TechTalk: Going Full Circle - Linking Code to Tests to Requirements and Back Around Again
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Transcript of TechTalk: Going Full Circle - Linking Code to Tests to Requirements and Back Around Again
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World®’16
TechTalk:GoingFullCircle- LinkingCodetoTeststoRequirementsandBackAroundAgainJamesWalker– PrincipalSoftwareEngineer– CATechnologies
DO5T05
DEVOPS
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©2016CA.Allrightsreserved.Alltrademarksreferencedhereinbelongtotheirrespectivecompanies.
Thecontentprovidedinthis CAWorld2016presentationisintendedforinformationalpurposesonlyanddoesnotformanytypeofwarranty. The informationprovidedbyaCApartnerand/orCAcustomerhasnotbeenreviewedforaccuracybyCA.
ForInformationalPurposesOnlyTermsofthisPresentation
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Abstract
Dependencymappinglinksrequirements,codeandtests,andiscentraltogooddevelopmentpractice.
Thissessionwillshow:
§ HowCAAgileRequirementsDesignercanbeusedtocreateathreewaybindbetweentherequirements,codeandtests.
§ Howformalmodeling canbeusedtocreateafulldependencymapofeventhemostcomplexsystems,whileintroducingtraceabilitybetweenthedesign,codeandtests.
Withfulldependencymapping,whenachangeismadetoagivencomponentintherequirements,itsimpactacrosstheentiresystemcanbeidentified,informingthedevelopersofexactlywhatneedschangingandwhere.Testscanbeautomaticallygeneratedfromtheformalmodel,andcanbeupdatedautomaticallytovalidatethatthischangehasbeensuccessfullyimplementedinthecode.
Whenanotherchangeismade,rounditgoesagain…
James
WalkerCATechnologiesPrincipalSoftwareEngineer
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SOFTWAREDEVELOPMENTCHALLENGES
MODELBASEDTESTING(MBT)
FEEDBACKDRIVENTESTING
CONCLUSION
1
2
3
4
Agenda
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AboutMe– JamesWalker
§ BSc,MRes,PhD– SwanseaUniversity,Wales
§ ResearchinDataVisualisation/BigDataproblems
§ Grid-Tools– SoftwareEngineer(2012– 2015)
§ CATechnologies– LeadEngineeronCAARD(2015)
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Maybeyouwon’tquitegettoenjoyyourweekendyet!
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TypicalProject
Requirements
Design
Development
QA
Release
Analyst&Customer
Architect
Developer
Tester
Release
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Waterfall
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Problematic...§ Inflexible(linear)
§ Fewbusinesssystemshavestablerequirements
§ Longreleasecycle– Expensive– Faillate
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WaterfallProjectRequirements
Design
Development
QA
Release
Analyst&Customer
Architect
Developer
Tester
Release
Months/Years
WinstonRoyce– demonstratedthewaterfallasacriticismforhownotto
developsoftware!
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ContinuousDelivery
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ContinuousDeliveryProjectRequirements
Design
Development
QA
Release(MVP)
Months/Years
Requirements
Design
Development
QA
Release(MVP)
Requirements
Design
Development
QA
Release(MVP)
Weeks
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InTheoryThisisGreat…§ Eachtimewetestthedeliverable
§ Highlyadaptivetochange
§ Deliverfaster
§ Earlierfeedback(failfast)
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InReality…Heroculture— Fullthrottletosavetheproject
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TheProblem:Alackofclarityandvisionduringeachiteration
BusinessAnalyst Programmer TesterUser
TheUserKnowswhattheywantTheAnalystspecifieswhatthatis
TheProgrammerwritesthecode
TheTesterteststheprogram
Thefurtherthevisionsdiverge
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Traditionaltestingmethodsaretooslow,manual,andlinear forContinuesdelivery,compromisingspeedandquality
0% 10% 20% 30% 40% 50% 60% 70%
Time/resourcesintestdatacompliance(PII)
Defectsstemmingfromambiguousrequirements
Testinginnefficienciesleadingtohighercost
Lackoftestcoveragecreatingdefects/rework
Difficultyfindingtherightdataforaparticulartest
Manualtestingleadingtoprojectdelays
What'sthebiggestproblemyouface?
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1– PoorRequirements
§ Aplethoraoftechniquesexist,mostarewritteninambiguousnaturallanguage
§ Therequirementsare“static”- theyoffernowaytoderivetestsdirectlyfromthem…
§ …nowaytoupdatetestswhentherequirementschange– thishastobedonemanually
Bottlenecks
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2– ManualTestCaseDesign§ Currentlymanual– atimeconsuming,error-prone process
§ Isunsystematic,adhoc,andhasnorealnotionof“coverage”
§ Over-testing andunder-testing – 10-20%coveragewith4timesover-testing
§ Poorrequirementsleadtopooroveralltesting,withtestershavingtofillinthegaps
§ Nolinkagetotestdata – processismanual,painstakingandverytime-consuming
§ Noflexibilityforchangerequests:acriticalweaknessinanagileorcontinuousdeliveryenvironment.Changestakelongerthantheoriginalrequirement.
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3– PoorTesting->AutomatedtestingAutomatedtesting:Manualscriptgeneration
§ Automatedtestingframeworksareheavilyscripted
§ Scriptgenerationisusuallydonemanually
§ Aswellasthemaintenanceofscripts
§ Alternativesolutionsuse:
§ Recordplayback
§ Script-lessautomationframeworks(keyword)
Butyou’restilldoingmanualtestcasedesign!
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TheVisionClarityandVisionDuringDevelopment
BusinessAnalyst Programmer TesterUser
Therearelessbugsandtheproductisdeliveredfaster
Thecloserthevisionmeanstheusergetsaqualityproduct
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ModelBasedTesting
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Modelbasedtestinglet’syoudefinethebehaviorofasystemundertest– inotherwordswhatissupposedtohappen.
WhatisModelBasedTesting?
Model
System
Themodelisthenusedtotesttheactualsystemtoseeifitdoeswhatitismeantto.
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ModelRequirementsasan“Active”Flowchart
§ AformalmodelthatisaccessibletothebusinesswhoalreadyuseVISIO,BPM,etc.
§ Whichisalsoamathematicallyprecisemodelofasystem,sothatiteliminatesambiguityandincompleteness
§ Itcanbeusedbytestersanddevelopers– itbringstheend-user,businessandITintoclosealignment
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NewDeliveryParadigm:FromIdeationtoDesign,DevelopmentandTesting
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TestingWiththe“Active”Flowchart
§ Testerscanoverlaytheflowchartwithallthefunctionallogicanddatainvolvedinasystem
§ Testscanthereforebeautomaticallyderivedfromit
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§ Exhaustivelytestamodel– extractallpossibleroutesfromstart->end
§ Eachroute/pathbecomesatestcase
§ Numberofroutesgrowsexponentiallywitheveryaddeddecision
32nodes+62edges=1,073,741,824 possibleroutes
GeneratingTestCases
2145Paths
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§ Coverage,inmostcases,isrelatedtohowmuchfunctionalityisbeingcoveredinatestcase.
§ Traversethemodelbysatisfyingcoverageconstraints:
Optimization/Coverage
19PathsEdgePairs
9PathsInOutEdges
5PathsEdges
3PathsNodes
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OverlayingAutomation
§ Testautomaters overlaycodesnippetsontoprocesseswhichcorrespondtothecodewhichperformseachaction
§ Automationscriptscanthereforebeautomaticallyderivedfromit
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ProvideFullTraceabilityWithRequirements
§ Knowwhatneedstobere-testedandwhentheintegrityofasystemisatrisk…“IfIchangethis,whatwillIbreak?”
§ Theimpactofachangemadetoanindividualcomponentisidentifiedsystemwide
§ Theimpactontestcasesanduserstoriesupanddownasystemcanalsobeidentifiedautomatically
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DEMO
Visitourboothformore!
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FeedbackLoops– TheFuture
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TypicalBuildProcess
ExecutionEngine
BuildEngineDevelopment/
Code
DifferentvisualrepresentationsofPass/Failresults.
TrafficLights Dashboarding Email(Jenkins)
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Scenario
Testing– Grayarea
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NeedleinaHaystackWithouttheRightInfrastructure
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TestingBermudaTriangle
Code
RequirementsTestCases
Thefurtherapartthesearethelessquality
• Modelrepresentstherequirements• Codeisimplementedusingthemodel(canaddlinkstospecificobjects/methods).
• Testcasesaregeneratedfromthemodel
Usingtheseweobtainaclosebindingbetweenallthree.
Fulltraceabilityenablessolvingthepreviousproblemsefficiently
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TheFutureisFeedbackLoops(NewWorldOrder)
ExecutionEngine
BuildEngine
Development/Code
Model
Runresults
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ScenarioRevisit– Whatdoesthepass/failrepresent?Testresultsbounddirectlytotheirroutesthrough
thesystem.
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ScenarioRevisit– ExploratorytestingAfterafailurethemodelcanbeusedtogeneratememoretest
casesbypinpointtesting– testcasesfocusedondiscoveringmoreknowledgeaboutthefailure.
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ScenarioRevisit– RiskAnalysisUsemeta-deta assignedtothemodeltoperformriskanalysis.Aretheeffectedroutesthroughthesystemaboveasetthreshold?
=63%ofUserActivity
Can’tRelease
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ScenarioRevisit– GettingitFixed!We’vefoundtheprocess(es)responsible– nowwecantraceback
totheresponsibleteams!
DevelopmentPinpointedFailure
Defectcreated
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Conclusion
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WhydoIneedthecode,requirements,andtestsstronglybound?§ AshiftingITlandscapehastransformedtheroleoftesters–
testingisnowcross-functionalanditerative,withanemphasisonfeedbackthroughout
§ Newtestanddevelopmentemerged,butthe“heroculture”remained…
§ …Alongwiththechallengesofslow,manualtesting,ambiguousrequirementsand“toolshops”
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TheVision:ShiftLeft,ShiftRight– OverlappingFeedbackLoops
§ ShiftLeft:workiterativelywithuserstogainupfrontknowledgeoftherequirementsandusethesetodriveactivitythroughoutthedevelopmentcycle
§ ShiftRight:connect-uptoolstacks anduse(test)analyticstoharnesstheinsightsoftesting,productionandoperations
§ Feedtheseinsightsbackintothemodel,andthewholeprocessgoesbackroundagainsoyoucanenjoyyourweekend
WhydoIneedthecode,requirements,andtestsstronglybound?
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RecommendedSessions
SESSION# TITLE DATE/TIME
DO5X27S What’sNewinCAAgileRequirementsDesigner 11/17/2016at12:45pm
DO5X29SModel-BasedTestingforAchievingMaximumCDPipelineAcceleration 11/17/2016at3:00pm
DO5X40S CaseStudy:WhyRabobankWasInspired 11/17/2016at3:45pm
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Stayconnectedatcommunities.ca.com
Thankyou.
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DevOps– ContinuousDelivery
FormoreinformationonDevOps– ContinuousDelivery,pleasevisit:http://cainc.to/PiTFpu