Driving Behaviour with Cucumber

This is a talk I gave at the Great Lakes Software Excellence Conference in 2009 on BDD and Cucumber.

Transcript

1. Driving Behaviour
   with
   Cucumber
   Zach Dennis
   Mutually Human Software
   www.mutuallyhuman.com
   

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3. later...
   ...still joyful
   

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4. a framework for writing and
   executing high level descriptions
   of your software’s behavior
   

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7. Cucumber
   is not a low level
   testing/specification
   framework.
   

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8. Cucumber is a
   BDD tool
   

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9. BDD was reframing of TDD
   

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10. It has evolved into its own
    

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11. Dan North’s
    3 Principles of BDD
    

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12. 1. Enough is enough
    

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13. 2. Deliver stakeholder value
    

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14. 3. It’s all behaviour
    

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15. how
    

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17. I want ...
    

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18. ok, why?
    

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20. In order to reduce time managing contacts
    users should be able to
    search for contacts within their account
    

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21. In order to reduce time managing contacts
    users should be able to
    search for contacts within their account
    value
    

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22. In order to reduce time managing contacts
    users should be able to
    search for contacts within their account
    role
    

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23. In order to reduce time managing contacts
    users should be able to
    search for contacts within their account
    behaviour
    

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24. In order to reduce time managing contacts
    users should be able to
    search for contacts within their account
    searching contacts
    

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25. searching contacts details
    

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26. searching contacts details
    Searching by name
    

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27. searching contacts details
    Searching by name
    Searching by partial name
    

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28. searching contacts details
    Searching by name
    Searching by partial name
    Searching for non-existent person
    ...
    

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29. searching contacts details
    Searching by partial name
    Given John Smith exists
    And I’ve logged in as a user
    When I search for Jo
    Then I should see John Smith is found
    

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30. Organizing
    

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31. Project Management
    Tools
    

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33. Code
    Stories Acceptance Criteria
    Today
    

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34. Code
    Stories Acceptance Criteria
    Near Distant Future
    

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35. Code
    Stories Acceptance Criteria Future
    

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36. Stories Acceptance Criteria
    Code
    

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38. identify the behaviour first
    

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39. everything else
    

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40. Outside-In
    

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41. UX/IA/IxD
    Views
    Controllers
    Models
    Database
    

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42. UX, IA, IxD
    

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43. Views
    

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44. Controller
    

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45. Models
    

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46. Database
    

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47. An Example
    

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48. In order to reduce time managing contacts
    users should be able to
    search for contacts within their account
    

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49. searching contacts details
    Searching by partial name
    Given John Smith exists
    And I’ve logged in as a user
    When I search for Jo
    Then I should see John Smith is found
    

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50. View Slide

51. feature title
    

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52. narrative
    

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53. notes
    

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54. acceptance
    criteria
    

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55. scenario title
    

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56. steps
    

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57. Gherkin
    

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58. PROJ_ROOT/
    features/
    step_definitions/
    support/
    searching_contacts.feature
    lib/
    test/
    

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59. cucumber features/searching_contacts.feature
    executable
    

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62. pending steps
    

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63. file/line numbers
    

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64. step definition
    snippets
    

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66. Given “John Smith” exists
    first step
    

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67. PROJ_ROOT/
    features/
    step_definitions/
    support/
    searching_contacts.feature
    lib/
    test/
    people_steps.rb
    

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68. features/step_definitions/people_steps.rb
    

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69. watch it fail
    

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70. watch it fail
    backtrace
    

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72. make it pass
    

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73. step becomes
    method
    invocation
    Given “John Smith” exists
    Given /^([^“]+)” .../
    step definition
    becomes method
    definition
    

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74. capture groups become arguments
    

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75. And I’ve logged in as a user
    2nd step
    

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76. features/step_definitions/people_steps.rb
    

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77. watch it fail
    

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79. make it pass
    

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80. When I search for “Jo”
    3rd step
    

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81. features/step_definitions/search_steps.rb
    

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82. watch it fail
    

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83. add routes
    

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84. still failing
    

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85. add controller
    

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86. still failing
    

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87. add view
    

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88. still failing
    

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89. add search action
    

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90. still failing
    

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91. add the model
    

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92. made it pass
    

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93. Then I should see “John Smith” is found
    last step
    

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94. features/step_definitions/people_steps.rb
    

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96. make it pass
    

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98. Rinse
    Repeat
    Lather
    

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99. Stories In
    Features Out
    

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102. features - customer audience
     tests/specs - developer audience
     

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103. accurate,
     readable,
     executable,
     features
     

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105. step tables
     

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108. table#raw
     

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110. table#hashes
     

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112. table#rows_hash
     

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113. scenario
     outlines
     

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118. multi-line
     strings
     

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120. background
     

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123. tags
     tags
     

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126. cucumber --tags @search, @wip
     

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127. cucumber --tags ~@search,@wip
     

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128. Hooks
     Transforms
     Framework
     Agnostic
     Wire Protocol
     Profiles
     

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129. .NET - cuke4nuke
     

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130. steps in .NET
     

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131. JVM - cuke4duke
     

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132. steps in java
     

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133. steps in groovy
     

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134. steps in scala
     

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136. Resources
     • http://www.cukes.info
     • http://github.com/aslakhellesoy/cucumber
     • http://github.com/aslakhellesoy/cuke4duke
     • http://github.com/richardlawrence/Cuke4Nuke/
     

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