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allistingoftheactiontestusingbothMockStrutsTestCaseandEasyMockpublicclassSimpleActionTestextendsMockStrutsTestCase
implementsStrutsActionPreExecuteListener{
//2.MocktheclassthatActiondependson
privateMockControlmockControl等于MockControl.createControl(ActionService.class),
privateActionServiceserviceMock等于(ActionService)mockControl.getMock(),
//1.SetupMockStrutsTestCase
protectedvoidsetUp()throwsException{
super.setUp(),
setRequestPathInfo("/action/simpleAction"),
}
protectedvoidtearDown()throwsException{
super.tearDown(),
mockControl.reset(),
}
//4.InjectthemockintotheAction
publicvoidpreActionExecuteOccured(Actionaction){
((SimpleAction)action).setService(serviceMock),
}
publicvoidtestSuccess(){
//3.Setmockexpectations
serviceMock.serveAction(),
mockControl.setReturnValue(true),
mockControl.replay(),
//5.Proceedwithtestandverifications
actionPerform(),
verifyForward("success"),
verifyNoActionErrors(),
mockControl.verify(),
}
publicvoidtestFailure(){
//detailsskipped
}
}
Fourpossiblemultiplicityrelationshipsexistbetweenactionsandtheservicestheydependon:
Eachactiondependsononeservice.
Eachactiondependsonmultipleservices.
Multipleactionsdependononeservice.
Multipleactionsdependonmultipleservices.
ThesolutionIpresentherehastheflexibilitytosupportallfourscenarioswithrelativeeasebecausemockcreation,expectationsetup,andmockinjectioncanallbeperformedintheindividualtestclasses.
CanyouavoidusingthelistenerinterfacesothatmockinjectionisdoneinsideStrutsActionPreExecuteNotifierItseemstomaketestclassimplementationevensimpler.However,similartotheearlierOOPsolution,writingmultipleaspectstocreatedifferentmocksandsetupdifferentmockexpectationswouldprovenecessary.Localizingthemockcreationandsetupinindividualtestclassesasmadepossiblebythelistenerapproachismoreconvenient.
ThepowerofAOP
SomeonemayeupwithagoodOOPsolutiontoourintegrationproblem.However,itwouldlikelyrequirein-depthunderstandingofStrutsandStrutsTestCase,andanon-trivialamountofeffort.TheintegrationgapbetweenthetwotestingframeworksisthedifficultyingainingaccesstotheStrutsactioninstancebeforeitsexecution.Afteridentifyingthefundamentalcause,theAOPsolutionnaturallyemergesfromtheproblemdescription.InsteadofthemoreplexsolutionrequiredwithtraditionalOOP,AOPallowsustomapoursolutionmorecloselytotheproblemspace.
AOP'smagiclieswithitsjoinpointmodel.Itletsyoucutthroughintermediaries,suchasActionServletandRequestProcessor,andgostraighttotheheartoftheproblem.Theeconomicalwayofaddressingcrosscuttingconcernsgivesdeveloperstheexpressivepowertodesignintuitiveandsimplersolutions.AOPisapowerfulprogrammingapproachthatfillstheholesleftbytraditionalOOP.Whenappliedcorrectlytotherighttypeofproblems,itimprovescodemodularity,resultingincodethatiscleanerandeasiertounderstand.Hopefully,thisarticlenotonlyhelpedyouunittestyourStrutsapplications,butalsogaveyounewappreciationforsomeofthesignificantbenefitsthatAOPoffers.
AuthorBio
WalterJiaisanindependentconsultantspecializinginenterpriseapplicationdevelopment.Heisalwaysonthelookoutforbettersolutionswhiletakingapragmaticapproachtohelpingclientsbuildqualitysoftwareandavoidunnecessarycosts.HeisbasedinVancouverCanada.
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