Mocks, Stubs and Fakes. ¿What Else?

M O C K S ,
S T U B S
A N D
F 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
 alexsotob  lordofthejars

Commit Stage
C O N T I N U O U S
I N T E G R A T I O N

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 S
Pre-programmed
with
expectations

M O C K S
Pre-programmed
with
expectations
Behavior
Verification

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

T H E
G O O D
A N D
T H E
B A D
Fast
Easy
to
write

T H E
G O O D
A N D
T H E
B A D
Fast
Easy
to
write
Versatile

T H E
G O O D
A N D
T H E
B A D
Fast
Easy
to
write
Versatile
Mockito,
EasyMock,
jMock

T H E
G O O D
A N D
T H E
B A D
Fast
Easy
to
write
Versatile
Mockito,
EasyMock,
jMock
Verbose

T H E
G O O D
A N D
T H E
B A D
Fast
Easy
to
write
Versatile
Mockito,
EasyMock,
jMock
Verbose
Reimplementing
Business

T H E
G O O D
A N D
T H E
B A D
Fast
Easy
to
write
Versatile
Mockito,
EasyMock,
jMock
Verbose
Reimplementing
Business
No
state

T H E
G O O D
A N D
T H E
B A D
Fast
Easy
to
write
Versatile
Mockito,
EasyMock,
jMock
Verbose
Reimplementing
Business
No
state
No
executing
full
stack

testCompile testCompile (('org.mockito:mockito-all:1.10.19''org.mockito:mockito-all:1.10.19')) {{
exclude group exclude group:: 'org.hamcrest''org.hamcrest'
}}
D E P E N D E N C I E S

@@RunWithRunWith((MockitoJUnitRunnerMockitoJUnitRunner..classclass))
publicpublic classclass TestTest {{
@Mock EmailService email @Mock EmailService email;;
}}
@Mock EmailService email @Mock EmailService email;;

@Before @Before publicpublic voidvoid beforebefore(()) {{
MockitoAnnotations MockitoAnnotations..initMocksinitMocks((thisthis))
}}
}}
EmailService emailService EmailService emailService == Mockito Mockito..mockmock((EmailServiceEmailService..classclass));;
I N I T

MockitoMockito..whenwhen((emailemail..receiveBodyMessagesWithSubjectreceiveBodyMessagesWithSubject(("My Subject""My Subject"))))..thenReturnthenReturn(("This is My Message""This is My Message"))
SystemSystem..outout..printlnprintln((emailemail..receiveBodyMessagesWithSubjectreceiveBodyMessagesWithSubject(("Wrong subject""Wrong subject"))));;
SystemSystem..outout..printlnprintln((emailemail..receiveBodyMessagesWithSubjectreceiveBodyMessagesWithSubject(("My Subject""My Subject"))));;
SystemSystem..outout..printlnprintln((emailemail..receiveBodyMessagesWithSubjectreceiveBodyMessagesWithSubject(("My Subject""My Subject"))));;
E X A M P L E

MockitoMockito..whenwhen((emailemail..receiveBodyMessagesWithSubjectreceiveBodyMessagesWithSubject((MatchersMatchers..anyStringanyString(())))))..thenReturnthenReturn(("This is My Message""This is My Message"));;
SystemSystem..outout..printlnprintln((emailemail..receiveBodyMessagesWithSubjectreceiveBodyMessagesWithSubject(("Subject""Subject"))));;
E X A M P L E
W I T H
A N Y

InvoiceService invoiceService InvoiceService invoiceService == newnew InvoiceServiceInvoiceService((emailemail));;
invoiceServiceinvoiceService..sendsend(());;
MockitoMockito..verifyverify((emailemail,, Mockito Mockito..timestimes((11))))..sendMessagesendMessage((MatchersMatchers..anyStringanyString(()),, Matchers Matchers..anyStringanyString(())));;
E X A M P L E
V E R I F Y

InvoiceService invoiceService InvoiceService invoiceService == newnew InvoiceServiceInvoiceService((emailemail));;
ArgumentCaptor argument ArgumentCaptor argument == ArgumentCaptor ArgumentCaptor..forClassforClass((StringString..classclass));;
MockitoMockito..verifyverify((emailemail,, Mockito Mockito..timestimes((11))))..sendMessagesendMessage((argumentargument..capturecapture(()),, Matchers Matchers..anyStringanyString(())));;
AssertAssert..assertThatassertThat((argumentargument..getValuegetValue(()),, CoreMatchers CoreMatchers..startsWithstartsWith(("Invoice:""Invoice:"))));;
E X A M P L E
A R G U M E N T
C A P T O R

EmailService email EmailService email == newnew EmailServiceEmailService(());;
EmailService spyEmail EmailService spyEmail == Mockito Mockito..spyspy((emailemail));;
InvoiceService invoiceService InvoiceService invoiceService == newnew InvoiceServiceInvoiceService((spyEmailspyEmail));;
MockitoMockito..verifyverify((spyEmailspyEmail,, Mockito Mockito..timestimes((11))))..sendMessagesendMessage((argumentargument..capturecapture(()),, Matchers Matchers..anyStringanyString(())));;
E X A M P L E
S P Y

testCompile testCompile (('org.powermock:powermock-module-junit4:1.6.4''org.powermock:powermock-module-junit4:1.6.4'))
testCompile testCompile (('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))
publicpublic classclass MyTestMyTest {{
}}
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((newnew IOExceptionIOException(("error message""error message"))));;

X x X x == newnew XX(());;
xx..createMyClasscreateMyClass(());;
PowerMockitoPowerMockito..verifyNewverifyNew((MyClassMyClass..classclass))..withNoArgumentswithNoArguments(());;
M O C K
C O N S T R U C T O R

Calculator calculator Calculator calculator == PowerMockito PowerMockito..spyspy((newnew CalculatorCalculator(())));;
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

All that Glitters is not Gold
B E
A W A R E

ifif ((SystemSystem..currentTimeMilliscurrentTimeMillis(()) >> pojo pojo..getStartDategetStartDate(()) ++ expiration expiration)) {{
}}
E X A M P L E
O F
S Y S T E M

javajava..timetime..Clock clockClock clock;;
publicpublic voidvoid XX(()) {{
ifif ((eventDateeventDate..isBeforeisBefore((LocalDateLocalDate..nownow((clockclock)))) {{
}}
}}
J A V A
8

TimeResolution clockTimeResolution clock;;
publicpublic voidvoid XX(()) {{
ifif ((clockclock..nownow(()) >> pojo pojo..getStartDategetStartDate(()) ++ expiration expiration)) {{
}}
}}
J A V A

S T U B S

S T U B S
Canned
answers
to
calls

S T U B S
Canned
answers
to
calls
State
Verification

publicpublic classclass EmailServiceStubEmailServiceStub implementsimplements EmailServiceEmailService {{
privateprivate List emails List emails == newnew ArrayListArrayList<<>>(());;

publicpublic voidvoid sendMessagesendMessage((String subjectString subject,, String body String body)) {{
thisthis..emailsemails..addadd((newnew EmailEmail((subjectsubject,, body body))));;
}}

publicpublic String String receiveBodyMessagesWithSubjectreceiveBodyMessagesWithSubject((String subjectString subject)) {{
// ...// ...
}}
}}
E M A I L
S E R V I C E

T H E
G O O D
A N D
T H E
B A D
Fast
Easy
to
write
Versatile
Reimplementing
Business

T H E
G O O D
A N D
T H E
B A D
Fast
Easy
to
write
Versatile
Reimplementing
Business
Logic
is
outside
test

T H E
G O O D
A N D
T H E
B A D
Fast
Easy
to
write
Versatile
Reimplementing
Business
Logic
is
outside
test
State

@Rule@Rule
publicpublic WireMockRule wireMockRule WireMockRule wireMockRule == newnew WireMockRuleWireMockRule((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 S
Working
implementations

F A K E S
Working
implementations
With
shortcuts

T H E
G O O D
A N D
T H E
B A D
Almost
real

T H E
G O O D
A N D
T H E
B A D
Almost
real
Test
full
stack

T H E
G O O D
A N D
T H E
B A D
Almost
real
Test
full
stack
Slow

T H E
G O O D
A N D
T H E
B A D
Almost
real
Test
full
stack
Slow
Learn
New
Tech

T H E
G O O D
A N D
T H E
B A D
Almost
real
Test
full
stack
Slow
Learn
New
Tech
Different
Behaviour

M O C K I N G
2 . 0

testCompile testCompile (('org.jboss.byteman:byteman-bmunit:3.0.3''org.jboss.byteman:byteman-bmunit:3.0.3')) {{
exclude group exclude group:: 'org.testng''org.testng'
}}
B Y T E M A N

publicpublic WebWriterWebWriter((String filenameString filename)) {{
thisthis..filename filename == filename filename;;

}}
publicpublic PrintStream PrintStream openFileopenFile(()) {{
File file File file == newnew FileFile((filenamefilename));;
trytry {{
FileOutputStream fos FileOutputStream fos == newnew FileOutputStreamFileOutputStream((filefile));;
PrintStream ps PrintStream ps == newnew PrintStreamPrintStream((fosfos,, truetrue));;
returnreturn ps ps;;
}} catchcatch ((FileNotFoundExceptionFileNotFoundException e e)) {{
System System..outout..printlnprintln(("Unable to open file ""Unable to open file " ++ file file..getNamegetName(())));;
System System..outout..printlnprintln((ee));;
returnreturn nullnull;;
}}
}}
B Y T E M A N

@@RunWithRunWith((orgorg..jbossjboss..bytemanbyteman..contribcontrib..bmunitbmunit..BMUnitRunnerBMUnitRunner..classclass))
@Test @Test
@ @BMRuleBMRule((name name == "handle file not found""handle file not found",,
targetClass targetClass == "java.io.FileOutputStream""java.io.FileOutputStream",,
targetMethod targetMethod == "(File)""(File)",,
action action == "throw new FileNotFoundException( "Ha ha Byteman fooled you again!" )""throw new FileNotFoundException( "Ha ha Byteman fooled you again!" )"
))
publicpublic voidvoid handleFileNotFoundhandleFileNotFound(()) throws FileNotFoundException throws FileNotFoundException {{
System System..outout..printlnprintln(("-------- handleFileNotFound ---------""-------- handleFileNotFound ---------"));;
WebWriter writer WebWriter writer == newnew WebWriterWebWriter(("foo.html""foo.html",, "Andrew""Andrew"));;
PrintStream ps PrintStream ps == writer writer..openFileopenFile(());;
Assert Assert..assertTrueassertTrue((ps ps ==== nullnull));;
System System..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

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

stage stage 'compileAndUnit''compileAndUnit'
node node {{
git branch git branch:: 'master''master',, url url:: 'https://github.com/lordofthejars/starwars.git''https://github.com/lordofthejars/starwars.git'
gradle gradle 'clean test''clean test'
stash excludes stash excludes:: 'build/''build/',, includes includes:: '**''**',, name name:: 'source''source'
stash includes stash includes:: 'build 'build//jacocojacoco/*.exec', name: 'unitCodeCoverage'/*.exec', name: 'unitCodeCoverage'
step([$class: 'JUnitResultArchiver', testResults: '**/ step([$class: 'JUnitResultArchiver', testResults: '**/buildbuild//testtest--resultsresults//**..xml'xml']]))
}}
stage stage 'codeQuality''codeQuality'
parallel parallel 'pmd''pmd' :: {{
node node {{
unstash unstash 'source''source'
gradle gradle 'pmdMain''pmdMain'
stepstep(([[$$classclass:: 'PmdPublisher''PmdPublisher',, pattern pattern:: 'build/reports/pmd/*.xml''build/reports/pmd/*.xml']]))
}}
}},, 'jacoco''jacoco':: {{
node node {{
unstash unstash 'unitCodeCoverage''unitCodeCoverage'
gradle gradle 'jacocoTestReport''jacocoTestReport'
}}
}}
J E N K I N S F I L E
( 1 / 2 )

stage stage 'assemble-binaries''assemble-binaries'
nodenode(('linux''linux')) {{
withEnvwithEnv(([["SOURCE_BUILD_NUMBER=${env.BUILD_NUMBER}""SOURCE_BUILD_NUMBER=${env.BUILD_NUMBER}"]])) {{
gradle gradle 'assemble''assemble'
}}
}}
input messageinput message:: "Deploy Application to QA ?""Deploy Application to QA ?"
stage namestage name:: 'Deploy to QA''Deploy to QA',, concurrency concurrency:: 11
node node {{
echo echo "Application Deployed to QA.""Application Deployed to QA."
}}
J E N K I N S F I L E
( 2 / 2 )

L E T ' S
W I N D

D O W N

W H A T
Y O U
H A V E
S E E N
Unit
tests
should
be
FIRST

W H A T
Y O U
H A V E
S E E N
Unit
tests
should
be
FIRST
Mock,
Stubs
and
Fakes

W H A T
Y O U
H A V E
S E E N
Unit
tests
should
be
FIRST
Mock,
Stubs
and
Fakes
PowerMock
as
Design
Warning

W H A T
Y O U
H A V E
S E E N
Unit
tests
should
be
FIRST
Mock,
Stubs
and
Fakes
PowerMock
as
Design
Warning
Docker
as
Testing
Tool

W H A T
Y O U
H A V E
S E E N
Unit
tests
should
be
FIRST
Mock,
Stubs
and
Fakes
PowerMock
as
Design
Warning
Docker
as
Testing
Tool
Jenkins
is
not
static
anymore

Q U E S T I O N S


http://lordofthejars.github.io/mock-stub-fake/

asotobu@gmail.com

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 R W A R S
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H T T P S : / / G I T H U B . C O M / J A Y W A Y / P O W 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 / W O R K F L O W - P L U G I N

Mocks, Stubs and Fakes. ¿What Else?

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