Mocks, Stubs and Fakes. ¿What Else?

M O C K S , S T U B S A N DF A K E S .

¿ W H A T E L S E ?.

A L E X S O T O B - L O R D O F T H E J A R S . C O M

alexsotoblordofthejars


CommitStage

C O N T I N U O U SI N T E G R A T I O N


U N I T T E S T S

Fast,Isolated,Repeteable,Self-Validating,Timely

F I R S T

A P P L I C A T I O N S A R E C O M P L E X

T E S T D O U B L E


M O C K S


M O C K SPre-programmedwithexpectations


M O C K SPre-programmedwithexpectations

BehaviorVerification


T H E G O O D A N D T H E B A DFast



Easytowrite



EasytowriteVersatile




Mockito,EasyMock,jMock




Mockito,EasyMock,jMockVerbose





ReimplementingBusiness





ReimplementingBusinessNostate





ReimplementingBusinessNostate

Noexecutingfullstack


testCompiletestCompile(('org.mockito:mockito-all:1.10.19''org.mockito:mockito-all:1.10.19')){{

excludegroupexcludegroup::'org.hamcrest''org.hamcrest'

}}

D E P E N D E N C I E S


@@RunWithRunWith((MockitoJUnitRunnerMockitoJUnitRunner..classclass))

publicpublicclassclassTestTest{{

@MockEmailServiceemail@MockEmailServiceemail;;

}}


@MockEmailServiceemail@MockEmailServiceemail;;

@Before@Beforepublicpublicvoidvoidbeforebefore(()){{

MockitoAnnotationsMockitoAnnotations..initMocksinitMocks((thisthis))

}}

}}

EmailServiceemailServiceEmailServiceemailService==MockitoMockito..mockmock((EmailServiceEmailService..classclass));;

I N I T


MockitoMockito..whenwhen((emailemail..receiveBodyMessagesWithSubjectreceiveBodyMessagesWithSubject(("MySubject""MySubject"))))..thenReturnthenReturn(("ThisisMyMessage""ThisisMyMessage"))

SystemSystem..outout..printlnprintln((emailemail..receiveBodyMessagesWithSubjectreceiveBodyMessagesWithSubject(("Wrongsubject""Wrongsubject"))));;

SystemSystem..outout..printlnprintln((emailemail..receiveBodyMessagesWithSubjectreceiveBodyMessagesWithSubject(("MySubject""MySubject"))));;

SystemSystem..outout..printlnprintln((emailemail..receiveBodyMessagesWithSubjectreceiveBodyMessagesWithSubject(("MySubject""MySubject"))));;

E X A M P L E


MockitoMockito..whenwhen((emailemail..receiveBodyMessagesWithSubjectreceiveBodyMessagesWithSubject((MatchersMatchers..anyStringanyString(())))))..thenReturnthenReturn(("ThisisMyMessage""ThisisMyMessage"));;

SystemSystem..outout..printlnprintln((emailemail..receiveBodyMessagesWithSubjectreceiveBodyMessagesWithSubject(("Subject""Subject"))));;

E X A M P L E W I T H A N Y


InvoiceServiceinvoiceServiceInvoiceServiceinvoiceService==newnewInvoiceServiceInvoiceService((emailemail));;

invoiceServiceinvoiceService..sendsend(());;

MockitoMockito..verifyverify((emailemail,,MockitoMockito..timestimes((11))))..sendMessagesendMessage((MatchersMatchers..anyStringanyString(()),,MatchersMatchers..anyStringanyString(())));;

E X A M P L E V E R I F Y


InvoiceServiceinvoiceServiceInvoiceServiceinvoiceService==newnewInvoiceServiceInvoiceService((emailemail));;


ArgumentCaptorargumentArgumentCaptorargument==ArgumentCaptorArgumentCaptor..forClassforClass((StringString..classclass));;

MockitoMockito..verifyverify((emailemail,,MockitoMockito..timestimes((11))))..sendMessagesendMessage((argumentargument..capturecapture(()),,MatchersMatchers..anyStringanyString(())));;

AssertAssert..assertThatassertThat((argumentargument..getValuegetValue(()),,CoreMatchersCoreMatchers..startsWithstartsWith(("Invoice:""Invoice:"))));;

E X A M P L E A R G U M E N T C A P T O R


EmailServiceemailEmailServiceemail==newnewEmailServiceEmailService(());;

EmailServicespyEmailEmailServicespyEmail==MockitoMockito..spyspy((emailemail));;

InvoiceServiceinvoiceServiceInvoiceServiceinvoiceService==newnewInvoiceServiceInvoiceService((spyEmailspyEmail));;


MockitoMockito..verifyverify((spyEmailspyEmail,,MockitoMockito..timestimes((11))))..sendMessagesendMessage((argumentargument..capturecapture(()),,MatchersMatchers..anyStringanyString(())));;

E X A M P L E S P Y


testCompiletestCompile(('org.powermock:powermock-module-junit4:1.6.4''org.powermock:powermock-module-junit4:1.6.4'))

testCompiletestCompile(('org.powermock:powermock-api-mockito:1.6.4''org.powermock:powermock-api-mockito:1.6.4'))

D E P E N D E N C I E S


@@RunWithRunWith((PowerMockRunnerPowerMockRunner..classclass))

@@PrepareForTestPrepareForTest((StaticClassStaticClass..classclass))

publicpublicclassclassMyTestMyTest{{

}}

P R E P A R E F O R M O C K I N G


PowerMockitoPowerMockito..mockStaticmockStatic((StaticClassStaticClass..classclass));;

MockitoMockito..whenwhen((StaticClassStaticClass..getValuegetValue(())))..thenReturnthenReturn(("Hello""Hello"));;

SystemSystem..outout..printlnprintln((StaticClassStaticClass..getValuegetValue(())));;

PowerMockitoPowerMockito..verifyStaticverifyStatic(());;

M O C K S T A T I C


PowerMockitoPowerMockito..whenNewwhenNew((MyClassMyClass..classclass))

..withNoArgumentswithNoArguments(())

..thenThrowthenThrow((newnewIOExceptionIOException(("errormessage""errormessage"))));;

XxXx==newnewXX(());;

xx..createMyClasscreateMyClass(());;

PowerMockitoPowerMockito..verifyNewverifyNew((MyClassMyClass..classclass))..withNoArgumentswithNoArguments(());;

M O C K C O N S T R U C T O R


CalculatorcalculatorCalculatorcalculator==PowerMockitoPowerMockito..spyspy((newnewCalculatorCalculator(())));;

PowerMockitoPowerMockito..doReturndoReturn((truetrue))..whenwhen((calculatorcalculator,,"isCalculated""isCalculated"));;

SystemSystem..outout..printlnprintln((calculatorcalculator..calculatecalculate(())));;

PowerMockitoPowerMockito..verifyPrivateverifyPrivate((calculatorcalculator))..invokeinvoke(("isCalculated""isCalculated"));;

P R I V A T E M E T H O D


AllthatGlittersisnotGold

B E A W A R E


ifif((SystemSystem..currentTimeMilliscurrentTimeMillis(())>>pojopojo..getStartDategetStartDate(())++expirationexpiration)){{

}}

E X A M P L E O F S Y S T E M


javajava..timetime..ClockclockClockclock;;

publicpublicvoidvoidXX(()){{

ifif((eventDateeventDate..isBeforeisBefore((LocalDateLocalDate..nownow((clockclock)))){{

}}

}}

J A V A 8


TimeResolutionclockTimeResolutionclock;;

publicpublicvoidvoidXX(()){{

ifif((clockclock..nownow(())>>pojopojo..getStartDategetStartDate(())++expirationexpiration)){{

}}

}}

J A V A


S T U B S


S T U B SCannedanswerstocalls


S T U B SCannedanswerstocalls

StateVerification


publicpublicclassclassEmailServiceStubEmailServiceStubimplementsimplementsEmailServiceEmailService{{

privateprivateListemailsListemails==newnewArrayListArrayList<<>>(());;

publicpublicvoidvoidsendMessagesendMessage((StringsubjectStringsubject,,StringbodyStringbody)){{

thisthis..emailsemails..addadd((newnewEmailEmail((subjectsubject,,bodybody))));;

}}

publicpublicStringStringreceiveBodyMessagesWithSubjectreceiveBodyMessagesWithSubject((StringsubjectStringsubject)){{

//...//...

}}

}}

E M A I L S E R V I C E





Easytowrite







ReimplementingBusiness




ReimplementingBusinessLogicisoutsidetest




ReimplementingBusinessLogicisoutsidetest

State



@Rule@Rule

publicpublicWireMockRulewireMockRuleWireMockRulewireMockRule==newnewWireMockRuleWireMockRule((80898089));;

stubForstubFor((getget((urlEqualTourlEqualTo(("/planets/""/planets/"))))

..willReturnwillReturn((aResponseaResponse(())

..withHeaderwithHeader(("Content-Type""Content-Type",,"application/json""application/json"))

..withBodywithBody((FilesFiles..readAllBytesreadAllBytes((configFileconfigFile..toPathtoPath(())))))))

));;

clientclient..targettarget(("http://localhost:8089/""http://localhost:8089/"))..pathpath(("planets/""planets/"));;

W I R E M O C K


F A K E S


F A K E SWorkingimplementations


F A K E SWorkingimplementations

Withshortcuts





T H E G O O D A N D T H E B A DAlmostreal


T H E G O O D A N D T H E B A DAlmostrealTestfullstack



Slow



SlowLearnNewTech



SlowLearnNewTech

DifferentBehaviour


M O C K I N G 2 . 0



testCompiletestCompile(('org.jboss.byteman:byteman-bmunit:3.0.3''org.jboss.byteman:byteman-bmunit:3.0.3')){{

excludegroupexcludegroup::'org.testng''org.testng'

}}

B Y T E M A N


publicpublicWebWriterWebWriter((StringfilenameStringfilename)){{

thisthis..filenamefilename==filenamefilename;;

}}

publicpublicPrintStreamPrintStreamopenFileopenFile(()){{

FilefileFilefile==newnewFileFile((filenamefilename));;

trytry{{

FileOutputStreamfosFileOutputStreamfos==newnewFileOutputStreamFileOutputStream((filefile));;

PrintStreampsPrintStreamps==newnewPrintStreamPrintStream((fosfos,,truetrue));;

returnreturnpsps;;

}}catchcatch((FileNotFoundExceptionFileNotFoundExceptionee)){{

SystemSystem..outout..printlnprintln(("Unabletoopenfile""Unabletoopenfile"++filefile..getNamegetName(())));;

SystemSystem..outout..printlnprintln((ee));;

returnreturnnullnull;;

}}

}}

B Y T E M A N


@@RunWithRunWith((orgorg..jbossjboss..bytemanbyteman..contribcontrib..bmunitbmunit..BMUnitRunnerBMUnitRunner..classclass))


@Test@Test

@@BMRuleBMRule((namename=="handlefilenotfound""handlefilenotfound",,

targetClasstargetClass=="java.io.FileOutputStream""java.io.FileOutputStream",,

targetMethodtargetMethod=="(File)""(File)",,

actionaction=="thrownewFileNotFoundException(\"HahaBytemanfooledyouagain!\")""thrownewFileNotFoundException(\"HahaBytemanfooledyouagain!\")"

))

publicpublicvoidvoidhandleFileNotFoundhandleFileNotFound(())throwsFileNotFoundExceptionthrowsFileNotFoundException{{

SystemSystem..outout..printlnprintln(("--------handleFileNotFound---------""--------handleFileNotFound---------"));;

WebWriterwriterWebWriterwriter==newnewWebWriterWebWriter(("foo.html""foo.html",,"Andrew""Andrew"));;

PrintStreampsPrintStreamps==writerwriter..openFileopenFile(());;

AssertAssert..assertTrueassertTrue((psps====nullnull));;

SystemSystem..outout..printlnprintln(("--------handleFileNotFound---------\n""--------handleFileNotFound---------\n"));;

}}

}}

B Y T E M A N


D O C K E R A S T E S T I N G T O O L



PipelinePlugin

C O N T I N U O U SI N T E G R A T I O N A S C O D E



stagestage'compileAndUnit''compileAndUnit'

nodenode{{

gitbranchgitbranch::'master''master',,urlurl::'https://github.com/lordofthejars/starwars.git''https://github.com/lordofthejars/starwars.git'

gradlegradle'cleantest''cleantest'

stashexcludesstashexcludes::'build/''build/',,includesincludes::'**''**',,namename::'source''source'

stashincludesstashincludes::'build'build//jacocojacoco/*.exec',name:'unitCodeCoverage'/*.exec',name:'unitCodeCoverage'

step([$class:'JUnitResultArchiver',testResults:'**/step([$class:'JUnitResultArchiver',testResults:'**/buildbuild//testtest--resultsresults//**..xml'xml']]))

}}

stagestage'codeQuality''codeQuality'

parallelparallel'pmd''pmd'::{{

nodenode{{

unstashunstash'source''source'

gradlegradle'pmdMain''pmdMain'

stepstep(([[$$classclass::'PmdPublisher''PmdPublisher',,patternpattern::'build/reports/pmd/*.xml''build/reports/pmd/*.xml']]))

}}

}},,'jacoco''jacoco'::{{

nodenode{{


unstashunstash'unitCodeCoverage''unitCodeCoverage'

gradlegradle'jacocoTestReport''jacocoTestReport'

}}

}}

J E N K I N S F I L E ( 1 / 2 )


stagestage'assemble-binaries''assemble-binaries'

nodenode(('linux''linux')){{


withEnvwithEnv(([["SOURCE_BUILD_NUMBER=${env.BUILD_NUMBER}""SOURCE_BUILD_NUMBER=${env.BUILD_NUMBER}"]])){{

gradlegradle'assemble''assemble'

}}

}}

inputmessageinputmessage::"DeployApplicationtoQA?""DeployApplicationtoQA?"

stagenamestagename::'DeploytoQA''DeploytoQA',,concurrencyconcurrency::11

nodenode{{

echoecho"ApplicationDeployedtoQA.""ApplicationDeployedtoQA."

}}

J E N K I N S F I L E ( 2 / 2 )



L E T ' S W I N D D OW N


W H A T Y O U H A V E S E E NUnittestsshouldbeFIRST


W H A T Y O U H A V E S E E NUnittestsshouldbeFIRSTMock,StubsandFakes



PowerMockasDesignWarning



PowerMockasDesignWarningDockerasTestingTool



PowerMockasDesignWarningDockerasTestingTool

Jenkinsisnotstaticanymore



Q U E S T I O N S


http://lordofthejars.github.io/mock-stub-fake/

[email protected]


http://lordofthejars.github.io/mock-stub-fake/

H T T P S : / / G I T H U B . C O M / L O R D O F T H E J A R S / S T A RWA R S

H T T P : / / S I T E . M O C K I T O . O R G /

H T T P S : / / G I T H U B . C O M / J A Y WA Y / P OW E R M O C K

H T T P : / / W I R E M O C K . O R G /

H T T P : / / A R Q U I L L I A N . O R G /

H T T P : / / B Y T E M A N . J B O S S . O R G /

H T T P S : / / G I T H U B . C O M / J E N K I N S C I / WO R K F L OW - P L U G I N

http://localhost:8080/github.com/lordofthejars/starwars

http://site.mockito.org/

https://github.com/jayway/powermock

http://wiremock.org/

http://arquillian.org/

http://byteman.jboss.org/

https://github.com/jenkinsci/workflow-plugin

Software

Mocks, Stubs and Fakes. ¿What Else?