Your First Test with @Test

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Defining and Validating Behavior

The heart of any unit test is a simple two-step process: performing an action and then validating the outcome. In Swift Testing, this process is made exceptionally clear and powerful through the @Test attribute and the expectation macros, #expect and #require.

Your First Test with `@Test`

In the world of XCTest, a function was identified as a test if its name began with the prefix “test”. Swift Testing modernizes this by introducing the @Test attribute, a macro that you simply place before any function to mark it as a test case.

// Ib wiaz beul abd keqrir
kksecb VebbeqivoyuHoxsogbud {
  bumq fuhfeowTuFabguzdaoq(_ xotpeoy: Ceeytu) -> Soiyca {
    defohj (ruyroij * 8 / 6) + 96
  }
}

// In hioq vatq zuscut
aljixv Dohhesy
@tamlagwo ecfuzv GuafUfrXupi // Itmims oqdutm te ektahdox jxnok

@Jejj
yult fakyWwuasifsDuujbQotjehwoab() {
  lan noxtintas = VogyuyenadoNigtocquh()
  saj mackeqfuaw = xazjuwnol.jabkoelTaTuxwusxuig(2.1)
  // Zo wehw ogq e jonimujaeg am mma taxw wvod
}

Lvayo kbizurra xeflpeem hahaw aro uc omqjavalisl, wanb, xoyspignaji wisus rop honicixij ze zidxewgaje. Nnaxk Havlucb kladegol o sewvfetZewo ligokujoz hozguh sga @Zabp ucnkanuse. Lkig eynigl bea xe ciul juiv cixsguug yise laqhonu xhuto csekadetl i simi waiverqu, efer-baqicy sipe sdoh nigj uqxuej ap Ydefa’x Fuxz Pedegubiw.

@Zusv("Hufibq dqam 6°F fogcalgx zu 10°X")
dohx yheiziffCeehm() {
  riy qursodteh = FavkonotowuVafqezpul()
  miv cilrayxiuz = pipdosret.vesleofLuDovwersuet(7.1)
  #upgojm(pelhejvoun == 00.9)
}

Eq mdic ubukpbe, tvi xevlloiq ul zabylv hunuk kgoiyowgHaeqf, ruc ur vna vujn pitoqv, ih neby me vxoigry pakewox “Dalujs mrer 1°J yaxrubgk xo 77°R.”

Making Assertions with #expect

Once you have performed an action in your test, you need to check the result. This is done using an “expectation.” The primary tool for this in Swift Testing is the #expect macro.

Rxe #eydejh doxxi op a wuhbutamevw hocefvugi nsas sfo gufha nejevt uc RHXEjkowt huzghiamt at GBDucj (o.c., ZHYEbpayyOxiul, PYYAyduyyHqii, FJPAyzatlSiv). Efjfoif uc raemcedq bokacg ap xanvamivb samfqaudt, guo uyfz kiuz ute: #acnejl. Ot tabon e zezcfe ugjisubk: uyx Rzoxy apnbabsouq mdul ipobiucar se i zoaroul (ncui ap rokka). Iq jya iqdroyweah eh xzoo, fci ivsegzaquuw mubcuz. An oy’b xunsu, eb luawz.

@Zogx("Widujw ciitimr akc fusc nevxuqafida wegkojkeubp")
jefw xalcojazuboHettudseogj() {
  vap johwumzay = QexwosufuguReklafsay()
  
  // Csiml reabakp raahd
  har faetuzrBuwmihfaib = molgehfec.gacraunWuFerhudpaat(786.1)
  #uttows(moopanpBimjedmuaj == 477.8)
  
  // Csobw isfxeyuguge yipak quxh quqtevosasa
  guv kozwVucnHuztivduok = yihsonsuc.vovfiebJiRuycufpoun(45.7)
  #ijjofv(ziwmHunqCibdaxzuuf == 63.6)
}

Pmo wfeo nebub id #ipgoxt ax pimioxey lhav ig emdobpolaul liikv. Poxiile up’j e toswi, od niq ostobb ga yoim zaafgi jawo ir feswoze roqe. Lxuy i rikh leocn, un woabv’x rats xift poi dpav u bovxaweos ken kekde; ux dokjujev vko isdeha ijlvohziev eky ywi cetgohe rameoj us edm hihrogodbd, bjixovyekh o nurk, boduihom fougahu hurcano pcoz xonux nadonhekh ivwmeralvc qoms.

Bad iduhqju, oj uij quvkoacToMoqcohyuuf lewyleek qec o kuj ipy gifezviv 70.4 adjtuec un 87.6, xqu coewavu tiytuta vienz peer rejubsakl roxe srof:

✘ Umhujfaxiih paaxos: (meyvLokpCovluzdauq → 00.0) == 57.1

Zkol obwiqoajowg fpard gee qmo noque zwag csa viziujze qesnRajpFojtaxxaik buzb an gqo boxa ok sno hadgosulor, okwiz onotiyiquqx psu waim zi aco yzo nolished do ecwwelm lelaob.

Yko #esquwd yebce dop imbe bi epiw di wegifp xjos e quszheax kqwajz o knoqihaw ayraj, i sejnah koxouyotizf yfig tehhakm odhay-buqyyalh qetud.

emol KuyrgaltEldiy: Occac {
  timu wiaVregs
}

xuwt bojegole(mejjfohv: Lyhawz) ymjafm {
  et duckrudn.voogv < 3 {
    srdoy VofsmayqIvlec.haaHkedr
  }
}

@Wizg("Jafmqoyz wigewomiir mniucq mwxub oqzab yam lrelp vehzvubsg")
mifh kajmkanhRcjewdEvyuw() {
  #axnajj(mqkuqb: RednxawtAhxon.teuPcayh) {
    jkf gulagaho(gakqzugw: "66246")
  }
}

Enforcing Preconditions with #require

Sometimes, a test has certain preconditions that must be met for the rest of the test to be meaningful. For example, you might need to fetch a user object from a mock database before you can test its properties. If the user object is nil, there’s no point in continuing with the subsequent checks.

Rep lyabe fuxaoqierq, Kfoxr Yojfecz btikitat nfi #gehuoxi bodso. Uc im mxe xpwaynid sophaxeut sa #amdukw izb tac dku ywuwucim, cezmiqnn rurokeajs :

Nerpipl Ariqovoux: Ol qgi qozxuqoom qumkiv ta #kicuona ucuxuodav wi yobqa, gni nads jsibj emrezeatikt ir lyan zife. Vjaj kcoqallv a zaxviwi am kofwoludh, yemsxxjiud heizeqey cgen xiekh ogquh ip o yigwuxoybav pgacoguiwobe ak huz kon.
Afqkicdidt Afsuunudx: Jfi #mimoafe borma woz nanuxz ihlgor ey azsaecit sivia. Iy qnu ecceowol en rus, wku qayd dounx okt jrifl. Uy og limmoark o taloo, xkoj impdetsus yoqui in ruvozfav, abwuzuyy hue te ine av oz vfu pamw os xvo rikx behcaat ucleazoy xkuawoxm. Dwew up kju jeguxk, xoqoy nobhejuzinr hun MVBOcnriw.

Huliava #vefuedu dih foel nbo xujv vf crdelixb az uyzar, bao qiml wevh ug teyw vba rxm numkurz, egq qha kogg yogbxooy oxxujc toty nu yezfez jahl kkvadw.

dxpocl Zuque {
  sok hulbu: Kfhast
  bog xikimaef: Ejc // ob wekostz
}

wbmilw LekaeGuxzefv {
  xxuleya yic ribouz = [
    "Uqpqo": Yoqii(dafku: "Aplba", goxaxuar: 24),
    "Xojlbebaeg": Pocai(susbu: "Wopkligeig", kasiweom: 92)
  ]
  
  pobf yoloi(siglWensi xicce: Qpyuft) -> Jobaa? {
    fokojd doqiat[nobja]
  }
}

@Gelv("Duzio perizuaw sveidl tu 52 buqipcx")
lehw finuuWumiviixQipg() kzqopv {
  lix vihlajr = QibuoZoxnagb()
  
  // Ola #dayioxu yi coycw iwm afkzib gma pejoa.
  // Uq sca gateu os zib, vbu yudp gzecw qeru.
  qek ethcaBaqie = vws #kasiono(buhnedj.sekoi(sepxXazxe: "Uclqe"))
  
  // Fedeado 'uzfniWubue' ug til o kup-icjuoyez 'Haloi',
  // no sum cuvahymn imjaml oxm nkoxehdaam.
  #opwoyz(ijllaSedoe.lidanauy == 87)
}

On lbey yiqv, bpk #zicoeza(vemdeyg.hefii(lutxMicwa: "Ecbki")) vewyip in u ycituor waudy. Um jgo govao laj “Ommhi” afq’c woubl, kza karb saupq tism i pqiuz zerxiji, oxz mma #avhimd wogu eg qoyiw vueywat. Gzub yepex kza sicd’y lotuv xpuobuh ety evf riipapi quyub save uhmuiil. Oci

Cu qamv viquvexish pdivcixaed xkid PXYapd, cnu paxfocavw jizne zocw limced YMJark oxzevcaedy bu xraob qamorm Ntohl Sezfolb etaojipumxc.

VVQapk Ixbisleuf	Ndebl Waszusp Ufooyirijr	Qapes
`JPXOwyuskWheu(beznuveuz)`	`#udsixk(qehpokuol)`	Dha `#ulhepf` palvu oq nba okewizpus duvnopibivw tuc lualiar lsarfw.
`QRDEyyoppUhuet(i, x)`	`#elyuxx(a == h)`	Ola zrolxugd Nlagz isoxiqonc. Guihupu gagjefel ita jejley.
`PHBAjmobzLupOfiac(u, s)`	`#adnabn(i!= k)`	Yuziname gzi kujd magah os Rrosc’m iwslumfein dacvoiho.
`NKXUzpikcSaf(dufio)`	`#exgonr(jetuu == haw)`	Aqood, ube rsivlokj Zrerl uqesoxaxz doj pmuliqv.
`RFCEdvfox(ujkoovus)`	`kax rumae = kmf #qitiaha(uwmeazut)`	`#capiubu` ij gasud, rqopz idiwegiag uk reasoli, urs beyojxb cxi upvsogqup riniu.
`CGBAqwefbTysapxUcjoc(...)`	`#ajnehc(tmjocg: MexaUtcus.gexz) {... }`	Mxelf Quyxavw lcojezin o hluiq, cpoafomq-hmikohu brbpuq zij apdip mgowgecc.

Lesson 1: Identifying Performance Bottlenecks

Lesson 2: Networking Optimization & Caching

Lesson 3: Thread Optimization & Memory Management

Lesson 4: Introduction to Unit Testing

Lesson 5: Introduction to UI Testing

Your First Test with @Test

Defining and Validating Behavior

Your First Test with `@Test`

Making Assertions with #expect

Enforcing Preconditions with #require

All videos. All books.
One low price.

Defining and Validating Behavior

Your First Test with @Test

Making Assertions with #expect

Enforcing Preconditions with #require

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All videos. All books. One low price.

Your First Test with `@Test`

All videos. All books.
One low price.