软件测试 Software Tes

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1、SoftwareTestingChapter1SoftwareTestingIntroductionContents1.1WhySoftwareTestingisNeeded1.2BasicConceptsofSoftwareTesting1.3ReasonofSoftwareDefect1.4RelationshipbetweenSoftwareDevelopmentandTesting1.5SoftwareTestingRules1.6CapabilityforSoftwareTester1.1WhySoftwareTestingisNeeded1.1WhySoft

2、wareTestingisNeeded1.1WhySoftwareTestingisNeededInfamoussoftwareerrorcasestudiesWorldWarIII…Almost(1983)PatriotMissileBug(1991)Killing28soldiersandinjuringaround100otherpeopleMultidataSystems(2000)Atleast8patientsdie,whileanother20receiveoverdoses1.1WhySoftwareTestingisNeededQualifiedrat

3、eofproductsQualifiedrateofairplanemanufacturingindustry“Aerobus747-400”aremadeupof1000,000partsQualifiedrateofeverypart:99.9999%Doyouknowthequalifiedrate？（99.9999%）1000000=36.79%1.1WhySoftwareTestingisNeededQualifiedrateofproductsQualifiedrateofsoftwareCodingline:99%Write10,000linescodeD

4、oyouknowthequalifiedrate?（99%）10000=2.25×10-441.2BasicConceptsofSoftwareTestingConceptsrelatedtosoftwaretestingError（错误）:occursintheprocessofwritingaprogram.Fault（故障）:isthemanifestation（表现）ofoneormoreerrors.Failure（失效）:occurswhenfaultypieceofcodeisexecutedleadingtoanincorrectstatethatpro

5、pagates（传播）totheprogram’soutput.Incident（事故）:nomessageisdisplayedwhenfailureoccurs.Defect1.2BasicConceptsofSoftwareTestingSoftwaredefect（缺陷）definitionOutofaccordwithuserexpectancy（期望）SoftwarefunctioncanbeexecutedincorrectlyDefectofSoftware=BugAllkindsofsoftwareproblemsInconsistency,useri

6、nterfacefault1.2BasicConceptsofSoftwareTestingDefectexample：Shortcoming:runningslowly.Inconsistency:Ctrl+Scan’tsaveallapplications.Userinterfacedesigndefect:anbuttonshouldshow5wordsonit,butonly3wordscouldbeseen.1.2BasicConceptsofSoftwareTestingConceptsrelatedtosoftwaretestingCorrectprogr

7、amNosyntaxerrorNoobviouserrorsduringrunningNoimproperstatementsValidinput-correctoutputInvalidinput-correctoutputAnypossibleinput-correctoutput1.2BasicConceptsofSoftwareTestingConceptsrelatedtosoftwaretestingTest&debugAutomatedtestvs.manualoperateDon’tknowdetailsareOKvs.m