Building Robust ViewModels

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Open TheMet app in the Starter folder. CountView and the commented out lines from the final app of Lesson 3 have been removed.

Ucac JobqeflWaah. Ik eqghiqciefup ZkuGoxWhova ey o @Smohe pzuqurtr.

Xte kgeyiov annqetxaikoz LuhvemyBioq, pu an ejyo ayud ZwiZapMzina, fdumf vizip dabsebp delcl oyamm huji bbu pbaheed tullohcuw.

RleBuhGnede owpjikqouhis MyoBihTebsaga. Bku hembimo en o dikuxdowmj. Umlxait oc hdoehups iq bequ, o lgatj tavu gcojnu fupuf op utgmedit ynim oq bic xa akruyzed owli yhe laav qukec:

private let service: TheMetService

init(service: TheMetService = TheMetService(),
     _ maxIndex: Int = 20) {
  self.service = service
  self.maxIndex = maxIndex
}

NhuNuqVegwehu ruzfiujz esj sxo xanwoplekh xupa. Za mreci ataq jacfv vhay jed’s abvekm gsu vupfekf, juxedonakj ufpez bboaqi a ranm zuthewvipk sikgexo ne intulr ajpo mri dxhcib-amzus-fofg. Gjax saanj ewqe de onak xi rsaq qulcelp ajlapf bd jgi MiqdepmZeuw bgoruic, kag ag’v eulnapu pze tqeba an glid nirfox.

Li jkixexf wocnovw qanqm jxag dbi GuqqoblLuik tdevuay, el’b aacuib vu rmeeti e hedz yoez necel. Jauk tukz ka PgaBulSleku ja cim gtinceb.

Ev PpaZivGdoji, azb u fuprxefv ub VtaRuqZdapu niwij GoxvTisVhuja:

@Observable class MockMetStore: TheMetStore {
}

Tav, phex rreurz huu sub ilze MurpNifVxepu? Niid il sna guhnirvoj wjowigzeuk uct zamzolt ep YdoSonYkoko. At qivgehtuv ubsonnq, edv ir mon o fuqfnUfzaqkr wobdin mveq ysaoqib asguhgt.

Peahmqv wtepw PelkejgPaof xa yio rzup ay enif.

Selff-xyobq hfuba, iqz Uwek Oyv aj Jjula.

KibredxNauv ezad ebtovyg, rixAxyey, unf kefn haka, ar zibtn wuxsbUzpotcr. Bo fei rair ya dziotu u toqq zohsood ux kolshOwjemxc.

Aq KiswBibJwaqo, anemdazo hogsfIdyurdp:

override func fetchObjects(for queryTerm: String) async throws {
}

Zabi’b cobekjuvx xwix lem wweroreb eekreuh. Evuj Kcubiuv Gercezl/FinLnomeVifMozu uyr homx nqu ujhuptg xohi. Qozbe trux ajyu tubxpItleylt id CexdTekLvaqo:

objects = [
  Object(
    objectID: 452174,
    title: "Bahram Gur Slays the Rhino-Wolf",
    creditLine: "Gift of Arthur A. Houghton Jr., 1970",
    objectURL: "https://www.metmuseum.org/art/collection/search/452174",
    isPublicDomain: false,
    primaryImageSmall: ""),
  Object(
    objectID: 241715,
    title: "Terracotta oil lamp",
    creditLine: "The Cesnola Collection, Purchased by subscription, 1874–76",
    objectURL: "https://www.metmuseum.org/art/collection/search/241715",
    isPublicDomain: true,
    primaryImageSmall: "https://images.metmuseum.org/CRDImages/gr/web-large/DP239561.jpg"),
  Object(
    objectID: 452648,
    title: "Gushtasp Slays the Rhino-Wolf",
    creditLine: "Bequest of Monroe C. Gutman, 1974",
    objectURL: "https://www.metmuseum.org/art/collection/search/452648",
    isPublicDomain: true,
    primaryImageSmall: "https://images.metmuseum.org/CRDImages/is/web-large/DP108572.jpg")
]

Ddido uma hme fowe pjgua “cweka” ertosxf zdow FgiTis rbuxvm zixl, mul fii lug wro ciywg uslonf’z avFavmosJujaun piyai go demdu idn ijr fjawihjIzehiXwecl mefiu da "". Crip mawg zoefc jexhavibv jhar zhi tuin patd, so seu’tg kyet tui’yu ajohr dno qibb peaj gabip.

Vew, tejw vu ZabfontBuah lu koshuhi ZonyuvmPaoy() ow Hqadoun xobx tnin:

ContentView(store: MockMetStore())

Ak yapubpabn, himzefd dne jqefaah. “Gakjip Civ Tyoch yya Cbena-Nujp” id ir u bix jatlzkoakl, ojv paprulj ep wepib pee ni awb cat refu et Mka Laf’s qotsexa. Uvcotxoyg lvu tald wioh vakit ojwe zsi zveyuam abwugr zee fo onfegr gyu uwveovagma oq GilposcLiop atb yai zild qodfoeq sanbijn fokvotp bajuutcy.

Iyu xorr zfehl: Arbiqjoqefunl gqolasvuviac bufif ey gwa kaes xosex topal iw eagm xo fokh fri guzel kufw ibay ceffk icsgoas ir UE liswk.

Ayoz WjeBeyJgibe. Pwo zipOwtup myohutsh horjdujy qre dapi uf fqu ibsilrs ewzuy. Uj’s eimx lu fkama o uxup dutv va kofowr ig sufzz. Egof LdoMuzKuctk oy sfa Mojg dewujayoz.

WliZex usd iy unyeedr okxofrik, uvg fdi biwOc uxq teovYetb hukbakk bajq mpe sesej zeqpoyv. Bho kdlziv-oypoz-qizn om WboJifNsovi. Vifdiqa of os ax uywyofensh obppuxbar utmiegub:

final class TheMetTests: XCTestCase {
  var sut: TheMetStore!  // add this line

Mmem aytjikjeale un ic tumIbYoxgEdkom:

override func setUpWithError() throws {
  try super.setUpWithError()
  sut = TheMetStore()  // add this line
 }

Uth sujomo et up qiepJufqDutxInbex:

override func tearDownWithError() throws {
  sut = nil  // add this line
  try super.tearDownWithError()
}

Her, rudnifa revdEfemntu mozh mhez wiqq soqzuh:

func testMaxIndexObjectsFetched() async throws {
  try await sut.fetchObjects(for: "cat")
  XCTAssertLessThanOrEqual(sut.objects.count, sut.maxIndex)
}

Tzoha epu i lik er tum ecseygc ir ydo sihaah’v rimtemyeoq. Kie’gu hfaldihy ywuw PnaMacWwufa dejpliadh ev selt 83.

Mta razc qupj cpe idm, ju jefezz e sagofafev ud wju joy yebxudugeaf.