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The LAZY Developer's Guide to BDD (with Cucumber)
This document provides a summary of behavior-driven development (BDD) and how to implement it using Cucumber. It discusses BDD principles like focusing on behaviors, delivering stakeholder value, and ensuring enough is done without overengineering. Cucumber is introduced as a tool that allows non-technical stakeholders to express application features in plain text for documentation, examples, and testing. The document outlines setting up Cucumber with features files, step definitions, and integrating it with a target application using a driver like Selenium.
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The LAZY Developer's Guide to BDD (with Cucumber)
- 1. A LAZY Developer's Guide to BDD (with ) ~ Ng Tze Yang (aka TY)
- 2. 2 weeks ago,i changed it to: Everyone gets a little of 's ♥ 2
- 3. A LAZY Developer's Guide to BDD (with ) 3
- 4. WTF is “LAZY”?? 4
- 5.
- 6. WTF is “TATFT”?? 6
- 7.
- 8. Why Not TATFT?? 8
- 9. Why Not TATFT?? * What is most important for a software ?? 9
- 10. Why Not TATFT?? * What is most important for a software ?? => Business Value 10
- 11. Why Not TATFT?? * What is most important for a software ?? => Business Value * How do we quantify BV ?? 11
- 12. Why Not TATFT?? * What is most important for a software ?? => Business Value * How do we quantify BV ?? => Behaviours 12
- 13. BDD ~ Behaviour DrivenDevelopment ~ 13
- 14. BDD ~ Behaviour DrivenDevelopment ~ “BDD facilitates agile development, which is an approach to develop functional software, within reasonable timeline, making everyone happy, without killing anyone, or burning down any bank.” 14
- 15.
- 16. BDD's Core Principles *It's all behaviour “ The business & technology people should be speaking the same words when referring to the same idea, there should not be any translator.” 16
- 17. BDD's Core Principles *It's all behaviour Behaviour: the addition of N values should yield the summation of them Example: the addition of 2 + 4 +1 should yield 8 17
- 18. BDD's Core Principles *It's all behaviour * Deliver stakeholder value “ Whatever u are doing, it should be delivering business value, or increasing ur ability to deliver value, if the activity doesn't acheive this, stop doing it” 18
- 19. BDD's Core Principles *It's all behaviour * Deliver stakeholder value “ Unit testing is important, as it makes refactoring & regression testing easier, which eases maintenace and enhance ur ability to deliver newer features faster” 19
- 20. BDD's Core Principles *It's all behaviour * Deliver stakeholder value * Enough is enough “ Do not overengineer, do not overdo upfront planning, analysis and design. Do just enough to get things started in the right direction” 20
- 21. BDD's Core Principles *It's all behaviour * Deliver stakeholder value * Enough is enough “ When i wanna go to sentosa from my AMK home, i just goto gothere.sg to do a quick check, and that's good enough, i don't need to get down to switching lanes on CTE, blah blah. ” 21
- 22. Cucumber ? Niceto Eat ?! 22
- 23. Cucumber ? Niceto Eat ?! * a tool for functional testing 23
- 24. Cucumber ? Niceto Eat ?! * a tool for functional testing * by Aslak HellesØy, & many other nice people 24
- 25. Cucumber ? Niceto Eat ?! * a tool for functional testing * by Aslak HellesØy, & many other nice people * allows non-technies to express app's functions in plain text 25
- 26. Cucumber ? Niceto Eat ?! * a tool for functional testing * by Aslak HellesØy, & many other nice people * allows non-technies to express app's functions in plain text * plain text serves as documentation & executable examples 26
- 27. Hmm .. PlainText ?! 27
- 28. A Prettier PlainText 28
- 29. The Title 29
- 30.
- 31. Guideline for theNarrative 31
- 32. Guideline for theNarrative * identify the stakeholder “ Eg. The system administrator” 32
- 33. Guideline for theNarrative * identify the stakeholder * describe the feature he wants “ Eg. Trashing of all invalid purchase orders in the system” 33
- 34. Guideline for theNarrative * identify the stakeholder * describe the feature he wants * the reason for wanting it “ Eg. Prevent data corruption” 34
- 35.
- 36.
- 37.
- 38. Given | When| Then 38
- 39. Given | When| Then * GIVEN ... setting up system to a known state “ Eg 1. Database setup ... Given the following users already exists” “ Eg 2. Visiting a Url ... Given I am on users management page” “ Eg 3. Ensure User's Login ... Given I already login as “HappyMan”” 39
- 40. Given | When| Then * GIVEN ... setting up system to a known state * WHEN ... exercising an event “ Eg. Pressing Button ... When I press “Help Me”” 40
- 41. Given | When| Then * GIVEN ... setting up system to a known state * WHEN ... exercising an event * THEN ... verifying an outcome “ Eg. Seeing a message ... Then I should see “Login Successful”” 41
- 42. Save & ExecuteIt !! * Save at: <PROJECT_ROOT> `~ features/ `- sign_up.feature 42
- 43. Save & ExecuteIt !! * Save at: <PROJECT_ROOT> `~ features/ `- sign_up.feature * Run with: #$ cucumber features 43
- 44. P1 P2 44
- 45.
- 46.
- 47.
- 48.
- 49.
- 50.
- 51.
- 52.
- 53. Save & ExecuteIt !! * Save as: <PROJECT_ROOT> `~ features/ `- steps.rb 53
- 54. Save & ExecuteIt !! * Save as: <PROJECT_ROOT> `~ features/ `- steps.rb * Run with: #$ cucumber features 54
- 55.
- 56.
- 57.
- 58. The Functional TestModel 58
- 59. The Generic Model Cucumber *cucumber exec * features/*.feature * features/*.rb 59
- 60. The Generic Model Cucumber *cucumber exec Target App * features/*.feature * features/*.rb 60
- 61. The Generic Model Cucumber *cucumber exec Target App * features/*.feature * features/*.rb Driver 61
- 62. The Generic WebappModel Cucumber * cucumber exec * features/*.feature * features/*.rb 62
- 63. The Generic WebappModel Cucumber Webapp * cucumber exec * web server * features/*.feature * deployed app * features/*.rb * web browser 63
- 64. The Generic WebappModel Cucumber Webapp * cucumber exec * web server * features/*.feature * deployed files * features/*.rb * web browser Driver * selenium (server+client) 64
- 65. FAST FOWARD (Completed: StepDefinitions) 65
- 66. Before After 66
- 67. Before After 67
- 68. Before After 68
- 69. Before After 69
- 70. Before After 70
- 71. A New *.rbFile <PROJECT_ROOT> `~ features/ `- selenium.rb 71
- 72.
- 73.
- 74.
- 75.
- 76.
- 77. OK, Let's RunIt !! #$ cucumber features 77
- 78.
- 79.
- 80. Run Selenium Server #$ selenium 80
- 81. Run Selenium Server #$ selenium 81
- 82.
- 83. Let's Try Again #$cucumber features 83
- 84.
- 85.
- 86. The Missing Part?? ~ Our Application ~ 86
- 87. FAST FOWARD AGAIN (Completed:Application) 87
- 88. Let's Run theWebapp #$ ruby app.rb 88
- 89. Let's Run theWebapp #$ ruby app.rb 89
- 90.
- 91. Let's Try OnceAgain #$ cucumber features 91
- 92. Let's Try OnceAgain #$ cucumber features 92
- 93.
- 94. Summing Up 1) Capturinguser's requirements in a feature file 94
- 95.
- 96.
- 97.
- 98.
- 99.
- 100.
- 101.
- 102.
- 103. Summing Up 1) Capturinguser's requirements in a feature file 2) Complete the missing step defintions 103
- 104. Step Definitions 104
- 105. Summing Up 1) Capturinguser's requirements in a feature file 2) Complete the missing step defintions 3) Implement the application 105
- 106. Useful Links * Cucumber'sWiki http://wiki.github.com/aslakhellesoy/cucumber * Cucumber's Homepage http://cukes.info/ * BDD @ Wikipedia 106
- 107.
- 108. THE END 108