is returned
And check that nothing happens that shouldn’t
happen and everything else happens that should
happen for all variations of this scenario and all
possible states of the ATM and all possible states of
the customer’s account and all possible states of
the rest of the database and all possible states of
the system as a whole, and anything happening in
the cloud that should not matter but might matter.
James Bach
Myth 2 : BDD is about testing
24. Time and effort spent ∝ problem space complexity
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• More the problem space complexity , more time has to be spent
debating discussing and detailing scenarios
• When problem space is simple , spending lot of time on scenario
identification might not make sense
• Different features have different types of complexity
25. How to measure complexity
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Points Complexity Description
1 Just about everyone in the world has done this
2 Lots of people have done this, including someone on our team.
3 Someone in our company has done this, or we have access to expertise
4 Someone in the world did this, but not in our organization (and probably
at a competitor)
5 Nobody in the world has ever done this before
Second Order ignorance
We say second order of ignorance exist if “when I don't know that I
don't know something”.
Liz Keogh
