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Behaviour Driven Development - Beyond given when then

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Behaviour Driven Development (BDD) builds upon Test Driven Development (TDD) by formalizing good habits like slicing tests vertically around user stories rather than horizontally across layers. This allows for earlier feedback. BDD expresses tests and examples using patterns like "Given, When, Then" to define the context, action, and expected outcome. It also encourages describing user interactions to enable testing through different interfaces.

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Behaviour Driven Development Beyond Given, When, Then Antony Marcano
The Telephone Game h<p://www.brokenpicturetelephone.com/
What is BDD? Beyond Given, When, Then
BDD Origins The deeper I got into TDD, the more I felt that my own journey had been less of a wax-足on, wax-足o鍖 process of gradual mastery than a series of blind alleys. I remember thinking If only someone had told me that! I decided it must be possible to present TDD in a way that gets straight to the good stu鍖 and avoids all the piFalls. My response is behaviour-足driven development (BDD). Over Lme, BDD has grown to encompass the wider picture of agile analysis and automated acceptance tesLng. -足Dan North
BDD Origins -足 Shortened Behaviour Driven Development (BDD) builds upon Test-足Driven Development (TDD) by formalising the good habits of the best TDD pracMMoners. The Cucumber Book, Aslak Helles淡y, Ma< Wynne
Some Good Habits Slice VerMcally Work from the outside-足in One example at a Mme
Slice VerMcally
SoWware Components SoWware Components (modules/classes) (modules/classes) Lme Lme 2009 Sprint nn IteraMon Sprint n+1 IteraMon n+1 Story User Login A User Story B Create album TradiMonally, development is sliced horizontally User Story C Share photos Sprint x IteraMon x User Story D Private albums but defers feedback (often, until its too late) 8
SoWware Components (modules/classes) Lme 2009 Share photos IteraMon n Create album Share photos IteraMon n+1 VerMcal slicing Login Create album Share photos IteraMon x Private albums results in earlier feedback 9
Work from the outside-足in
Outside-足in
One example at a Mme
One example at a Mme
Expressing Examples Given, When, Then And beyond
Given When Then Given <some iniMal context> When <something happens> Then <some expectaMon>
Given When Then Given <some iniMal context> [and some addiMonal context] When <something happens> [and something else happens] Then <some expectaMon> [and some more expectaMons]
A Typical IllustraMon Scenario: Login Successfully! Given I am on the home-page! When I enter the username antony! And I enter the password p4$$w0rd! And I click login! Then I should be logged in Whats wrong with this example?
A Be<er IllustraMon Scenario: Login Successfully! When I login as antony with the password p4$$w0rd! Then I should be logged in Why is it be<er?
Task Analysis A li<le UX for our BDD
≒ Pitching it right Goals e.g. Withdraw Cash ≒ Tasks IdenMfy to bank Request amount } Just right (inter)acLons } Insert Card Too Enter Pin low Press Withdraw Cash level Enter amount Press OK
For example When I attempt to add, the number 2 and the number 3! task } acMons h<p://cukesalad.info
Some nice side-足e鍖ects Encourages descripMon of UI interacMons in one place Makes it easier to execute scenarios via di鍖erent interfaces
Discussion QuesMons? Ideas? Feedback?
antony@riverglide.com @AntonyMarcano talktous@riverglide.com @RiverGlide/rs h<p://twi<er.com/RiverGlide/rs h<p://cukesalad.info #cukesalad h<p://RiverGlide.com @RiverGlide

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Behaviour Driven Development - Beyond given when then

  • 1. Behaviour Driven Development Beyond Given, When, Then Antony Marcano
  • 2. The Telephone Game h<p://www.brokenpicturetelephone.com/
  • 3. What is BDD? Beyond Given, When, Then
  • 4. BDD Origins The deeper I got into TDD, the more I felt that my own journey had been less of a wax-足on, wax-足o鍖 process of gradual mastery than a series of blind alleys. I remember thinking If only someone had told me that! I decided it must be possible to present TDD in a way that gets straight to the good stu鍖 and avoids all the piFalls. My response is behaviour-足driven development (BDD). Over Lme, BDD has grown to encompass the wider picture of agile analysis and automated acceptance tesLng. -足Dan North
  • 5. BDD Origins -足 Shortened Behaviour Driven Development (BDD) builds upon Test-足Driven Development (TDD) by formalising the good habits of the best TDD pracMMoners. The Cucumber Book, Aslak Helles淡y, Ma< Wynne
  • 6. Some Good Habits Slice VerMcally Work from the outside-足in One example at a Mme
  • 8. SoWware Components SoWware Components (modules/classes) (modules/classes) Lme Lme 2009 Sprint nn IteraMon Sprint n+1 IteraMon n+1 Story User Login A User Story B Create album TradiMonally, development is sliced horizontally User Story C Share photos Sprint x IteraMon x User Story D Private albums but defers feedback (often, until its too late) 8
  • 9. SoWware Components (modules/classes) Lme 2009 Share photos IteraMon n Create album Share photos IteraMon n+1 VerMcal slicing Login Create album Share photos IteraMon x Private albums results in earlier feedback 9
  • 10. Work from the outside-足in
  • 12. One example at a Mme
  • 13. One example at a Mme
  • 14. Expressing Examples Given, When, Then And beyond
  • 15. Given When Then Given <some iniMal context> When <something happens> Then <some expectaMon>
  • 16. Given When Then Given <some iniMal context> [and some addiMonal context] When <something happens> [and something else happens] Then <some expectaMon> [and some more expectaMons]
  • 17. A Typical IllustraMon Scenario: Login Successfully! Given I am on the home-page! When I enter the username antony! And I enter the password p4$$w0rd! And I click login! Then I should be logged in Whats wrong with this example?
  • 18. A Be<er IllustraMon Scenario: Login Successfully! When I login as antony with the password p4$$w0rd! Then I should be logged in Why is it be<er?
  • 19. Task Analysis A li<le UX for our BDD
  • 20. ≒ Pitching it right Goals e.g. Withdraw Cash ≒ Tasks IdenMfy to bank Request amount } Just right (inter)acLons } Insert Card Too Enter Pin low Press Withdraw Cash level Enter amount Press OK
  • 21. For example When I attempt to add, the number 2 and the number 3! task } acMons h<p://cukesalad.info
  • 22. Some nice side-足e鍖ects Encourages descripMon of UI interacMons in one place Makes it easier to execute scenarios via di鍖erent interfaces
  • 23. Discussion QuesMons? Ideas? Feedback?
  • 24. antony@riverglide.com @AntonyMarcano talktous@riverglide.com @RiverGlide/rs h<p://twi<er.com/RiverGlide/rs h<p://cukesalad.info #cukesalad h<p://RiverGlide.com @RiverGlide