writing_maintainable_automated_acceptance_tests.pdf

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1、WritingMaintainableAutomatedAcceptanceTestsDaleH.Emerydale@dhemery.comhttp://dhemery.comThisarticlewasoriginallypresented,underaslightlydifferentname,aspartoftheAgileTestingWorkshopatAgileDevelopmentPractices2009.I’vemadeafewminorchanges.TestAutomati

2、onisSoftwareDevelopmentTestautomationissoftwaredevelopment1.Thisprincipleimpliesthatmuchofwhatweknowaboutwritingsoftwarealsoappliestotestautomation.Andsomeofthethingsweknowmaynotbeapparenttopeoplewithlittleornoexperiencewritingsoftware.Muchofthecosto

3、fsoftwaredevelopmentismaintenance—changingthesoftwareafteritiswritten.Thissinglefactaccountsformuchofthedifferencebetweensuccessfulandunsuccessfultestautomationefforts.I’vetalkedtopeopleinmanyorganizationsthatattemptedtestautomationonlytoabandontheef

4、fortwithinafewmonths.WhenIaskwhatledthemtoabandontestautomation,themostcommonansweristhatthetestsquicklybecamebrittleandtoocostlytomaintain.Theslightestchangeintheimplementationofthesystem—forexample,renamingabutton—breaksswarmsoftests,andfixingthete

5、stsistootimeconsuming.Butsomeorganizationssucceedwithtestautomation.Don’ttheyexperiencemaintenancecosts,too?Ofcoursetheydo.Animportantdifferenceisthatwhereunsuccessfulorganizationsaresurprisedbythemaintenancecosts,successfulorganizationsexpectthem.Th

6、edifferencebetweensuccessandfailureisnotthemaintenancecostsperse,butwhethertheorganizationexpectsthem.Successfulorganizationsunderstandthattestautomationissoftwaredevelopment,thatitinvolvessignificantmaintenancecosts,andthattheycanandmustmakedelibera

7、te,vigilantefforttokeepmaintenancecostslow.Theneedtochangetestscomesfromtwodirections:changesinrequirementsandchangesinthesystem’simplementation.Eitherkindofchangecanbreakanynumberofautomatedtests.Ifthetestsbecomeoutofsyncwitheithertherequirementsort

8、heimplementation,peoplestoprunningthetestsorstoptrustingtheresults.Togetthetestsbackinsync,wemustchangetheteststoadapttothenewrequirementsorthenewimplementation.Ifwecan’tstoprequirementsandimplementationsfromchanging,theonlywaytokeepthemaintenancecos