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Patterns for Scripted Acceptance Test-Driven Development
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Patterns for Scripted Acceptance Test-Driven Development

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introduces a series of related patterns to be used in an acceptance testdrivendevelopment (ATDD) approach to software development using scripts. ATDDuses executable client-readable acceptance tests …

introduces a series of related patterns to be used in an acceptance testdrivendevelopment (ATDD) approach to software development using scripts. ATDDuses executable client-readable acceptance tests written in the form of scripts as thekey analysis artifacts that guide software development and presents a number ofadvantages over traditional analysis artifacts – texts and diagrams. They include abetter bridging of communication gaps between clients and developers, prevention offeature creep and synchronization between analysis changes and the code beingwritten.

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  • Example:In a Monopoly game, you need to test if a player is thrown out of the game afterfalling on a series of tax places and taking a series of actions that decrease hismoney. If you use tables, you will need a separate table for every command you use.
  • Example:generateReport output="report.txt"# equalFiles is a command in EasyAccept that tests if# two files have the exact same contentequalFiles templates\\reportTemplate.txt report.txt
  • Example:# creating an employee - script1.txtclearEmployeeDatabaseexpecterror "employee doesn't exist" getEmployeeSalary \\employeeName="John Doe"createEmployeeemployeeName="John Doe" salary=1500expect 1500 getEmployeeSalaryemployeeName="John Doe"saveEverythingAndCloseProgram# restart is an EasyAccept commandrestart# checking persistenceexpect 1500 getEmployeeSalaryemployeeName="John Doe"
  • # script 1executeScript sampleDatabaseSetup.txt… and then do the tests you want# script 2executeScript sampleDatabaseSetup.txt… and then do a number of different tests
  • # the tests below should be unit testsexpect 25 getBQueueNodeFatherIndexexpectError “Code #432653: unexpected fault for the middleware connection”getCORBASkeletonMiddlwareProperty

Transcript

  • 1. Patterns for ScriptedAcceptance Test-Driven Development Fang Liu Ider Zheng Pooja Gore 1
  • 2. Intent Patterns for acceptance test-driven development (ATDD) using scripts Approaches to cope with the challenges 2
  • 3. ContextATDD consists of Script Languages o Allows control of one or more application Business objects o manipulated by the program which make sense to the client o hidden to the client Non-Business Objects 3
  • 4. Problem Client must understand and review the tests o Should be imbued with a testing culture o A learning curve is associated with the approach 4
  • 5. Interrelated Patterns
  • 6. Test Creation PatternsTest Flow Creator Destroyer Limit Command TableBreaker Errors TesterWorkflow Template Persistence Tester Tester Tester
  • 7. Test Flow To verify if a given software property results as expected after a given action
  • 8. Three Steps for Test Flow Step 1: o Build a scenario you want to test Step 2: o Operate the program with the desired action Step 3: o Check the new program’s state.
  • 9. Creator & Destroyer To test if a business object has been successfully created or removed in the program Business object creation and destruction are common operations in test scripts
  • 10. Steps for Construction CheckObject Not •Otherwise, exception or do nothing Exist Create Object Check •Otherwise, exception or go back creation Object Exist step Validate the property of Object
  • 11. Steps for Destruction Check •Otherwise, do nothingObject Exist Destroy Object Check •Otherwise, exception Object Not or go back destroy step Exist Validate double Destruction
  • 12. Limit Breaker To test a business object or program flow that has limits (ranges or sets of allowed values)
  • 13. Limit Breaker Always precisely demarcate limits by giving examples of inner and outer bounds. Make sure values immediately out of the bounds throw errors, and limit inbound values dont. In general, tests for the immediate limits are enough to indicate to the developer that further values aren’t acceptable, even if the tests don’t explicitly list all of them.
  • 14. Command Errors Created a new command to incorporate in the script language and will start writing tests with it
  • 15. Command Errors Test coverage is difficult to attain if you don’t approach testing systematically When thinking on a new command to add to the script language, you often think about tests that will involve this command, including anomalous uses; A system should be able to identify a misuse of one of its operations and may even give clues about the problem cause
  • 16. Table Tester To test extensive lists of features for multiple business objects of the same kind, or multiple examples to test formulas (calculations) To declare business rules in a formulaic manner
  • 17. Table Tester
  • 18. Workflow Tester Context Test a workflow Problem o Tables become too verbose o Such tables make script understanding and maintenance difficult Forces A workflow is sequential in nature Solution Use commands in sequence instead of tables
  • 19. Template Tester Context Testing massive textual or non-textual content Problem o Massive textual content makes a script unintelligible o Non-textual content can only be included in a script through an IDE Forces Templates for test cases can be generated using software Solution o Divert the contents to be tested to outside the script o And use a template to compare it with Related Patterns Test Flow
  • 20. Persistence Tester Context Test if data entered in the program is persistent Problem Lack of a systematic approach to testing persistence Forces Setting up a scenario for persistence can often be reused Solution o The first part, add data in a program o The second part , check if data is retained Related Patterns Test Flow
  • 21. Test Organization Patterns Build Only Business Summarizer Objects Commentor
  • 22. Build Summarizer Context Similar test used frequently in a script Problem Repetition of the same test sequence, making script verbose Forces Commonly used sequence can be summarized in an expressive command Solution Set commonly used tests a separate single test sequence
  • 23. Only Business Objects Context Tests include Non-business objects Problem Tests for non-business objects are unintelligible for the client Forces o Client’s understanding of all Tests is important o Testing non-business objects is equally important Solution o Test only business objects in an acceptance test script o Test all Non-Business Objects with Unit Test
  • 24. Commentor Context Developer fails to understand a designed test Problem o Development stalls o A bug or wrong requirement may be introduced o Inconsistent Test Comments Forces Communicator between Client and Developer Solution o Use Comments o Update Comments
  • 25. Test Application Patterns Client TemplateAssertion Generator
  • 26. Client Assertion Context o Find a potential wrong test Problem o If bugs are changed by developers, feature creep will emerge o If bugs are not found, clients disappointed Forces o Clients must review tests Solutions  No test should be modified without the client’s consent 27
  • 27. Template Generator Context Problem o Becomes harder to find test cases Solution  Exam the presented results 28
  • 28. Testing tools Most widely known o FIT (Framework for Integrated Testing) Others o EasyAccept o Exactor
  • 29. THANK YOU! 30