Test Driven Development [TDD] and Behaviour Driven Development [BDD] are often confused because the similarity of their names. TDD is the original technique – “engineering practice where the developer writes their Unit Test case before they write their code”. It helps raise quality by ensuring the developer built what they intended to. However, it doesn’t prove that the developer had the right intention when they wrote the code. BDD is an evolution of TDD. In this approach, the people doing the work – often a BA, Developer, and Tester – work together to define the acceptance criteria as examples that could be understood by a non-technical person. Further, the examples are often automated as acceptance tests on the boundary of the system.
The internet is rife with sources that advocate one over the other. This feels disingenuous. My experience is that I usually need both tools along the delivery path for a product.
- TDD vs BDD: A Developer’s Pocket Reference With Examples
- TDD vs BDD – from Matt Wynne
- What’s the difference between Unit Testing, TDD and BDD?
Mark Levison has been helping Scrum teams and organizations with Agile, Scrum and Kanban style approaches since 2001. From certified scrum master training to custom Agile courses, he has helped well over 8,000 individuals, earning him respect and top rated reviews as one of the pioneers within the industry, as well as a raft of certifications from the ScrumAlliance. Mark has been a speaker at various Agile Conferences for more than 20 years, and is a published Scrum author with eBooks as well as articles on InfoQ.com, ScrumAlliance.org an AgileAlliance.org.
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