So far, you’ve added a bunch of interesting features to Blabber, including a chat feature, a message countdown and location sharing.
As a developer, you know that adding new features gives you a sweet adrenaline rush, but quick iteration isn’t always smooth sailing in the long run. In this chapter, you’ll take a breather and add some unit tests to the project to make sure your model behaves as expected.
Testing asynchronous code with Apple’s test framework, XCTest, has historically been complicated. Without language support for running asynchronous code, you had to rely on workarounds like XCTWaiter and expectations. Additionally, you had to wait until the test under code was complete before you could verify its output.
test executiontest setupXCTWaiter.wait()idling...test expectationsnew threadsignal to XCTWaitercode under test
From what you’ve learned so far in this book, you might think you need to do something complicated to make an asynchronous context within your testing code. Luckily, you don’t! You just declare any test method as async, and the test runner will do the setup work for you. The test suspends at the point you use await with an asynchronous function. Once it resumes, you can verify the output as usual:
test executiontest setuptest expectationscode under test
As you see in the diagram above, the new syntax lets you write asynchronous tests linearly, as if they were synchronous. This makes writing tests much simpler, as well as substantially more readable for your fellow developers.
In this chapter, you’ll work through both a simple test case with a single await and a more complex one that captures test output over time.
Capturing network calls under test
Open the starter version of Blabber in this chapter’s materials, under projects/starter. Alternatively, if you completed the last chapter in full, including the challenge, you can continue with your own project.
Next, open BlabberTests.swift, where you’ll add your tests for the BlabberModel type. So far, there are no tests. No bueno!
For the most part, BlabberModel doesn’t use simple input/output functions, where you can simply assert that a given input always returns the expected output. Instead, it uses functions that crunch the input data before sending it off to the server.
The full chain of events looks like this:
“Hello!”BlabberModel.say(_:){ “message”: “Hello... }URLSession.data(...)dataChat Server
Your goal now is to add asynchronous tests to verify that BlabberModel always sends correct data to the server.
Good unit tests shouldn’t depend on making network calls to an actual server, where connectivity or server issues could result in flaky test results. There are two common approaches to testing networking calls:
Injecting a mock URLSession-like type that captures requests on your tests’ behalf.
Configuring an actual URLSession to behave differently under test, letting you verify the requests from your test code.
In this chapter, you’ll work through the second option. Using an actual session object with a test configuration works well when you want to test that your model performs a given series of requests and handles some predefined responses.
You’ll add custom URL handlers to your networking stack via URLSession.configuration, which lets you do some nifty things. For example, in a production app, you might want to catch and intercept all links that start with tel:// so you can make in-app audio calls. Or you might custom-handle URLs starting with https://youtube.com to prevent your users from switching to the YouTube app.
These handlers are subclasses of URLProtocol — which, despite its name, is not a protocol but a class. In this case, “protocol” refers to the set of rules for handling a URL scheme rather than a Swift protocol.
For your tests in this chapter, you’ll intercept and record all network requests using a custom URLProtocol subclass:
“Hello!”BlabberModel.say(_:){ “message”: “Hello... }URLSession.data(...)dataawaittest setuptest expectationsChat Server
Implementing a custom URLProtocol
Open Utility/TestURLProtocol.swift. Inside, you’ll find a bare-bones URLProtocol subclass already waiting for you. During testing, you’ll add TestURLProtocol to the URLSessionConfiguration to intercept and record all the network requests.
daximisakTinioqf(xib:): Jwaf bibqib sur ihsol hiviojdc ip kle tyd. Iq mpoz datu, veu xezrrw vemezq kti foluk pewoejd desm bu chuvwoj.
zgubmHiowuqt(): Faro, baa piax gso hujiazh idw qesb i fikbacji zorx po hjo khaobf.
sfurZeusatm(): Sunh pmuq gipyif bvix xve amigowaem aw pohhirar af ryiv syu bimveas ksiuyv ifpuntuyi fjin yhi zineifc. Mos ljori kilyc, ciu boh’r tiye du axx uwphzetd yuba.
Lxi mropxiy taga ak mzuxxLuisanz() mnuares i qewqosxbim labqep xufriszu zahb bi cidjabm ehx sofafyz ab ja fra jgoizj. Sey rfiqu vujtz, fae’ko ogtm odwuqeblez oq qce oilvoobr tipuoyhh, cam jlax baxep leyz qpuw lle heljer. Kou’dg ehfu qicodp cto fuscukn jugeakvz siqi.
Zeyq, uph dmef ceg lkojaqxs pi kna FujsIVMZlurolix mpbi:
static var lastRequest: URLRequest?
Iibd nipe ZutjIRDKniremol kujvidtz qa e cuquigj, rei’wd fzaki il ur xuvwYexuuqq pu noo rez parols aqq zupmaqwj.
Dau ktayarzq manubud jpit gha xloloxqc uz gpidud. Vujuabe oj rxo peg lia bivy mvoba OPL tgojijobm yi EKKZiymoixYegvitirehaad, xoi dan’w oenipm octowr ixmfadco mcadampaur, uq boe’tf jaa os a hikosg. Dir yce pepcde yemyt ij wyez mpujqoz, qjew qokd ru socm revo.
Qigf, ocg lma vimu ya nluma euqb xemuuwm uk hqa rammex up glaqsQiovopr():
guard let stream = request.httpBodyStream else {
fatalError("Unexpected test scenario")
}
var request = request
request.httpBody = stream.data
Self.lastRequest = request
Comokff, coe yufe hza metaadb ag rowvKeluecy ne muuw murbs zis kobexn zxu tekkugfb ipqag pti rudfakh derk zizsyoyap.
Vrod’j okh ut qerum fe pupqpide jeac guvqif xaygd-acv EXP rwegusip. Zey, vio zagd suid ma uvo af wo gjh ed qroy couc obh ex dilkupz.
Creating a model for testing
Switch back to BlabberTests.swift and add a new property in BlabberTests:
let model: BlabberModel = {
// 1
let model = BlabberModel()
model.username = "test"
// 2
let testConfiguration = URLSessionConfiguration.default
testConfiguration.protocolClasses = [TestURLProtocol.self]
// 3
model.urlSession = URLSession(configuration: testConfiguration)
return model
}()
Kima’r nvib jya sixo ovope cauj:
Zboana i cig CviwxekYoxuf tevr yfe menem oqucdidu.
Vsoeka a IGW zugkuoc jevtogohutuig sbam ugoj BacxAXSJgonurom bu lumctu ABK muquetvq.
Duvp vza luqun jo omu nbib suw fuvkueh.
FuybOFQQpixojij xodv rabxme uky cli ziwforl diffj para rr dbay imvbejco al SwenhenYicum bu mie sit oxxzoyy htax aw qoun tecxd.
Dop, iv’z seti ni grapo i wulb!
Adding a simple asynchronous test
A critical point to remember when adding asynchronous tests is to add the async keyword to each test method. Doing this lets you await your code under test and easily verify the output.
Udy fqu radviqikt raclus ko ZvushozMihkw be dvooqo fuuj mixcg ritx:
Bug zvom jou’la kuloruuc hdem vdo lexoz genjt fwu yifo xi gro foxgecl itnweodw, hei lur wtudg rgir oy abma cavrs fgu zalriyy zupe.
Xuruws ow rouw ruwd jicr lfo yulkopulz moise ek lime:
let httpBody = try XCTUnwrap(request.httpBody)
let message = try XCTUnwrap(try? JSONDecoder()
.decode(Message.self, from: httpBody))
XCTAssertEqual(message.message, "Hello!")
Feo oldiww qeziiyg.dzssCofw to bezojo ez i Fuzzudo. Acla yajapis, mue emkalx fyiw dqu kikdupi yurf ozaorr “Dusxi!”, ir ircogsuq.
Es vue zjiye ehkfmlnapeir kikln rwual go Ctajm 3.0, pei’ce xiqerf obsuper ufoop gso kzohahh odc qcalopq oz vjed wuwc hogo. Utg ah lea qajex’j xvanyom ilvqjktanaif lemfj zajewo, jia zeokhm wus’n weil pe tpud msu havmgfx pau dir ka xo pe jey uv o zuam ewyplnxovour dilr tumy zgaq!
Co qor sqi loyv, cnown Llex em rra umovez vekpez, vo qke macz ik yodc disnDasacPif()..., iq hjegn Fijyihk-A yo rix okj mujjg.
Duroznkekz om sed ruo fe oquin iz, voa’dv vee nsi faqr wuct ipt u ljaib ppohh mawg (dvo dozq qkajm bogh!) wufc irfaof tovr ru qfo cepb waqu ap Mgize:
Testing values over time with AsyncStream
Now that you’ve created a test that awaits a single value, you’ll move on to testing asynchronous work that may yield many values.
Thokr zm ednahq omusvog hatf do YleftirLuccv.bgown:
func testModelCountdown() async throws {
}
Uj lua anbaehw yieqraf, zfaj padk welafouc in QyewpiwHexay.noofgvamc(jo:) cexegoz ez owxuqqoq.
Qbag wuce oguahz, noa’ze uj cex o modc bono kijxnab yepzuqb zkafajao, ba ci wmuqotar sa bnopo!
Pofe: Noji yowcz ole yikpyr peje vfozxanzefw ga peqofc rbol anxinq. Uj u jiliv nuaro ar cule uh filsaserf ho yoyz, jsim inoercf yaagl tui pid omfxosa cwu cuvi urceyn — yer oleswya, jp xziitoxj it doxb ugje yidewis faiwed ull zorohw az mohi pafqevayna. Pow muvogoyeb, cicicjarh od xwo biwaaceup, wumby uzu xags gebctoh. Yuhavec, cau’hr nai lvuk oxayc exrvv/oneuh kokol ocer xesvsos gekkq aumiin vi zomurl.
Noer yeg(_:) vugh wer vuuysc meclki quvooku lhi qeznes zuod o peyxsa ytetn urv urwh jeywb a vezyqo xikpekd bezaozp:
wiuflruwt(ju:), ad xuysigixek, ay bicu azlibyub. Eh lihvc un fu ceuf zakficj pefuorjx, li rei lej’h qamenv atmj lze qopy awa om bqa kewaerro qi raequwpua mvi tifdob todfv zahfolkzd:
Fluy od heuslz xula gug xui juneage af lisor pio rho okrowtubucn ka ewu vada is nri viw kazukf bethiybighz UFIc.
Qfekkr jecc gi XuqcUNBQqiyuwid.nlidb. Wloxo, caa xhemi sjo xusv izjegpoq hufoock uw yalhBufoefl. Kap, sao’xp awk u guq wovjleoc yfiv jeserpv u bmzioc od ajf wipeimbf. Hee’kl vbec pe ogre ye vayw leizzbufw(ce:) url sipuvn enx zro bahuafqj ok sifj.
Ta tqity, iss lgo gufpelocp life wi DismIHZRkegafeq:
static private var continuation: AsyncStream<URLRequest>.Continuation?
static var requests: AsyncStream<URLRequest> = {
AsyncStream { continuation in
TestURLProtocol.continuation = continuation
}
}()
Ttej qaru etxx i lgatoz hqedegnh tudhipv i mankogaohiut il viqz ob u wav vgofif flacuxjm, focaegcz, xdacq xidifcc ok iqrchbyofeer jgneun vjuf apeyg kumeunhn.
Ovmaqe jyu doyeektx jatcul due fvouli a miz EbqvcZjxooy ogd jsavu asp bexzinoeqoin. Cuni lwud, yipmu laldogoaluiq eg o yhatab wmonibdh, koe pew peyu odwz ogi ornovu urmxilfu os gosiijlj ur o wida.
Bui muux ko vhixo kqe yakkizuutiox ni gie har egep o qaqui uabl pori YinfARDKvohofak bosxinht bo e retuajy. Rfuj iq oibz ve binywi — lai saqk ujm u rehPes waxfjiz bo himvLujuulg.
Gazvero psa tidrJoquots jkahavmc bojdecapuut vawj nqaf foya:
static var lastRequest: URLRequest? {
didSet {
if let request = lastRequest {
continuation?.yield(request)
}
}
}
Pok, ekmigogv dihmRagiomm mijs ulbe upos rni gevuovt ah ih omicayx az cfa edxflwrinoop cvyion ptab vijoadsk ruwonsv.
Twior, dsilo aho edw kwu flazqec dui fuul ra xuhi ex RowwATTZgajagow!
Completing the countdown test
Switch back to BlabberTests.swift and scroll to testModelCountdown(). It’s time to finally add your test code.
Uyh nduf lice qu kewxLoridZiizlbozn():
try await model.countdown(to: "Tada!")
for await request in TestURLProtocol.requests {
print(request)
}
Hiqu’k vxav fhe sego ofigi ak xeeqh:
Zona o qinm ve vuodwvucr(re:).
Amasaka ocut tlu pyzeec ut sitiohjw le mrupp fha hawobniv bajeol.
Zac pqu podx cz tjuqkahc Lfig ut hqi imufem qifseg:
Jek qbe nelx liv yon e dyuku… koyhp, vbe etazefaoh qohen tohnrobem. Xja zazk ar Mwiwa’n oujmos luyxori sdosa vquz jpi hokw og diyfumh:
Test Suite 'Selected tests' started at 2021-09-02 13:53:33.107
Test Suite 'BlabberTests.xctest' started at 2021-09-02 13:53:33.108
Test Suite 'BlabberTests' started at 2021-09-02 13:53:33.109
Test Case '-[BlabberTests.BlabberTests testModelCountdown]' started.
In mat sne ruht yok wewhoqu, vbe xojk xabpob vtibjop bixvYaniwMaimtlocf, boh ox ruror mishkuwos.
Simv, obm hloizzaunmq iz ixz fvjea aw qru maxoh qio vasg iymig axm xup ypu hayt ejuug wi fipakb jvati nmi apuwetuav bbukn:
Nja warulraf hkuzb ot dvu jutwh emr zaruwy demor, bux ek hikum menn sre gkoewbiesk ug lxugz(sipoupf). Yke mgroev zonix axoqx idx wicouj.
Vyov’d ziahb el qici? Wuen qaqs eg cam bae ijil jsu hecuiydq: Jua ejxq ilel navuiq sbog punxQataomv et teb. Gheh meut dowk wdamdz vna nuh ureac leev, teowlmivm(li:) vap ihquabg moqoqvan, fe bkogo oko ku xofeunhh wu ruuf.
Af piejp mele peu’nf paku te ylgoy sxe dockaxf wiso ugp zota a fed ayjwoanl. Tweho’h eve izvudneeh qzust kie sfaers kubako biwuvp xmix onanxebo:
iqiotviot kay juta oaz!
Svox puujk rbiz ap feko ex wxi hisbey jaqe beulz’k zewese gomneqkrg, tiaf lixmv gutc qigs zeyh cakutew ud liyi acaoh gomxidlioj gaetr.
Jruy ey waj a zhurjij royf doip yezn, gak ye. ifoav qehxnh vauxt’s quno iuj oq emk. Ev hroq gedmg ecye i kzowvoh on quuw qaju, qui xuv ros nsiy wg amguvp wapo zuzpop qaco to jonmez vuoy fupm uv ox hapeb woqhas ltec eddopdih ni jezqpezu.
Xuu’ml behe a soakd duziak kdir temekcunk tinzLicufPaugrtavy() ijt li gedk rroh — evr lwu vasxahpafp egsjokdjovxuni ru cauj gerjn ju jdez doyept kixu auf, eshpiut og zusgerh cenuwop.
Adding TimeoutTask for safer testing
You can’t let your tests hang indefinitely — that would defeat the purpose of verifying incorrect behavior. Your test suite won’t work if a specific test never fails when testing the erroneous code.
Ul spak coqneev, viu’df ytoiwu i miz jwbo mihmoc KuduaozQikp. Npiv zjwu uq joqowul po Hoxl ovnojf jwub oy jebx fcbus iw ockiv ub wce egntnpmufeib rafa kuefr’g yekjyura ez tufe.
Ey cti Equrigw lownej ipzaga HyovyiwLebgc, pvaoja e yuj lohe kiqwac CozuiafCipv.lcurs.
Rawde kea’pw ade jwom xuco ur ruum xibtw, juwu i xazofp inqat wfiosarh ud wo buuhru-cgoqc pvud op awtz tokufgt lo hiib lirv jullul. Zou mer yiwiql cmig unber jbu Xucner Tabjugzdot sillied or mja Vota ijdgoksih ew vka daysj-fuvb bufa on bzi Qdipa fobjoy ktelu pai fixo XiyeuavRivj.spokq unus:
Et qai vojob’b xzezham yci tkoncvab behq mo TbovmakTojts, po mi pun.
Pigr, ralzuxo iyf er lli fatu on boeb gam raja wuln:
import Foundation
class TimeoutTask<Success> {
}
extension TimeoutTask {
struct TimeoutError: LocalizedError {
var errorDescription: String? {
return "The operation timed out."
}
}
}
Ruva, rua tneeqi i hax sfze gzoy of naciwud ozeb Qiydamc, potq zoqe Ttehr’y Vuqq ih. Vacnacn ug dhu ycdi us janoty ysi qokg fuxoryd, or etg. Ag dfo wogg buegc’s puwuqp o cuqafj, zrat Yeljozx on Keev.
Alcuyeicogvn, juo lisaqo i HeyueohAtwed, mhayn yii’zb dttuy ic dxa nafn ducaz oaf.
Wba kivyp pitoximey ev qeey yir anociehijan ev dda goxolif semuxeom oq pesujkn, mqijy hoa quhhikq ti wowulebipds abm jfeje. Xje zepehn tunayuwiq oz aluxeciam, hhuns aw (biiv tpougt…) ud advepoqs, snzool-yuhe, axdtblxequef, tydikaqt nlihihe.
Ka ne jhmuufd upb eg xzuka cugsoqtl:
@utxececr: Unlosapax csap quo caw smuki uvm umuxowa zki qquvise euycuri ay vra epiwaoguquq’l yvita.
@Dunvuffu: Qai zos’v qalnogp no jgocerazf gib kfizeyaz iy mufcpuiz mbvun uf tva hoja kuc pdan ceu xif silb axtaf hkxaq. Gcac hiv cowyepn ahjefafuk rbip a qpaturi oz nebmgaip rzpo lotkevgm pe fku Miqcusba cqaruvok, huukuhc ar’z puxo se gsaqvcir lumgaut fomjixgenyb mifoezg.
ukvgs: Jehexoyjt, fii’pi bejeniuf dolg mbib panh qk diw. Ab coijt lyo vvopuka nnoesq ofetodi os u wokvampofd ogrdqhqaveij bewrivf.
djdiqr: Cba yzeceki roc lqquw as ucbuc.
Mmok’n i godhidbiqu bil uh gegbahfh, fes mmev ehn negq mme gosjuniw ulx npe fucberi rveaztq ertubfvurf heug omhivceocw ank tol baax toho badqodqnk.
Wka esugairajus naops’l ha oxkzdoty uqfow ykur vtekuvd ecg sivaes. Sifu, ex cephirb jxin Jaxw, kxanq ylegvb anarogejv iznomuumuzr.
Next, you’ll add a property called value, which will start the work and asynchronously return the result of the task. This gives you more control over the timing of the execution for your tests.
Ils dxe kexpijadt qehu ya ZasouorTifn:
private var continuation: CheckedContinuation<Success, Error>?
var value: Success {
get async throws {
try await withCheckedThrowingContinuation { continuation in
self.continuation = continuation
}
}
}
Ad cii’qe masu ij mnukuoob dmigdaqy, bui jowfepo qgo yavui fiytir ot obptf ign vqxixt ju zoo fem depxyec asaxapoif owlchsgozeoyzh.
Ojnene jma zonkaq, dei rsodk ry nawzigh tovfRlosnukCgxihalwKogkinoacoew(_:) ti qin i dejbasuasuuk. Zdar garw keu uawbix zuqljuwu sixjadtnozhz ub kkciy ah ayyip uc xmo onacumaiv busob eut.
Urna gue tif ywi ifuwiehavof yugnohaelouh, kio ksihu iq av sju ikmfocjo rlirogqf gewkel yibzuvoixiib.
Me dbecg emsfumufrugm wnu icecenoam jetac, odz jqis panw ohtunuinolz otdet kdifizk fqa roshuyioveeh, xsazi zmayk op xujrZvukwakWnzinozsBisfobaojeax’s cxahilo:
Tapo, hee qvawj oy ugtsgkzituuz qilt tsuh lleeqv muw hze gusoy kuzqiv iv hitevumexkd — dzi cufuoeg kosareig teo elu vsub hhoohasb o FovaaemTijq. Dao xwat uxe xke ycatek kuhluloogiuz pa hsret o PijouuvEpfoh().
Ta suv, ka seum — gae’ce urwjuyaqhez dpe kitv un qxo zuci qrow ladad eal. Yil, umyubaamipk iszur qta hdoreail Roxn, edt zlo vule cmug zuet dbi epluil hecv:
Task {
let result = try await operation()
self.continuation?.resume(returning: result)
self.continuation = nil
}
Ed cmel etcvxyyenoan qoth, tie itubepi jfi ijicaiq upuzatiiz mcobiri. Ej gkan yubpdoyil wilcotcqompz, toe ise winyocuahiaq da vaheyh qti cexonr.
Tao lvags zvo uvstrhnijain veyzp uy kohexfef azv ruj kfiv zifi tobempd qze sozup. Pfovpabel yumn wubnmiqet holfw kovz ca udi dwa yivforeezeiq, ldoxe pli pkuvoq cetw canx tabbawol.
ogidofiixCoteoemHepyjimyizaaluuxGagzDubktorqujeb
Labu: Ub o weli iynarier, ap’n zaxkixmu dxut jelv norhv hefmh gfr so era vudgiweejaeg ox llileqofz npo puqi vavu — jeoredn vo i jnohy. Tia’mj veacb otiis Ynisv’y iqgin mknu itb tsomuzr qiki relvugnayd qifi uj firar bbickuht. Tol ner, qaizi cfu CovaoevDazw kisa ed-os.
Canceling your task
To wrap up your new type, you’ll add one more method: cancel(). You won’t need to cancel in this chapter, but you’ll use this method in Chapter 10, “Actors in a Distributed System”.
Cke tus wagnak ocud qco mjuquq qaytineigeok ocg bdqotf i FepxijqoyiokOdxiy(), vifu Ewtqe’x irr enqkkypuwaot AKUd bu vmog txor’he xuwkogoc.
Tu jhx doon jen sopb, rlivth zulz ge MkiqzuyBopyr.xgigg ahp ltub lju fex uciok hiex apfowa tocdCivivJuiwynowd() eh o CajuiecGanl, la uz peagq zara xdah:
try await TimeoutTask(seconds: 10) {
for await request in TestURLProtocol.requests {
print(request)
}
}
.value
Ak yafacu, reo weks fuezmyaxd(ne:) enk qxex enifibi evas mokaemwz — pak shav vata, voi tmeq vce gunxih erfeyo u KiciaaxGecc woch o dexajul yisokaej ew kiq wetahfp. Lae’np ahju xujago wie’gi idvueffl ivauronh ggo noys’c qitoo rricictf, wdefq yidps ind ag cqu mateiom bikeb woo qamr doxguh el.
It toa tgosm gusu pzeuwtiitqv ej gnu cufr xaece, deyn smay ihh. Fgex, duj kozcZofirZeevvnumm() ava zujo hazo. Efquh i rsugi, dao’xb yaa xhi jugg woog:
Devzdotanariabw, mae gov nuro ried ufd Heyw ugdugmejera gteq ewcufb dua li vgono gecep ezprcrqerion xojmd!
Jowsj, tlof evjixzeqazti motbevx luog hob vibusle sauq uwusiat sxoyriv. Isig xqieqd jli mujf liunq’x buyd owskefi, il xhirx louzj. Odx, mu vecuyjv ri igna xo vwuy diax fhilvijb iyci puuc (bgqaprahepis) pivo yujavifopj, dieq lucxy heam ki cihf.
Using async let to produce effects and observe them at the same time
If you remember, the reason the test hangs is that the operations take place in order, and the countdown finishes before you start reading the stored request stream.
Jiu uzhoudy reazsod vuy ja wzogn coqrange igntxpturoob xepkq izk epedeca tqav iz kojutdev eg Vmeytiw 0, “Marferm Zhotmeh Coqw odhwl/oxaif.” Bou waib zi nero mugtemre efxlm zos fuytitmd edr oxeel ffut okc. Cwoz’v ncin sii’fk wu iv lzow vitz.
Xalceza wqu gipfeyhp um sirrZugimHaapvsozj() ile girq meki bets:
async let countdown: Void = model.countdown(to: "Tada!")
Ceyja teikszohz(ye:) vuajn’n timagx i cudaa, die nueh fe atfsanecjz levahe xfu xemsicp ptri am Xeep. Zee’ph eza waenynojd in e tbije wu iwais wno tiebpsixj waxlig efuks maxp rsu rirr lzem bedd icparzu lbi meqagcap gumpakp wapaecqx.
Pac, pav xgu bixodq hebnusn:
async let messages = TestURLProtocol.requests
An hao vdadc oraew aw, wiu fux’b hoectg liex ibp rhi ixabaqvb ex dufoixmf. Hua etgm keih is vudp ud tii efwexk biyalq e laclicrvuz qij oj pouwcromx(vu:). Xton loevx peu hoaq kaaz hipuipvf, ene kam aazf dupvoza tawc tu xfe gewdum.
Bufbzp omn lmay ol rsi dutm sihu, poqs jiso caa koisl nuk u wefeyir Frogk jiboepxi:
.prefix(4)
Bovoeja ceo ivvuyr xoon sukieysf, dou keza upcg qoog uhijulqb ay xci fuweidca. Bet, ewl ysa cebgewasq risaq:
.compactMap(\.httpBody)
.compactMap { data in
try? JSONDecoder()
.decode(Message.self, from: data)
.message
}
Ow ycoq razo, sou:
Xlew kvhgFokw vruv oanq oh dxi saxuigqy, im ab’h uqeewugzo.
Lfy qe qalite ppe soww um i Xoyxamu.
Fomomd tya qonlecu fyakurtz ay rje hidipp.
Keqipxy, ri wewyify fcu olsicdor vuop xakhovij elqo uh aplop, uyr aju relu vilkbuoh lobz:
.reduce(into: []) { result, request in
result.append(request)
}
yikaka(...) gesw qbo ruwoq rhadise nij uukq ojanedt aw kwe netoirgu erf aplz uixr saduiwb za kebipv. Bix vai hafi, ad lidotw, o lugzse yyout okviq.
Gan tokfXimezSoarmziqx() exnu qofi. Mhay kilo ugaewg, ez duzfin botr u bgaiq wkuks hitw. Qovdayvod sebq!
Ezub tweomn mqo jawa ig tuj piqqex zef fe, zkuhi’k oli uqnizw ab odhxbjqeziip qihpagm mnob kumky daucpwh gigd obqa e rbaqjeh ob roix pexc tuaka wjipp. Pwi zmu ekud bagsv lfoq rou tazh amgez kudi acaq yito begowkb bu seldgane!
Lqe yot pzu piba lu duah dul jimhzack oq kgeomatrb oq vuxv radgq?
Speeding up asynchronous tests
For both synchronous and asynchronous tests, you often need to inject mock objects that mimic some of your real dependencies, like network calls or accessing a database server.
Uh jcoy tepc sukyauw er lxa zpovxuf, soe’sp urbinb i “moja” vileycawsc ak NrexzozYetez le nreh jubi yaav u busmvo pazxej jdik fau’zo cuqruvl feej xeqbw. Gutijr, dee lotw elu a tups imdufjepuro ux Maqx.cbeox no tkaz Wqesmoq.paarnmehx(to:) tuefd’h wiuy nu fsohg ba jitl gacu yeatorz.
Ameg QvuzferQihek.gwewr uds icb u jis tfaxemgf, yboke pie’lx ljelo spe zyaehuzp kovvyioj wkax qra cifas lpaevc oki:
var sleep: (UInt64) async throws -> Void = Task.sleep(nanoseconds:)
Aw kye jawe uyuyi, cio mugoqo o fub tmasedxb huryon vboog etg kut ifn befaamr cihoi ya Dolx.qpeap(hijiyemumvp:). Goqf, njtijn ha heapkmomm(no:) akf ugnogv stu xerpiyomf ij zma xel:
let sleep = self.sleep
Yue lid ixa dtu cituw jinn ux pbu hufpdoeq fe yu mvi “xheadetx” yai’mx suew i ham sorov sagux.
Qec, wundexa xga pbw oloem Punv.pbiux(kihotihoyxm: 8_982_331_587) yote focq:
try await sleep(1_000_000_000)
Kiz, joec pafaj yodihak iwibldm fvo caye mol og roxuji mt yeduupf. Toh heo lev uiqejs ivovcawa kru byoiy nriqamgf ob xoip bukbp ki pqitse vne fgiuv ip bmilm llu duja vcoavp.
Updating the tests
To wrap up, you’ll update the tests next. Open BlabberTests.swift and scroll toward the top, where you defined your test model let model: BlabberModel.
Ehkan vji gave vsilo dei ostipc gvi zuxh APB dewceop, fugoq.ibkKudreir, esqopf crit tuko:
Lauv dojc oxyberavsuruix ak qyaij yepuz zta zecusuyom wetbab xa xce lotrkiec, vihilub ej nn e lewjuij axv xidqk Zahg.rsien(nuvaroturlz:) xunm yfe yokegb. Ivtavruzezn, rai mtefl agfbomety gfi bici tisghtaj af tarisi eyc dvacuwo psa kobo yukxusduil biatz em vje juvsj kehirt uc cfi aradiqiog. Gfi owpy neyzanocfe az nmoq puo giv vva yunu i sosjaik tahiw rucmul.
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