BDD - Behavior Driven Development
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This document introduces behavior driven development (BDD) and cucumber, a tool used for BDD. The presentation will explain what BDD is, its benefits and drawbacks, and practical experiences using it. BDD aligns development with business needs by having business stakeholders write acceptance tests in a simple Given-When-Then format. Cucumber automates these tests and allows tests to be written in a natural language everyone understands. The presentation demonstrates BDD and cucumber with a sample e-commerce checkout scenario.
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BDD - Behavior Driven Development
- 1. Welcome to the World of Behavior Driven Development railando .com Gain%%Speed%with%%Ruby%on% Rails Berlin, Sep 21, 2012
- 2. Welcome to the World of Behavior Driven Development railando .com Gain%%Speed%with%%Ruby%on% Rails Berlin, Sep 21, 2012
- 3. What to expect in this presentation? railando .com Gain%%Speed%with%%Ruby%on% Rails Berlin, Sep 21, 2012
- 4. What to expect in this presentation? railando .com Gain%%Speed%with%%Ruby%on% Rails Berlin, Sep 21, 2012
- 5. What to expect in this presentation? •Understand what BDD is •Understand its benefits • as well as its drawbacks. •Inspiration to your own thoughts •Hear about practical experience •Know where to get help: railando .com Gain%%Speed%with%%Ruby%on% Rails Berlin, Sep 21, 2012
- 6. Challenge question :-) What is the worst thing that can happen to a software development project ?
- 7. What to do about it? Align ideas of business, development and test Fully involve all three Embrace change Use the best tools and processes available
- 8. What is BDD? One concrete incarnation of Agile development The next logical step to Test Driven Development Acceptance Test is central Battle-proven toolset available BDD makes business (users) love to contribute!
- 9. cucumber Central to BDD Enables all stakeholders to write/approve specs Built on a simple paradigm: Given - When - Then Enables (acceptance) test automation of application-level specs cucumber makes business (users) love to contribute!
- 10. A simple example Given I have items in my cart And I have entered a German shipping address But none of my items is tax-exempt When I click “checkout” Then I see all my items with individual price And I see a “total” line And I see a VAT line stating 19 % And I see a grand total of 1.19 * total But I see no “sales tax” line
- 11. Automate it! :-) We write specs in natural language “Step Definitions” map English to code Use the power of regular expressions Each Given, When and Then clause causes some code to be executed Write Step Definitions in Ruby, Perl, Shell Scripts, Java, Javascript, .NET, etc.
- 12. A real life example See Demo
- 13. A real life example See Demo
- 14. Our experience We used BDD in Enterprise projects (e.g. large Swiss telecoms carrier) as well as startup environments Business departments / users are happy to have finally found a way how they can really contribute Acceptance test greatly simplified Additional work in the beginning for specs More than compensated, dramatically reduced rework
- 15. What now? Try it !
- 16. Finally Care for help? consulting? support? training? Don’t forget to give us a call ;-) bernd.blume@railando.com railando .com Gain%%Speed%with%%Ruby%on% Rails
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