behaviourtest driven development-btdd行为测试驱动开发.pptx

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behaviourtest driven development-btdd行为测试驱动开发.pptx

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BehaviorDrivenDevelopment2013.9

BehaviorDrivenDevelopment(BDD)

BehaviorDrivenDevelopment(BDD)BehaviourDrivenDevelopmentisanextension/revisionofTestDrivenDevelopment.Itspurposeistohelpthefolksdevisingthesystem(i.e.,thedevelopers)identifyappropriateteststowrite--thatis,teststhatreflectthebehaviourdesiredbythestakeholders.Theeffectendsupbeingthesame--developthetestandthendevelopthecode/systemthatpassesthetest.ThehopeinBDDisthatthetestsareactuallyusefulinshowingthatthesystemmeetstherequirements.ProcessWriteatestRuntests,watchthenewtestfailMakethetestpassRefactortoremoveduplicationandotherstuff.

UnitTestingwithJavaScriptJavaScriptunittestingideaseemsbitdifficultorunnecessaryformanydevelopers.Thiscouldbebecauseofthefollowing–Projectdoesnotseembigenoughtowarrantwritingtests.Complexityoftheapplicationmightseembigenoughtowritetestsfor.Variousotherfactorslike–JavaScriptScopingAsynchronousXHRrequestsDOMmanipulationsetc.UnitTestingisreallyunnecessaryfor–Reducingthelevelofbugsinproductioncode.Savingdevelopmenttime.Automatedtestscanberunasfrequentlyasrequired.Makingcodeeasiertochange/refactor.ImprovingdesignofcodeespeciallywithTest-DrivenDevelopment.Forcingustoconfronttheproblemheadon.Improvingconfidencelevelinwrittencode.Measuringcompletionofcode.

UnitTestingTermsDefinitions

Assertion:Astatementthatverifiesthatsomethingistrueequal(1,1,String1andnumber1havethesamevalue);Test:Afunctionthatexecutesoneormoreassertionsinordertoverifyassumptionsaboutacodeunit.test(atest,function(){equal(1,1,String1andnumber1havethesamevalue);});Testsuite:Acollectionoftests.Groupingtestsmaybeusefulforseparatingtime-consumingtestsfromtherest.Stub:Stubobjectsprovideavalidresponse,butitsstatic--nomatterwhat