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ID:58465553
大小:495.50 KB
页数:79页
时间:2020-09-07
《软件工程课件(英文版)unit 6.ppt》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、Unit6SoftwareTestingAssuringthatasoftwaresystemmeetsauser'sneedsVerification:"Arewebuildingtheproductright"ThesoftwareshouldconformtoitsspecificationValidation:"Arewebuildingtherightproduct"ThesoftwareshoulddowhattheuserreallyrequiresVerificationvsvalidationIsawholelife-cycleprocess-V&Vmust
2、beappliedateachstageinthesoftwareprocess.HastwoprincipalobjectivesThediscoveryofdefectsinasystemTheassessmentofwhetherornotthesystemisusableinanoperationalsituation.TheV&VprocessSoftwareinspectionsConcernedwithanalysisofthestaticsystemrepresentationtodiscoverproblems(staticverification)Mayb
3、esupplementbytool-baseddocumentandcodeanalysisSoftwaretestingConcernedwithexercisingandobservingproductbehaviour(dynamicverification)ThesystemisexecutedwithtestdataanditsoperationalbehaviourisobservedStaticanddynamicverificationStaticanddynamicV&VCanrevealthepresenceoferrorsNOTtheirabsenceA
4、successfultestisatestwhichdiscoversoneormoreerrorsTheonlyvalidationtechniquefornon-functionalrequirementsShouldbeusedinconjunctionwithstaticverificationtoprovidefullV&VcoverageProgramtestingDefecttestingTestsdesignedtodiscoversystemdefects.Asuccessfuldefecttestisonewhichrevealsthepresenceo
5、fdefectsinasystem.Statisticaltestingtestsdesignedtoreflectthefrequenceofuserinputs.Usedforreliabilityestimation.TypesoftestingV&VgoalsVerificationandvalidationshouldestablishconfidencethatthesoftwareisfitforpurposeThisdoesNOTmeancompletelyfreeofdefectsRather,itmustbegoodenoughforitsintendedus
6、eandthetypeofusewilldeterminethedegreeofconfidencethatisneededV&VconfidenceDependsonsystem’spurpose,userexpectationsandmarketingenvironmentSoftwarefunctionThelevelofconfidencedependsonhowcriticalthesoftwareistoanorganisationUserexpectationsUsersmayhavelowexpectationsofcertainkindsofsoftwareMa
7、rketingenvironmentGettingaproducttomarketearlymaybemoreimportantthanfindingdefectsintheprogramDefecttestinganddebuggingaredistinctprocessesVerificationandvalidationisconcernedwithestablishingtheexistenceofdefectsinaprogramDebuggingisconcerne
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