软件工程课件(英文版)unit 6.ppt

软件工程课件(英文版)unit 6.ppt

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时间:2020-09-07

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1、Unit6SoftwareTestingAssuringthatasoftwaresystemmeetsauser'sneedsVerification: "Arewebuildingtheproductright"ThesoftwareshouldconformtoitsspecificationValidation: "Arewebuildingtherightproduct"ThesoftwareshoulddowhattheuserreallyrequiresVerificationvsvalidationIsawholelife-cycleprocess-V&Vmust

2、be appliedateachstageinthesoftwareprocess.HastwoprincipalobjectivesThediscoveryofdefectsinasystemTheassessmentofwhetherornotthesystemisusableinanoperationalsituation.TheV&VprocessSoftwareinspectionsConcernedwithanalysisof thestaticsystemrepresentationtodiscoverproblems(staticverification)Mayb

3、esupplementbytool-baseddocumentandcodeanalysisSoftwaretestingConcernedwithexercisingand observingproductbehaviour(dynamicverification)ThesystemisexecutedwithtestdataanditsoperationalbehaviourisobservedStaticanddynamicverificationStaticanddynamicV&VCanrevealthepresenceoferrorsNOTtheir absenceA

4、successfultestisatestwhichdiscoversone ormoreerrorsTheonlyvalidationtechniquefornon-functional requirementsShouldbeusedinconjunctionwithstatic verificationtoprovidefullV&VcoverageProgramtestingDefecttestingTestsdesignedtodiscoversystemdefects.Asuccessfuldefecttestisonewhichrevealsthepresenceo

5、fdefectsinasystem.Statisticaltestingtestsdesignedtoreflectthefrequenceofuserinputs.Usedforreliabilityestimation.TypesoftestingV&VgoalsVerificationandvalidationshouldestablishconfidencethatthesoftwareisfitforpurposeThisdoesNOTmeancompletelyfreeofdefectsRather,itmustbegoodenoughforitsintendedus

6、eandthetypeofusewilldeterminethedegreeofconfidencethatisneededV&VconfidenceDependsonsystem’spurpose,userexpectationsandmarketingenvironmentSoftwarefunctionThelevelofconfidencedependsonhowcriticalthesoftwareistoanorganisationUserexpectationsUsersmayhavelowexpectationsofcertainkindsofsoftwareMa

7、rketingenvironmentGettingaproducttomarketearlymaybemoreimportantthanfindingdefectsintheprogramDefecttestinganddebuggingaredistinct processesVerificationandvalidationisconcernedwithestablishingtheexistenceofdefectsinaprogramDebuggingisconcerne

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