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BDD in Action: Building Software Right and Building the Right Software

A common perception of behavior-driven development (BDD) focuses on test automation with Cucumber-style “Given..When..Then” scenarios. But this is just the tip of the iceberg: in fact BDD ranges from requirements discovery and description through to driving technical design and implementation; helping testers focus their testing efforts more effectively; and even providing reliable, useful, and accurate technical documentation. This session discusses what BDD is about, its benefits, and how it affects development teams and processes. You will see how JVM teams can effectively implement BDD with tools such as JBehave, Cucumber, Thucydides, and Spock. Come learn how much more there is to BDD than just “Given..When..Then.”

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BDD in Action: Building Software Right and Building the Right Software
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BDD in Action: Building Software Right and Building the Right Software

  • 1. BDD in Action Building Software Right Building the Right Software
  • 2. Miyamoto Musashi Japan 1584 – 1645
  • 3. Consultant Tr a i n e r Mentor Author Speaker Coder John Ferguson Smar t
  • 4. Consultant Tr a i n e r Mentor Author Speaker Coder John Ferguson Smar t
  • 7. What is BDD A typical BDD workflow
  • 8. What is BDD A typical BDD workflow What tools should I use?
  • 9. What is BDD A typical BDD workflow What tools should I use? Effec@ve BDD automa@on
  • 10. What is BDD A typical BDD workflow What tools should I use? Effec@ve BDD automa@on BDD Gotchas
  • 11. So what is this BDD thing?
  • 12. So what is this BDD thing? Using examples
  • 13. So what is this BDD thing? Using examples a shared understanding
  • 14. So what is this BDD thing? Using examples a shared understanding software that matters
  • 15. So what is this BDD thing? BDD
  • 16. So what is this BDD thing? BDD Collaboration
  • 17. So what is this BDD thing? BDD Hunting out value Collaboration
  • 18. So what is this BDD thing? BDD Hunting out value Collaboration Building the right software
  • 19. So what is this BDD thing? Hunting out value Automated Acceptance BDD Criteria Collaboration Building the right software
  • 20. So what is this BDD thing? Hunting out value Automated Acceptance BDD Criteria API and code design Collaboration Building the right software
  • 21. So what is this BDD thing? Building the right software Hunting out value Automated Acceptance BDD Criteria API and code design Collaboration Building the software right
  • 22. So what is this BDD thing? Building the right software Hunting out value Automated Acceptance BDD Criteria API and code design Collaboration Living Documentation Building the software right
  • 23. The business owner tells the business analyst what he wants 1 2 The business analyst writes a requirements document 3 The developer translates the requirements into software 4 The tester translates the requirements into test cases 5 The technical writer translates the software into functional and technical documentation BDD in a nutshell A traditional development process
  • 24. The business owner tells the business analyst what he wants 1 2 The business analyst writes a requirements document 3 The developer translates the requirements into software 4 The tester translates the requirements into test cases 5 The technical writer translates the software into functional and technical documentation BDD in a nutshell A traditional development process
  • 25. The business owner tells the business analyst what he wants 1 2 The business analyst writes a requirements document 3 The developer translates the requirements into software 4 The tester translates the requirements into test cases 5 The technical writer translates the software into functional and technical documentation BDD in a nutshell A traditional development process
  • 26. The business owner tells the business analyst what he wants 1 2 The business analyst writes a requirements document 3 The developer translates the requirements into software 4 The tester translates the requirements into test cases 5 The technical writer translates the software into functional and technical documentation BDD in a nutshell A traditional development process
  • 27. The business owner tells the business analyst what he wants 1 2 The business analyst writes a requirements document 3 The developer translates the requirements into software 4 The tester translates the requirements into test cases 5 The technical writer translates the software into functional and technical documentation BDD in a nutshell A traditional development process
  • 28. The business owner tells the business analyst what he wants 1 2 The business analyst writes a requirements document 3 The developer translates the requirements into software 4 The tester translates the requirements into test cases 5 The technical writer translates the software into functional and technical documentation BDD in a nutshell A traditional development process
  • 29. The business owner tells the business analyst what he wants 1 2 The business analyst writes a requirements document 3 The developer translates the requirements into software 4 The tester translates the requirements into test cases 5 The technical writer translates the software into functional and technical documentation BDD in a nutshell A traditional development process
  • 30. The business owner tells the business analyst what he wants 1 2 The business analyst writes a requirements document 3 The developer translates the requirements into software 4 The tester translates the requirements into test cases 5 The technical writer translates the software into functional and technical documentation BDD in a nutshell A traditional development process
  • 31. The business owner tells the business analyst what he wants 1 2 The business analyst writes a requirements document 3 The developer translates the requirements into software 4 The tester translates the requirements into test cases 5 The technical writer translates the software into functional and technical documentation BDD in a nutshell A traditional development process
  • 32. The business owner tells the business analyst what he wants 1 2 The business analyst writes a requirements document 3 The developer translates the requirements into software 4 The tester translates the requirements into test cases 5 The technical writer translates the software into functional and technical documentation BDD in a nutshell A traditional development process
  • 33. The business owner tells the business analyst what he wants 1 2 The business analyst writes a requirements document 3 The developer translates the requirements into software 4 The tester translates the requirements into test cases 5 The technical writer translates the software into functional and technical documentation BDD in a nutshell A traditional development process
  • 34. The business owner and the business analyst have a conversation about what he needs. 1 2 3 BDD in a nutshell The business analyst, the developer and the tester elaborate the requirements together. 4 The tester uses these scenarios as the basis for her tests 5 The automated tests provide feedback on progress and help document the application The scenarios guide the developer and act as automated tests They define requirements as structured, English-language format "scenarios" A BDD development process
  • 35. The business owner and the business analyst have a conversation about what he needs. 1 2 3 BDD in a nutshell The business analyst, the developer and the tester elaborate the requirements together. 4 The tester uses these scenarios as the basis for her tests 5 The automated tests provide feedback on progress and help document the application The scenarios guide the developer and act as automated tests They define requirements as structured, English-language format "scenarios" A BDD development process
  • 36. The business owner and the business analyst have a conversation about what he needs. 1 2 3 BDD in a nutshell The business analyst, the developer and the tester elaborate the requirements together. 4 The tester uses these scenarios as the basis for her tests 5 The automated tests provide feedback on progress and help document the application The scenarios guide the developer and act as automated tests They define requirements as structured, English-language format "scenarios" A BDD development process
  • 37. The business owner and the business analyst have a conversation about what he needs. 1 2 3 BDD in a nutshell The business analyst, the developer and the tester elaborate the requirements together. 4 The tester uses these scenarios as the basis for her tests 5 The automated tests provide feedback on progress and help document the application The scenarios guide the developer and act as automated tests They define requirements as structured, English-language format "scenarios" A BDD development process
  • 38. The business owner and the business analyst have a conversation about what he needs. 1 2 3 BDD in a nutshell The business analyst, the developer and the tester elaborate the requirements together. 4 The tester uses these scenarios as the basis for her tests 5 The automated tests provide feedback on progress and help document the application The scenarios guide the developer and act as automated tests They define requirements as structured, English-language format "scenarios" A BDD development process
  • 39. The business owner and the business analyst have a conversation about what he needs. 1 2 3 BDD in a nutshell The business analyst, the developer and the tester elaborate the requirements together. 4 The tester uses these scenarios as the basis for her tests 5 The automated tests provide feedback on progress and help document the application The scenarios guide the developer and act as automated tests They define requirements as structured, English-language format "scenarios" A BDD development process
  • 40. The business owner and the business analyst have a conversation about what he needs. 1 2 3 BDD in a nutshell The business analyst, the developer and the tester elaborate the requirements together. 4 The tester uses these scenarios as the basis for her tests 5 The automated tests provide feedback on progress and help document the application The scenarios guide the developer and act as automated tests They define requirements as structured, English-language format "scenarios" •Specifica)ons are elaborated collabora)vely •Specifica)ons use a common language •Executable specifica)ons provide fast feedback
  • 41. A typical BDD workflow
  • 42. A typical BDD workflow Frequent Flyer Application Goal: Encourage travellers to fly with Flying High airlines more often by allowing them to cumulate Frequent Flyer points that they can spend on cheaper flights. Goals
  • 43. A typical BDD workflow Frequent Flyer Application Goal: Encourage travellers to fly with Flying High airlines more often by allowing them to cumulate Frequent Flyer points that they can spend on cheaper flights. Goals Earning points from flights Capabili9es Earning points from spending with partners Viewing points earned Spending points on bookings
  • 44. A typical BDD workflow Frequent Flyer Application Goal: Encourage travellers to fly with Flying High airlines more often by allowing them to cumulate Frequent Flyer points that they can spend on cheaper flights. Goals Earning points from flights Capabili9es Earning points from spending with partners Viewing points earned Spending points on bookings Viewing current points balance Features View points needed to achieve the next status level Calculating points needed for a given destination
  • 45. A typical BDD workflow
  • 46. A typical BDD workflow Calculating points needed for a given destination As a traveller I want to know how many points I need to go to a given destination So that I can plan my next trip with Flying High Airlines Feature
  • 47. A typical BDD workflow Calculating points needed for a given destination As a traveller I want to know how many points I need to go to a given destination So that I can plan my next trip with Flying High Airlines Feature Acceptance Criteria -Need 2 points per km -Members can calculate points needed on their account home page Acceptance Criteria
  • 48. A typical BDD workflow Calculating points needed for a given destination As a traveller I want to know how many points I need to go to a given destination So that I can plan my next trip with Flying High Airlines Feature Acceptance Criteria -Need 2 points per km -Members can calculate points needed on their account home page Acceptance Criteria
  • 49. A typical BDD workflow Calculating points needed for a given destination As a traveller I want to know how many points I need to go to a given destination So that I can plan my next trip with Flying High Airlines Feature Acceptance Criteria -Need 2 points per km -Members can calculate points needed on their account home page Acceptance Criteria Automated Acceptance Criteria
  • 50. A typical BDD workflow
  • 51. A typical BDD workflow Automated Acceptance Criteria
  • 52. A typical BDD workflow Automated Acceptance Criteria Automated Acceptance Tests
  • 53. A typical BDD workflow Automated Acceptance Tests
  • 54. A typical BDD workflow Automated Acceptance Tests Applica9on Code
  • 55. A typical BDD workflow Automated Acceptance Tests Applica9on Code
  • 56. A typical BDD workflow Automated Acceptance Tests Applica9on Code Low level specifica9ons
  • 57. A typical BDD workflow
  • 58. A typical BDD workflow “But what are the deliverables?
  • 59. A typical BDD workflow “But what are the deliverables? Meaningful feedback on what requirements have (and have not) been delivered
  • 60. An incremental approach “But what are the deliverables?
  • 61. An incremental approach “But what are the deliverables? Descrip9on of each feature with an example of how it behaves
  • 62. An incremental approach “But what are the deliverables?
  • 63. An incremental approach “But what are the deliverables? …complete with illustra9ons
  • 64. An incremental approach “But what are the deliverables?
  • 65. An incremental approach “But what are the deliverables? How was each feature tested?
  • 66. An incremental approach “But what are the deliverables?
  • 67. An incremental approach “But what are the deliverables? Documenta9on about what you plan to deliver in each release
  • 68. An incremental approach “But what are the deliverables?
  • 69. An incremental approach “But what are the deliverables? Useful low-­‐level technical documenta9on with liRle overhead
  • 70. An incremental approach “But what are the deliverables?
  • 71. An incremental approach “But what are the deliverables? …and targeted automated regression tests
  • 74. Collaboration before Automation “Having the conversa/on is more important than recording the conversa/on is more important than automa/ng the conversa/on” -­‐ Liz Keogh
  • 77. High-level BDD Reporting for non-developers as well as developers …
  • 78. High-level BDD Reporting for non-developers as well as developers Communicate about features that business owners will understand and find meaningful …
  • 79. High-level BDD Reporting for non-developers as well as developers Communicate about features that business owners will understand and find meaningful Higher automation and maintenance costs …
  • 86. Living documentation! Requirements reporting! Encourages good test architecture! Good WebDriver integration! Works with other BDD tools
  • 87. +
  • 88. +
  • 89. +
  • 90. +
  • 91. +
  • 92. +
  • 93. +
  • 94. +
  • 95. +
  • 97. A high-­‐level BDD tool should Produce business-­‐readable results Fit smoothly into your build pipeline Integrate with your development infrastructure Allow developers to collaborate with testers to implement and refactor the automa9on code
  • 99. Tips for more effec)ve BDD Test Automa)on
  • 100. Tip #1 - Use Layers Business Rules Business Flow Page/Component interac9ons Page/Component details
  • 101. Tip #1 - Use Layers Business Rules Business Flow Page/Component interac9ons Page/Component details
  • 102. Tip #1 - Use Layers Business Rules Business Flow Page/Component interac9ons Page/Component details
  • 103. Tip #1 - Use Layers Business Rules Business Flow Page/Component interac9ons Page/Component details
  • 104. Tip #1 - Use Layers Business Rules Business Flow Page/Component interac9ons Page/Component details
  • 105. Tip #2 - Favour non-UI tests where possible
  • 106. Tip #3 - Know when not to automate This slide is left intentionally blank
  • 108. Low-level BDD Technical documentation for other developers spock RSpec
  • 109. Low-level BDD Technical documentation for other developers spock RSpec
  • 110. Low-level BDD Technical documentation for other developers Implementation details that business owners may not be interested in spock RSpec
  • 111. Low-level BDD Technical documentation for other developers Implementation details that business owners may not be interested in spock RSpec
  • 112. Low-level BDD Technical documentation for other developers Implementation details that business owners may not be interested in Faster to write and easier to maintain spock RSpec
  • 113. Low-level BDD Good naming conven9ons are the first step towards BDD
  • 114. Low-level BDD Good naming conven9ons are the first step towards BDD
  • 116. Low-level BDD spock RSpec Readable executable specifica9ons in Groovy
  • 118. Low-level BDD spock RSpec Great support for data-­‐driven tests
  • 119. Low-level BDD spock RSpec Great support for data-­‐driven tests
  • 121. Low-level BDD spock RSpec Powerful and light-­‐weight stubbing and mocking
  • 122. Low-level BDD spock RSpec Powerful and light-­‐weight stubbing and mocking
  • 123. Low-level BDD spock RSpec Powerful and light-­‐weight stubbing and mocking
  • 125. Low-level BDD spock RSpec Makes very readable specifica9ons
  • 126. Low-level BDD spock RSpec Makes very readable specifica9ons
  • 128. Low-level BDD Lambda-Behave Low-­‐level BDD library for Java 8
  • 130. Low-level BDD Lambda-Behave Data-­‐driven specifica9ons
  • 131. Low-level BDD Lambda-Behave Data-­‐driven specifica9ons
  • 133. Low-level BDD Lambda-Behave Generated test data
  • 134. Low-level BDD Lambda-Behave Generated test data
  • 136. A low-­‐level BDD tool should Be highly readable Be developer-­‐friendly Make it easy to think in terms of specifica9ons, not tests Encourage fast feedback cycles You may need several!
  • 137. BDD Gotchas 1 2 3 4
  • 138. BDD Gotchas 1 2 3 An)-­‐paFern 1 4 The business analyst writes the scenarios and then gives them to the other team members.
  • 139. 1 2 3 BDD Gotchas 4
  • 140. 1 2 3 BDD Gotchas 4 An)-­‐paFern 2 The tester writes the scenarios at the end to implement an automated test suite.
  • 141. 1 2 3 4 5 BDD Gotchas
  • 142. 1 2 3 4 5 BDD Gotchas An)-­‐paFern 3 The “Three Amigos” sessions don’t result in usable scenarios, so the developer invents them a?erwards.
  • 143. 1 2 3 4 5 BDD Gotchas An)-­‐paFern 3 The “Three Amigos” sessions don’t result in usable scenarios, so the developer invents them a?erwards.
  • 144. 1 2 3 4 5 BDD Gotchas
  • 145. 1 2 3 4 5 BDD Gotchas An)-­‐paFern 4 The scenarios are too UI-­‐centric or detail-­‐focused, and neglect to express the core business value.
  • 146. Book signings! Digital Guru bookstore Hilton Hotel, 2nd Level lobby Thursday, 12:30-­‐1:00pm