Behavior-Driven Development (BDD) in Agile Software Development
Introduction to BDD
“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.”
-Dan North 2009
Where did BDD come from?
TDD was first
BDD better defined “what” to test
Core
C
oncepts
•
uses dsl (domain specific languge)
•
leverage red/green/clean from TDD
•
usually integrated with a tool
T
ypical
S
pecification has two parts
Story/Narrative
•
Who
•
What
•
Why
Acceptance Criteria
•
Initial condition
•
Trigger event
•
Expected Outcome
•
Often Gherkin
(given/when/then)
E
xamples
Specialized Tooling
What do the tools do?
•
R
eads the document
•
Understands key words ex:“then”
•
Cl
auses transformed to test parameters with help
from
developers
•
E
xecutes the test scenarios
E
xamples
•
Jbehave
•
Rbehave
•
Cucumber
•
Rspec
•
JDave
What are the benefits?
•
Better collaboration
•
H
igh visibility – common language
•
Software design follows biz value
•
u
sers more satisfied
•
More confident devs
•
Hi
gher quality and lower cost
Behavior-Driven Development (BDD) is a powerful methodology that emphasizes collaboration, automation, and delivering software that matters. It builds on Test-Driven Development (TDD) by focusing on defining behaviors and outcomes first. Core concepts include using domain-specific languages, integrating with tools, and following structured specifications like Gherkin syntax. BDD tools like Jbehave, Cucumber, and Rspec help translate requirements into executable tests, promoting better collaboration, visibility, and software quality while reducing costs.
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Presentation Transcript
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. -Dan North 2009
Where did BDD come from? TDD was first BDD better defined what to test
Core Concepts uses dsl (domain specific languge) leverage red/green/clean from TDD usually integrated with a tool
Typical Specification has two parts Acceptance Criteria Initial condition Trigger event Expected Outcome Often Gherkin (given/when/then) Story/Narrative Who What Why
What do the tools do? Reads the document Understands key words ex: then Clauses transformed to test parameters with help from developers Executes the test scenarios
Examples Jbehave Rbehave Cucumber Rspec JDave
What are the benefits? Better collaboration High visibility common language Software design follows biz value users more satisfied More confident devs Higher quality and lower cost
