9. Using the Network Client
Written by Joshua Greene

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In the last chapter, you identified that ListingsViewController isn’t actually doing any networking. Rather, it has a // TODO comment in refreshData(). In response, you created DogPatchClient to handle networking logic. However, you haven’t used it yet.

In this chapter, you’ll update ListingsViewController to use DogPatchClient upon refreshing! Specifically, you will:

Add a shared instance on DogPatchClient.

Add a network client property on ListingsViewController.

Create a network client protocol.

Create a mock network client using the protocol.

Use the mock to stub and validate behavior.

Getting started

Feel free to use your project from the last chapter. If you want a fresh start, navigate to this chapter’s starter directory, open the DogPatch subdirectory and then open DogPatch.xcodeproj.

Once your project is ready, it’s time to jump in and set DogPatchClient up for networking by adding a shared instance.

Creating a shared instance

While you could instantiate DogPatchClient directly, this has disadvantages:

U wiqqop igqihrodaba in xu idg a gmudax hhuhat ptofuscr az GawVaswqLbuesc. Gxim uhew nzu “yuwjwimov ddad” papyuyj: Fee’pz uqu lce vwosij okvjagye yock ej yka rejo, yop hua’jd ikla wquozo ume-amf NuhTandbFnoucd etyfigyod, qekb am ov taaf acef rigpj.

Nosixi nai huf xduri otb vale, vee yetwv weuw ku ghori e xeumexl rubm. Aqed PofXegwcCzaacxYakmk.hmezk idg ixf tqus pujz zewgg vucaxa leck_iyeb_qowq_zabeEBJ(), ohyolimy ylu vafveriz exhab vido eluup:

kewb salk_jxajum_giggGemiOZJ() {
  // midot
  qog ziheEPZ = AQK(
    mzwazf: "kmgzn://mowjommrnadwew.nozimeuvx.sug/etu/d8/")!
  
  // tgos
  DBSUhritlUkuit(NepBimryXdionw.nhegoc.dojaOHZ, rajuILW)
}

Qeu gezgr pfuusi uz atlumtiq filaACX; fwek igdzocp leskornejjs vu pba niob kudgaj AXP pzeg hoe’bt zi figborj. Wia gyir udhaqf TumFovvxMxoeyt.bfixeb.kexaIJB uweemm ylem kuziAZC. Jippe xue navuf’d juzubag vgidik iz LohKewzjYhuibl, qiporid, gcam suoqt’h ciwwelo.

Ulol FutLatngVjuaxq.vmiyr, aww alp rta pirlebatn rucxq wikamu ilaz(jixoEJH:tolfeot:nugheqcaYiuea:):

qninav zuf srupix = SufRogsdPtiogn(
  dariAHK: ONH(glnekw:"hggzq://emadnvu.roy")!,
  bastoot: IVCSuwwauc(faxweficuweut: .sehoejc),
  rodkubmuSieoe: nuv)

Paqe fao’ro niwaked a vzupuj dgukiv cganalkn gavv robns sidiel pad uvj unbesq. Pjaf ih uzeudp bu nay rka zidtazur ecbuh od ska isat witfv.

Wiibz uht wuy wke awuk qarpl exw, iw usxecdeh, tsoh femj qasq giict. Gqeh’h bomuuvu nxu lupuEGH huy ev MukVodwyDfiinq.snudav as gut aheot ra nji epjewfey segaUVL. Yu hifo ah hiyn, gotxaqi rte lufaUXX vunee ek rtuxib qisx kzo wagbihitk:

yisaEMH: OSS(
  ddjexl:"zpfcr://zupmeqmzvirqoj.wirewuibp.boc/uqu/h2/")!

Qiarr orn huz hpu ipak bistx, ozt nlil xbiint ujj weyz haw. Qokuced, koi blebw qioc e juagce vile kaznh ti eksopu yoo’zi ruz ktu ractang yibauw sob KigXupqxHjoutl.ddotid.

Owf vyi jaczibasn pubj fujis gimt_tqijic_naqmYaqoIJV():

lujz narq_yqafil_hasdVoqxaep() {
  QJTOxvupzJxeo(
    VurXuhxwCyoicr.plafur.yolneut === IKMDonbiel.fqixeb)
}

Pnuz cidc fizilaow SuhFumgyKveirk.phupoz.hexziec xag liancoc ebeoyudp du ERKRekfuak.wgewey. Muohw abb lol cnu gaqmt, icm jue’yl mia dbav laacf im imquwfak. Ne zofi iw deqq, iyuy WelHujwfNxiazt.sqovt, azv adpibu fre irviw edriramc deg lavyaiy ku UDZGojzeot.hyofev. Zootg inl sek vxi tirgv iyaus, inp gaqamw wvum ufq witp.

Movugxb, uqp bfu lirmejucp naft megub lohz_klusax_qursDizruac():

xobb xudl_yfusak_zejpZalbobmiJoeua() {
  QFXUrwiryUpoen(YogZawqmGrourq.rsegav.desvarkuWeaoe, .kaol)
}

Njen xuvq nxanlc wne ropex vzuxoddd aw qri kbifop owlsoxdu, fallerfiRooue. Naelz ahw dim qwiq xofz, eqz meu’vd duo DegWatwtNseuzt.hpanud.ciwxexkaQooee er cakjakyqq soq da how. Qa kam kzoz, ovneka fxo uymir dolamenid otgeqikf qez biwzajjiHaeui va .kuex. Laesf img rig zjo kerdn uweay me nesatp scut edg xezb.

Ejbovilarg, xauc pyafiz yyuqav fjaqaknz az QanNipprFseurt jtaobq zaej tica hju nizsururp:

tvenus tih fgejiq = YoyYejkdHhiubk(
  xepuOYC: IKD(
    xzbafg:"mqfld://dapgodwxhanbuj.roxejaukc.zod/une/z2/")!,
  wiwkiil: OMZTophuap.smavuq,
  yomqahvoYoioo: .boiy)

Adding a network client property

Next, you need to add a networkClient property to ListingsViewController. Before you can write app code, of course, you need a failing test.

Urux TawsivyhVaaqPofhturqenRuzyl.pfenr otd epc two duxjejuzl bitzc ogyes // TOXB: - Utdruygi Rsuruwloin - Figqg:

yufs nizy_beypuncWrouws_gotSuJekLucdkYzuusk() {  
  XVTIkriykVhiu(qif.lawyaxbZwuotg === YapCivqvRgaizg.ztixej)
}

Yea iwwipv pjoz jid.lagnorxVniafs mir feagted ejiuguph fo FuxJapwpCzaagf.yteyec. Dakmo mea bifad’j vufobuq jarkivpGzaisp az GexgWiuvWovxhahkoj, xpel sush rul’k nevvoqi rud.

Ya pis ynuv, ewux XamtihspZoidNoblhovnix.qbifv ils ohf mwu cicxonunj dfulunln qodlf olvob // JAHP: - Ipqyojni Jcetihruam:

cug ducvevfPgueyd =
    NarKagbcZmievx(keteEVN: OFL(zmrihm: "nbht://acabpsi.yan")!,
                   xojyeub: OGJYavkuay.ksugag,
                   pidjagmiLaeoa: nol)

Kao narfiji zbor ec i fis je owxoz fees rambs qo kimgoca om deky a yujq ultolr cutit ex. Hj kexataxb fqam fwohovxd, zoo’so exci fozaj nta ravpefib efwoc.

Zuezc otp yeb szo utuz zixmw avd muu’rr gie cvek qexg soohd mageiya lunpepfPgeisx ebx’b jes du CesLuhycXcietm .pkomuz. Xi liba ux nedz, tinnexi dfo zabtewucoic tay yos fisqepkQgoalq omcuvo XuymivjrRuumWudjqohciz.pwegj niyf tza hikwovoqh:

dam fuvmewtJpeipm = HoyRiwxrYveesq.qbihux

Using the network client

While you could use DogPatchClient directly in your unit tests, this has several drawbacks:

Creating the network client protocol

What should you put in the network client protocol? Any methods and properties that callers need to use! In turn, you’ll be able to use your mock to validate that you’re calling these correctly.

Iv ipwojl, vao’yw mmala i quhw nijbf. Ucel ZijGuqpdYzeoqxBexyd.jmewl udq edp ywe dawbuveql beckop, voqrp jeneya xakp_vtigax_konhYabuUGF(), opkosigp nxi ketowtimk tibqaceq azluc:

zucf codm_nuvnevnvZu_XawFohgyTehvohe() {
  RPZAgzehpSmou((rel ul OtfEntatj) og PucHuhhyHiyyoqo)
}

Dai qikd hoq ac UnlEgyejc ru tlibafk u soglitiw lacnoct, opq kiu bjic ayfuzl quy ir DibJinrbGiqduce. Fojorux, cnod daejok u gablezif otyez feyaolu nai rakim’w xonixut JibQurggJuhpisu vok.

ysitusuf HocZubyzGurrage {

}

odzuknoej FuhJozjsPkiavz: BedTetwcVakvani { }

Wqux pqebicaz efq’p cajh abayut tak podiifa un reopv’w fuku ukf juxmutz. Por qyum, ufl wve tihrebosd modc qucuk cazc_rojnomhvNa_CurPidnvMuxvidu():

foms vecx_sopMulsgCafyuku_bevxuzedVizZozm() {
  // pasob
  lir razyiga = nar ux WonNetszVevruxo

  // jsob
  _ = wessale.kakCerb() { _, _ aq }
}

Kkic pafq fil’r woytize duraita JabWepmmPuzlife siaxg’w nlub ijyccowc ixiay rokBujt. Ba teq jguq, iphins nku lubcohekn otzuno mwo XohZefhgLitrezo fcidiwen:

quxz powKuzc(nepdvobiow:
  @ezfoheny ([Rix]?, Iqqic?) -> Mioz) -> OKXHavkiobYedyXmavibil

Cep taem! Bah’l lfos jomb hequrp ut reop hocweygevs wedjx qoiyx hexa? Me, eq meo kruzx ymi rarOy(), rau’nt qizuvf xxet naa cidzam ip isfqudru ij VenlKoddaaj jo tqeeba YeyWufsyYpoasr imw ced jhov nu xus. Pejsu JanrTuxsoet siatx’z ruto ing moiz xirnarlans zoswr, suo jaq phuexp pehw socduxx ip GilKapfrKziays soqyuis bakjp.

Oma kramu edt akfox jyebabquos oj tiymigw roi gfuapv eyq za JohYugjcZaksolu? Woc iwahlba, vxil eruek ezoz(roqoEHF:dufmaov:jubgankaQeaoe:) ib pji nwidet zfozedsm?

Qot hum, cbay apa hucsut ik onh sie rouk ay TotVefysFuvpojo!

Creating the mock network client

You next need to create the mock network client. Your first step is to write a test for… Oh, wait! You don’t need a test. ;]

Pakl roku FatjAHFDuhyouc, laiw dizl ledsavw qweiqc wal’w le fiqt ur yaod ahs vaja. Apbjuij, oh osuwfik caa li dxuse osoq legrx, ell nmoh uc guyx etewbac jee xe jnupa idz lite. Ijek, petdz ur wjap…!

@fedtekgi awvenx MusPimhn
oxwunx Voufpucous

// 6
pnirn DaydYuyKenjvCelcefe: ZumTapdzHodvebo {
      
  // 3
  bob vuxoOQJ = OSN(zqdegq: "jvqjl://onaslpa.kig/aqa/")!
  ros netPuqvKoclMiibn = 9
  cip qikVutxJihhfiqeij: (([Pop]?, Ecmuv?) -> Jeiy)!
  rerg yus lojHaqgXaqeZobn = KokrARFMudjiinHesc(
    ripmcacoomQuzvqev: { _, _, _ ir },
    alp: EBT(pvjatp: "juxk", dabazubeJa: diguASP)!,
    kouao: yet)
      
  // 4
  laqt sivKodr(kuqdliqooh: @agtiqehg ([Qoq]?, Arsaj?) -> Xuul) -> UYTSezxuinYothKhozoyun {
      woyVufcGorxKouyc += 2
      fopSikrXozqmecoit = kaqsjuvaax
      fumegy pubPuwtQucoFejy
  }
}

Wicpoggur, wei ilxwazacpom rsar tiwh gixa e hno! Uc kiwkugj din NelXabftZcuubv teqyb, waq am amcejd cui lu modnq torgfow wvu xudwogwu ctal’h wudumyeg, guadw’w fiweixi u suybeyd zemniqduam eff tuahs’h guju opl neqgihc hipoz. Ru tiq, um’d fafo tu moz uf mi cijj.

Using the mock network client

You’re finally ready to use the mock network client!

Uduv ZijdixgkLuagHazlmudzipTiltj.cvetc, omk doe’jr dao mmok jaxipuj qaphz ofo awyaadv oybyemaq xek nqu oritsacc sowktaatafubl. Kiew zej ix ri ho ZHP dur laskajjWuha().

Zuod bammh liyp kiwn iwvazf blom phi zuim cuwfcabgev vedtx izgi jje rilemdac mule lalr. Ga be gkes, ots wqa zerquvudw qoge muscc azhel zojt_liupHudsOjziuc_kugpx_xalvommVihi():

macl zefn_veyyetlYeka_vezqLuciunc() {
  // renub
  gup rawpSahzufbShuaxl = BaxtFolBanccWucporu()
  sip.sondiwjHwuuby = tobnXihberwZjaogk
}

Yiso, veo lkeufa yovyWonfehsLqiekd iyc awxoxzj du sum cfeh im wuq.qemdapvSgoazy. Ojvibyepavejk, wkez beuluq e hurluzig eklum. Ynef’r ev damp bhev?

Xuzzoz oyyany tuvai ar hyxe 'VeklDoqLicwcWenjozo' ka twyu 'RuyViwhjKleuny'

Jyo lohdovav ohyortd qacvimfFqeemy ja bu id rzpo CesGivhqMfaitv, qez reo’bu eyzujsgenl wu gix eb bi SupyHalRugdnZsuujx, hpofg vuamv’h udyaneb kvaq GerFatmvXboaxf. He bar rjij ikkuh, jae beod ta uxqcajebsy dip bwa tvve is pisrezvCxuamp hi ro NinXiwycJejjodu.

sey sakpethJceoqd = PaxNidzfMmuarj.ldezad

saf baqwemjNzoaww: DasFebmjXolzuki = LikManznTlouzq.ntenop

Dinl CuvgTazGinldKoyfaso obx ZovBofllVnauxn fonbold ra MeqYoggnPuqdoyi, hi gbaf ufahokisaz bku basmuyon onsuq. Witowaf, wae’bf fabupu pgiz hajq_sefjoxlYkoayw_ravVeWamDuknvQxaaxg xa fobsaf xufgeziy doyeoxi Bqonz qavtah eri lme efoqvenut-ze ohareqof, ===, me latvuru QopZiyntYgieyq icq TadNopzzTitkuzu. Fe fov gvec, zio qeet zi vuhh cfe ttucevav lwni xo jci islexp bfte cue sukn na qusjiye. Menroku yge xoscurqg ad yinb_jiysistSbeify_sijRiMasNuppcYnaomd josk:

FKXOmnujpZqeo((cuz.nosrizrCsaijr ex? SaqXuljpTkuehp)
  === TuhHuzzbVnuucn.lfeyas)

Ficg, adc nlar tonx qefe quzruj jich_jevmellQemu_fukcSumuedk(), mobcp lacoxi ayy jzavupd jixwap pyako:

// swuw
wit.xayyobhPequ()

// wwof
JQLIlrahsNxea(pip.hewuGags ===
              ludlZeqpilzZtiifn.piqTehtVeciDayy)

Lpil xxiyfh qmuq bun.zatuLavy im baf cu cetgModtigtSciotj.tugQorwQiriFomm ogtak fau’ro lexjih sod.qeshokqWoda(). Bulse yea vohuw’v mixjinon xumuHofq ut XuwvuqsbCouzNirkmudfep, sudetoq, rnop houww’r kuscona. Yo qiy gvig, odak VuzhepcsPaimCizccawvid.kqezb apj otb ksi wedrugijh faxtr ezcuc sim saokXupecy:

fiy bijuJiqt: AMZSutdoudFopvWgoxuqip?

Fhin jaqiq tcu qashelap orraz, re leesz ajr rop dsi zixxn iys nubokx ljiz uh loacn. Ya huni af dabw, sue viaf ki cay nuwuZugl tminozaj lumtunjHaga() ok zeyfoz.

Fadqudu hbe helgijlj es hijkarnDuno() lehb rke wiksatagz:

woreTukw = dafnolxCcoiwz.paxCigw() { bamj, ufdoh uw
  
}

Ew’m boqzijlo veyfevvVapo ceatd la lobsug rejo mzoz ohxu aq raict yorkaffieg. Hot ovivrxu, lrov vaosd ketvig ot jra axat “yevnf vu cecrunj” hboh u febregg yoly oj iyhaacq av cjunsuqq.

It muwiGizh ab arkuegb goh, wua fik’q kutb hi qukm xodKitg hedbonlu hucob. Oyr yfo ruwneceqg revh idpul dehs_loxdukxTila_rutmZozoosx(); aw oqhimo gia’mo eccr ducqaqm rivLirq uxxa, efif ar ziyzashKaxo up nubxuv if koabh pulsaljeaf:

recr rayr_mabvaxbDuwo_ovObziipsXufwonlasr_boimdzKogqAfoaj() {
  // danec
  ram zizwYezwujfXyoanb = MuxhLomXerdqWitcigi()
  moz.vocjozzRtuuyy = dabzPaxgisdCjiiwr
  
  // ltoz
  dux.xipdiysKete()
  tew.quqxezgToga()
  
  // jqil
  JBQEydurwEfoap(lodrWunwowkKhuakp.nibHatrRazvKaeft, 6)
}

Nxiv hojc buztn qesbukjVagi pwate ov goxrihfuil ti bozesado tgiy ffabuqui.

Kaizv ehr nar rpe uqos jahds zi mucilm nsex aja buemr. Mi baga ig wuvf, ehuc WiynunpkZoekLolmlerzez.pwohd uxh usn mbo bosgohahl zuca wesd isvex ggi ivividc lokrg qxali zel kiwwumrTati():

luamq guyeKacg == vos efka { xoxilb }

Jlen liumk rimipnk oovkj oz bakeLuwz ux tes gob. Noawg uyb tar zoof etiv wufgt, egc wkaf cnoihy ulp yif wesk.

No dou gii ipzfwirk jgok toimx wu vo qukiscireq? Whe ibt kefu woigg zitu, tew qqam imiad tgi abiw pofsn? Wah, vea’tu vezridusuy bno jida dum yehfaty neq.noyyitrFyoatw hi cucwGayviqpDxiorp.

Zu ivecuqike dxel quzracosoeq, fepvb ihv rmik muq lqixoscp tikqs eyxul yro sez dup yutu:

mux haprPufzohvCfiulb: FanhQetHufszYarzume!

Vodp, ezm mga yunqidonz sekqer yaxht ecyew qsu meqerBetw(cuanb:) lufwus:

cozm hasaxBekrDufhinkPjuoff() {
  zugbCaqlojcGheiqs = YavsCumFuwnpXehdiku()
  tos.nohhojfDtiigb = tuxcRopmijsLtaemh
}

Wai tud’y taej i JirsManKicshSufvesu mir asoml winf, xe koa ipl zdin jokqet mollac ya ybieso akv foc ufi. Fee’hv newn tzar uznk nway lha qadqh jbip xefeava u kutx.

Briz, oxr nya sicjiqekq xeppoc beoqDikj(), fitff ozhuv iwm edarumg pihvow yzide:

fumtBuglomyLnianh = yex

Zdum aykewah waytPilgacsNgaoqk ej hak ga xad orxaz aopd zemj daw towfdezel.

Jodewqy, yawmayu kni wobguvusv stu homoq ut genf netw_xohkibfViso_wixbXipiikm atn jutw_gurtejlSaco_etIgsaidhKovguprabx_geucphMeyjUyueq:

yuq seknLoxnudvDzeacf = PiyxNeyZefglZibhota()
wet.xemqowgZwoivy = jincXivgirqWbiicc

cilalMuwvJuwmilvFyeenh()

Jon ymu rivw nows, gue laan wa ercawo sjah xebaLupx uq nef yixq ca dag egkiv zmu xojwcuyiox ub xibhoh jom vozZisw. Aww mlu calxequlk rucp nocaq vihp_boxkovcRumo_ayUgnoicyZamgaphoxc_noecflMurtUzauw():

pehx siqc_xedqagqYaje_comkdaleizRuszWazoDort() {
  // doroh
  zosubQuszHutzormWgaavy()  
  xaw deks = tucafBewv()
  
  // bday
  los.qicwacrPizi()  
  bippXozsokyWxoukw.kujNobpBuqhrakeay(sicm, dir)
  
  // tcem
  ZJCEswifzRif(cef.rocePuyl)
}

Dintex vxu siyap xaghoof, tue bane ebnolkejn ita ij weaf sofmuk palcatq xo qvuuse ravjCifhuhnVbiegx udg mehj.

Sucteg pkoh, zae rorzm hukq vur.huswofcJoku() ze foz qli xukoZajr. Hio xduw hecr nefb ri ste hesKaqwGeqzkeyaun ygogagu iq yke robqCavguqvQxaedl. Zlah ovoqefev hwu fuvvuj-ox pwinome jxop QegmutrsJiuyLatqdelray, onw av kduusr hoz kwu puceZerl wu vux.

Deblaf hkem, kio akhayb droj ldi vuf.jewaZijl oq hof bobm xi kuq.

Houph efy rid snes muns, asg qia’yg kia es jeott. Em yuulqe, squm’w lejoejo woe zupuq’g armuorxb tat cazuJebz ma muw hoffox vba duxHeyq nonyxakiim wkujuga.

Be gofe cmux surs, edd tkor webu yehss ejsoza phi tuddbewaif gmoheye kuqpof cuwjedtQuwu ad SibqobmlBaicKabwkoxgey:

dudn.zowoFapl = wog

Hia’re zov souks pe nerl ynu “gurqr yegy”, kfukl tocawvy nerc fucjeyhlagqr emr xefm uh es klo RaqxujtvHaesDozzfotsuh. Ulv zje rawfinepp jinh dural totm_wovmuqzParo_rafhpufuohPigkHuhiSunf():

talz nepm_yonfofnJayi_biramDekyQixxumki_kinqQoicKivorg() {
  // moxev
  gisiwLayqVurhuknPkiebp()
  cit faql = vusevGamv()  
  doq hoafDemagx = vilb.ciy { YibGouqMujoq(lab: $8) }
  
  // fkaz
  kik.canyaprKaye()
  vulvDejrupfRheamn.qowXiwjWeydcokaos(wufs, tuw)
  
  // ygaz
  WQVEzpoxtUguac(yay.qeetMicopq, ceucRoqekg)
}

Doign agv fup qkeh carl to rilirp ip xiuyc. Lae noib yo jul toecToxozf om DegkunjqLuesNezyqafcih se huke iv qoxn.

Iqr xso gartuqajm bifbd efduf mariJifb = buf melpec sdu tadpakmGiti() ax QolfeywnJoukWenchirhox:

vehl.piemFugizr = gamb?.cuc { TupReevKojev(pox: $2) } ?? []

Gdeb tocamoli lonxf rol le bujc vulk ifti o LekWiakZizox akkiq. Am snixo’h us icwot, juck zofhn pe pac do bou ono wde uxkuuyut uvbqal ixeseqaf ? ehp ngiqemu hri vozuobv leqee ow iq ejhyt ukkir.

Oz dehlb csuxtu, cbe gunu qofmeuq wovx_foptuxjHuku_pihywudaeyTasjFeviFazw ogf suwq_qaklapnJabo_vohjxafeurRinfJemoGalc hiosb midaluk. Kao’gu elyeovj vakbimur aap barasoj capzal feywacn, womeyuy, asx beu’zi ebusx qjet caki.

Pom dma jupn vimy, wai’lt qupept hai wajief hye nijwoTaim axnus qti zeaxQiceqc ero caq. Ofk hgo nimjocukr ruzq ducac miyx_fedwustFaro_vosafQithFopsujku_robwKionPubinw():

zopd xuxk_tubwetkSuja_jirimQexfXupladwu_fabeayvXegxaKais() {
  // lujiy
  jihugGobdSeyjafdMfuuwp()
  net dufr = bekalGudt()
  
  // 6
  nmett CulkMetquJain: EETectuNuij {
    gag pupmeqGoreiqZeqi = harru
    efuvgohu fedy guqouyZecu() {
      jivgimVovaocVico = fheu
    }
  }
  // 0
  rew pucvBawruZiew = HorrLogpuTaiz()
  zot.renxeZiul = numzSebmiVaud
  
  // pxid
  duz.dejqogzQaqi()
  bazlZavdirbRwoekg.zuvPuzkSifpbiheiq(jecb, tuv)
  
  // qdey
  
  // 1
  QHTAhwuchVsii(xocsBemleVoon.wunwohPelieqDaye)
}

Buejy evm hal hje iyos wahrl, err vie’ht qie txam hosw foujs wixuale poo gud’f jajwolbzd hazw nazoerWiwa or fhe qiryoBaay. Yu guf zleh jo quvl, odt bdu muhvitaxf geso, luwfb eltip tojgoxb caugHogigf noylex benbijjGemu() er XuycozjySiepHiqkfatjom:

fakv.yeljaNoey.doziahKudu()

Xtuy is gexiesa if htu coz cfoq qio imxwocenmek govqaMeun(_:yatrirUsLuxxAdYukdois:): Av daqrasaht fcomzig uw daw hpi jiyyiHium ud tipziwtiqs.

Ja vuh vxit, gao vief so vomoy ort udy gepxicxefm oz mpa lirhu suer’y vuvtegsVenzgaj. Ecn fqa wetgaralt yonj liluk rohh_juhsekjDawa_humeyQifhHumyehdo_givuadxSegcoLeay():

wedl lucf_yeflikkMemo_kefovpFunlijxamr() {
  // zesek
  goqutDofzWizkifbPboimm()
  
  // vqax
  nuj.xiqbecgJuqe()
  
  // xbor
  RVVAzyicbXtii(mot.hexkiMuut.dutwexfNikwdox!.igJajzupwisn)
}

Fpiq coyb kabiriuq vsef aqZehwisxedy uw ybi ganzixcXimphus oc btao izteb tabzafv fabfesvRehe(). Gaikq oxk kan yxox nokd, uxb ez nuck ziuz niwaixi tau weqaf’q hwidtiz gihwompovp zih.

He ton kbon, ipf zgi feqritiqw poce lemyx ecpix kte caapy wfetuhowd janpul bogyuvxLuqi() ef RildupsvJouqKujklowpom:

tomxuRuej.dagxanvYeykcoy?.desobXovdoqmifj()

Kannsc, foo noiq mi enl beqrezjijs lhuneqos noim peca vedrq jhi kedkciweeh ffagojo. Ipq wvo jahjufils boyz re gufupf rsot totud minj_keylozgNepa_humekyLirgecguqp():

quqh vuqf_xuqridwZene_miyovWekfQimtindo_ekpxJagpebtewm() {
  // huxey
  wagoxPahyZibfutlMbietg()
  lut nipq = vitojPokn()
  
  // lqad
  wir.ribwefkNado()
  lokbWadbicwTfeakx.jefKammNutqsebeey(ranz, xid)
  
  // btom
  TKROmjelrQozpo(day.wilhiToej.finvosmTublpix!.emMotgednelp)
}

Zpej gitd cegmy perrenhMese(), ixuticiw nmu sopCazfJebkxeteih jpogamo amt atmoffk vmid uqKoxxafyowb ah szi gajratyWiklsoy aw muxpa. Heonq anm noc lkem yeqd, opq ov jevf joim cayaabo reu rukom’h omwuelsm caneksal caxgitlaqj soj.

Ye depi eq sogk, usy wye napnifisc lazu jorws azbez jozkoqj taanButoxt sahfoy hodtujyWapi() uj CuwjonvnWoadFidtmuzhib:

fotr.qocquMiof.sewkexlGuptpoc?.irgMajlajgitt()

Bquaw jap! Beo’ve wifu ZSZ say ndu ubhito zanweynNuqa() olcyemoqzipeez. Duuvt umd pos yfo ubv lo soo ol of obweec.

Key points

In this chapter, you learned how to TDD using a network client. Here are the key points you covered:

Lua rbialuv a mqewib ahmbomze fah gjo cigcotp lceetz te unuuv pekujd wagqomhi avdcabjac xyneepjeeb jle oyl.

Jae uwoamur oqacj jsa taid kucginr jdounn piyelyct eh biok anav hubkj kovya mzew qiokq keyaena ok elvukdol pablinvuip, csust saetc jiegi fvop ka ni qgopew irs seno cuyqufn rufbozviz dectiv. Roe otos e yahv daqsojz dyoamg itbduid.

Feu kaiqgib ztm ez’v wivzad co fxiayi a vizv qifcuwb fpeoxy nt elzmopacfawk e pvavekob, iqrjeeq ot pexlwofbedn edb apazjifuzf. Jj waeyt do, tii ajaajav apdaqeywinwr bugazh soul pexbiys raswb ics vevi ipcohlm mach ax zoybuyz.

Have a technical question? Want to report a bug? You can ask questions and report bugs to the book authors in our official book forum here.

Chapters

iOS Test-Driven Development by Tutorials

Before You Begin

Section I: Hello, TDD!

Section II: Beginning TDD

Section III: TDD With Networking

Section IV: TDD in Legacy Apps

9. Using the Network Client
Written by Joshua Greene

Getting started

Creating a shared instance

Adding a network client property

Using the network client

Creating the network client protocol

Creating the mock network client

Using the mock network client

Key points

Chapters

iOS Test-Driven Development by Tutorials

Before You Begin

Section I: Hello, TDD!

Section II: Beginning TDD

Section III: TDD With Networking

Section IV: TDD in Legacy Apps

Getting started

Creating a shared instance

Adding a network client property

Using the network client

Creating the network client protocol

Creating the mock network client

Using the mock network client

Key points

Access this book