PHPUNIT BEST PRACTICES Volker Dusch
/ @_ _edorian

ABOUT ME Software Engineer PHP
since 11 years CI CleanCode DevOps TDD Shipping Bullet points

INSTEAD OF ME

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@__edorian g+: Volker Dusch IRC: edorian Mail: php@wallbash.com

AGENDA Some practices I value
Your mileage may vary By no means complete

WRITE TESTS It's sounds obvious
but getting started sometimes is the hardest part!

THE FASTEST THING YOU CAN
DO ht=cr - saigpoetcm|ge 'oi: |w -` is`ul s tgn.rjc.o rp Lgn' c l; ts $is-q1| eh "rnpg err" et ht e | co Fotae ro! Staging server Testing your builds All without even touching PHPUnit dt=lgnts&asotscr&sf"crTkn aa"oi=etpswr=euecr=$sfoe ht=cr - PS - saigpoetcm|ge 'el,tsue'|w -` is`ul X OT d tgn.rjc.o rp Hlo etsr c l; ts $is-q1| eh "oi err" et ht e | co Lgn ro!

LET'S GO

UPGRADE TO PHPUNIT 3.7 EASE
INSTALLTION

PHAR we ht:/erppntd/e/hui.hr gt tp/pa.hui.egtppntpa
cmd+ ppntpa ho x hui.hr .ppntpa -vrin /hui.hr -eso or we ht:/erppntd/e/hui.hr gt tp/pa.hui.egtppntpa cmd+ ppntpa ho x hui.hr m ppntpa /s/oa/i/hui v hui.hr urlclbnppnt ppnt-vrin hui -eso

COMPOSER The Dependency Manager for
PHP With the best from zypper, bundler, pip, gem and npm

PHPUNIT PER PROJECT cmoe.sn opsrjo
{ "eur-e" { rqiedv: "hui/hui" ".." ppntppnt: 37* } } cmoe isal opsr ntl .vno/i/hui -vrin /edrbnppnt -eso

PHPUNIT GLOBAL INSTALL { "eur"
{ rqie: "hui/hui" ".." ppntppnt: 37* }, "ofg:{ cni" "i-i" "urlclbn" bndr: /s/oa/i/ } } sd ppcmoe isal uo h opsr ntll ppni -vrin huut -eso

PEAR pear config-set auto_discover 1
pear install pear.phpunit.de/PHPUnit phpunit --version

USE SPECIFIC ASSERTIONS PHPUnit ships
with over 90 assertions. http://www.phpunit.de/manual/current/en/appendixes.assertions.html Use them to get pretty and helpful error messages.

assertTrue vs assertInstanceOf $o =nwSdls(;
fo e tCas) $hs>setre$o isacO Cutbe; ti-asrTu(fo ntnef onal) “Failed asserting that false is true.” $o =nwSdls(; fo e tCas) $hs>setntnef'onal' $o) ti-asrIsacO(Cutbe, fo; “Failed asserting that stdClass() is an instance of interface 'Countable'.”

assertEquals vs assertJsonStringEqualsJsonFile assertEquals Fie
asrigta tosrnsaeeul ald setn ht w tig r qa. --Epce - xetd ++Ata + cul @ @ @ @ -{"ofrne:"ODM,"ak:"HUi" "SN:"paety,"huot ' Cneec" FSE" Tl" PPnt, JO" Aprnl" Sotu" :"ekn"} Jnis ' +{"ofrne:"ODM,"ak:"HUi" "SN:"paety,"huot ' Cneec" FSE" Tl" PPnt, JO" Aprnl" Sotu" :"usn } Hdo" '

assertEquals vs assertJsonStringEqualsJsonFile assertJsonStringEqualsJsonFile Fie
asrigta toojcsaeeul ald setn ht w bet r qa. --Epce - xetd ++Ata + cul @ @ @ @ sdls Ojc ( tCas bet 'ofrne = 'ODM Cneec' > FSE' 'ak = 'HUi' Tl' > PPnt 'SN = 'paety JO' > Aprnl' - 'huot = 'ekn' Sotu' > Jnis + 'huot = 'usn Sotu' > Hdo' )

HAVE A FAST TEST SUITE
If it takes to long to run your tests you won't do it

SEPERATE YOUR TESTS
http://elblinkin.info/2012/03/goldilocks-on-test-sizes/

BY FOLDER STRUCTURE . |-sc
- r | `-fo - o | `-br - a | `-Bzpp - a.h `-tss - et |-fntoa - ucinl |-itgain - nerto |-ui - nt | `-fo - o | `-br - a | `-Bzetpp - aTs.h `-wb - e ppnttssui hui et/nt

BY CONFIG FILE <etuts tssie>
<etut nm=Ui"sfi=Ts.h" tssie ae"nt ufx"etpp> <ietr>et<drcoy drcoytss/ietr> <tssie /etut> <etut nm=Itgain sfi=Ts.nerto.h" tssie ae"nerto" ufx"etItgainpp> <ietr>et<drcoy drcoytss/ietr> <tssie /etut> <tssie> /etuts ppnt-tssieUi hui -etut nt

OR HOWEVER YOU SEE FIT
Use @group Use @filter and naming conventions

BOOTSTRAP ONLY WHAT YOU NEED
You can use a test listener: http://www.phpunit.de/manual/current/en/extending- phpunit.html#extending-phpunit.PHPUnitFrameworkTestListener pbi fnto satetut(HUi_rmwr_etut $ut) ulc ucin trTsSiePPntFaeokTsSie sie { / Js a eapeo wa i psil / ut n xml f ht s osbe rqie_DR_.$ut-gtae).'otta.h' eur _I_ sie>eNm( Bosrppp; }

HOW MANY TESTS? Web: 7
Funtional: One per feature Integration: One per 3 classes Unit: Find a balance *totally made up numbers to drive home the point I'm trying to make

WEB TESTS? behat (mink) for
js-through-the-server testing - Great for testing your whole stack Really hard to maintain Mink relives some of the pain Test through your front controller instead of the webserver with behat or phpunit Faster, easier once set up

TEST CLASSES, NOT METHODS >
Unit testing, in PHP, is about testing the observable behaviors of a class! Observable from the outside! Nobody cares about the internal state of a class if it never changes the outcome of a method call.

SAMPLE What should we test
there? pbi fnto stau(vle { ulc ucin eVle$au) $hs>au =$au; ti-vle vle } pbi fnto eeue){ ulc ucin xct( i ($hs>au){ f !ti-vle trwnwEcpin"oVle n go"; ho e xeto(N au, o od) } rtr $au *1;/ bsns lgc eun vle 0 / uies oi } If we don't call setValue calling execute will throw an exception If we do call setValue calling execute will return the computed result. So we are testing two behaviors of your class and not the methods in isolation!

RELEVANT BEHAVIORS What to test
then? return values pbi fcinclisoaehi(dgesaehi){ ulc uto ecuTFrnet$ereFrnet rtr (dgesaehi -3)*5⁄9 eun $ereFrnet 2 ; } method calls to other objects pbi fcinsoCr){ ulc uto tpa( $hs>adra-egg(; ti-hnbek>nae) $hs>nie>hton) ti-egn-sudw(; } Global state pbi fcinaodhshrPsil(lgesg){ ulc uto viTiWeeosbe$oMsae fl_u_otnssai:$OFL,$oMsae FL_PED; ieptcnet(ttc:LGIE lgesg, IEAPN) $SSIN'ocls]+ _ESO[lgal'+; }

DON'T TEST GETTERS AND SETTERS
One test case per behavior You waste time Your code coverage reports won't tell you about dead code If they don't impact the outcome delete them

QUESTIONS? “The secret in testing
is in writing testable code” - Miško Hevery Additional resources "The Clean Code Talks -- Unit Testing How to Write Clean, Testable Code The Clean Code Talks - Don't Look For Things! Flaw: Brittle Global State & Singletons static considered harmful The UNIT in unit testing An introduction to PHPUnits @covers annotation

THANK YOU