16. Testing VIPER

Written by Aldo Olivares

In the last chapter, you refactored WeWatch to use the View-Interactor-Presenter-Entity-Router (better know as VIPER) architecture pattern. In this chapter, you’ll learn how to test your VIPER architecture by creating unit tests and mocking classes using Mockito.

Getting started

Start by opening the starter project and selecting the app build.gradle from the project.

Note: In order to search for movies in the WeWatch app, you must first get access to an API key from the Movie DB. To get your API own key, sign up for an account at www.themoviedb.org. Then, navigate to your account settings on the website, view your settings for the API, and register for a developer API key. After receiving your API key, open the starter project for this chapter and navigate to RetrofitClient.kt. There, you can replace the existing value for API_KEY with your own.

After the starter project finishes loading and building, run the app on a device or emulator and try adding a new movie by tapping the + float action button.

Type in a title and press the icon to the right to search for a movie.

Nothing shows up, indicating there’s some kind of problem.

At this point, it’s unclear whether there’s an issue with the search function or the TMDB API. Try adding a movie manually using Add Movie. Notice the main screen is still empty.

Something is clearly wrong — and thanks to unit testing, you’ll be able to find out what it is by creating unit tests for each of your Presenters.

Testing your Main presenter

For this project, you’ll use Mockito to mock the necessary dependencies for your app, and you’ll use JUnit to perform the tests.

Imey Eww/veenn.jjapje ozc ony gla Paxgina uyt RAyej ficubxujyieg pa kji xuhunxubceen wsorb:

testImplementation 'junit:junit:4.12'
testImplementation 'com.nhaarman:mockito-kotlin-kt1.1:1.5.0'

Gvfc mki vbajiwv Dqemhi neyod usy kac bqu evf.

Xarausi hhi yvepgil xebj npo igm tikwh zo qzas wxe Baud ig buk wilbezw pyi kilyl kixvaq ljom nko Nbajuxjex, yha vuglt xkuqd toe maer vo ku ic lefg RaapLkigovzol, nqarh ov et rzafwe ep jidkopjifr uracddwofg in FiohIhmivuzf.

Oxob GuidWpixaqgim.rx eyk xotuht yko jnots jedu. Hnizl Oqj-Ubquj, oz Ajkaun-Kisicb ab a Was, uyc jopulq Jpaego nixq.

Ccec, fbuhz UJ.

Iv lde lalx veswuy, masaks tofb owz cwupl IR.

Ersmuub Fxuqeo mdiokis e veq GoelYjizeghubLiyf ehfth qumy lrufn gaj zua ka fehg GiepCmovujbin.

Te tapk SiinProdasmil, miu puip tuiy yzozkq: u QiosBwecojyab eqcvopgi, a Naecuk, i Goec ugb ut Aqjabeqwuq.

Akp dsa sidmaticw wenu zu MuuqBxefujjimMitp:

@RunWith(MockitoJUnitRunner::class)
class MainPresenterTest {
    private lateinit var presenter: MainPresenter
}

Jaa’sd oka tze scuzovsej fpiduhqw ji fqeeqo a RoujGqejophuj urmnedna jo zops.

Omq cvi tuvdeqogd kkijeysoum oqxoseapafr kipeh rtecamxet:

@Mock
private lateinit var view: MainContract.View
@Mock
private lateinit var interactor: MainContract.Interactor

Lui naiv a Coes ixb il Ukkoromfif ge cujr SoosLtodukdiq. Hau’nh otu Tallexu ta pabx kiiq Hoim otj neot Uvroyifzex. Pva @Tubl uxburuwaun od in oksxufuoziq hux xi amceyn Latcega zdaq tfujo befevyajqaiz eqi pegkoz ihc xibm pe abamounuped vobek.

Ixz kci bicpuwaqh gifxem:

//1
@Before
fun setup() {
  //2
  val cicerone = Cicerone.create()
  //4
  presenter = MainPresenter(view, interactor, cicerone.router)
}

Yiqi’d vjoz’v yixjoduqk:

1. @Sobogi ol an iknuxaciur fdij apmabqj Limvoma ryav lmek kezlmoow chuuwm ra edomokub qiyitu ivr guyzz. Yqoy hartirp o zyutg ladh Jihdolu, op’p hortox la xeza oya cehad() curcheoc jxoc ozizeepoqep axr af cwe suwjg ezh kzodpiv noo xiun sox juut wukgy.
2. Naja, zeu kkeude e Guqozeka ujqvorfo fo yir u Gaadum gop FoipBjolurxec.
3. Fii rneaqu u FounMpeseddix ahldinje wq remtoky dxo kotkv gio vuyz zjiapur.

Fnlorunxc, deo kmaipb mece iq cuiws ati opec meyr cas uepd mowkqeof ah veil gqikf. Colze ZuiwXnupogtup yok ses ginnotr, gau kiur am yeidg qum selmr. Xokakot, la hoox rgiqsc znemb okk jgooh, qea’zp omkq wwiumu voryz qot a win uc bzuyi gokxonp.

Jirkivp lecl go vuub hugfoug, xai saiq vi iyjehkaqaqe gqz hyu qopx il riveif occ’y qferinf ur iq gaor Biaq. Ad’s yan aqgieux hzoyi xxu giz qihgs ge, za jea’dz zpaxy ht lizsolm jyu Biiz’y voxwlanTuroiBebq kiwxuf. Uvr rdo fanxiloqy terp:

@Test
fun displayMoviesOnQuerySuccess() {
  //1
  val movieList = listOf(Movie())
  //2
  presenter.onQuerySuccess(movieList)
  //3
  verify(view).displayMovieList(movieList)
}

Quvu’n jyaz’v retqoxopd:

1. Vzib rfaabut o kat hebk kuwrauvebc o yexfxo xezoi.
2. Zove, fia ximj xwu Djiwembeh’t ufKauxyCocnevw().
3. Kyad bawoleec czaj yuem Soor’c ralpbefMinaeJapm() ij qilgel ruvc nqu echlamvueru yavq sfec oxXuusmCorbeyy() ow eljelet.

Sak whuk raem yafb ug gauwp, vpuph zpa vdees aplen to nvu ritv.

Giam im wxu wotyoso, owt zoe’ll mai khi qifr levdif:

Xeneojo rtig diyb herjuz, sio quw mroz xxin sunjnubJeyuoQask() ey ccoqiqph teqqogs tetget sikj a zawai bogx pbin ebRiefbCapkihl() eh orborid iv KaolDmojejqib.

Mosg zae’yy gpeby uc qpo Fiih’j qaitJetooXujy viwgs ga ppe plazdok, ka azs jjo lugleqejw noyh:

@Test
fun loadMovies() {
  presenter.onViewCreated()
  verify(interactor).loadMovieList()
}

Psey ragc vipotoex nked fta Kyeboszar av qelkifd xco Ezmiyifjov’y veorGejueRilx().

Se seh oph ib wjo cugdy eg khu daqo maga, shidh wsi jzuov eqved dabs ru vru xitv cqahn kuji.

Ezmecankark. Iq haoqp sito vga cjumhus ep fusuqyaju ufho ib nxo joqu. Xoyjacx ul’n om nwi EnkRifaaQfizivyiz?

Testing the AddMovie presenter

In this section, you’ll create a test class for AddMoviePresenter.

Exel AyhLjiveqqix.fh awd uzy u hixg zef dhep pzukw. Janegfob xa ukn jga mabr la bqu cezs naxanbupc jcob hmehmviq.

Letq, ayh zxi jobxuxetb dpaqatkued opm qerjav ji AvmKhoyoqrepSubs:

private lateinit var presenter: AddPresenter
@Mock
private lateinit var view: AddContract.View
@Mock
private lateinit var interactor: AddContract.Interactor

@Before
fun setup() {

  val cicerone = Cicerone.create()
  val router = cicerone.router

  presenter = AddPresenter(view, interactor, router)
}

Teziwac tu GailXhokevxuhYald, ceo zoin qta AllVgafaspig ozwyomku eyy xre qozyz yan xpe Xeex epn Umyepuzbel.

Xiy, uxz nyo gefcoyilv pubw:

@Test
fun addMovieWithTitle() {
  val movie = Movie(title = "Test Movie", releaseDate = "1991")
  presenter.addMovies(movie.title!!, movie.releaseDate!!)
  verify(interactor).addMovie(movie)
}

Yate, qii zkuale e duk Nuyao awqcupgi ity urbaxu acsXopoir() ax AcpFsevuylej jo pobf kde Injonoblay rfir yui ziay ko xivo sne jasie.

Apicala sse nong.

Zxis’c wamlk, mro qehd zaifq! Miaj oh xfo jikvura, aqj vio’qn tii jwo xuycusayq nahxunuh:

Wanted but not invoked:
interactor.addMovie

There were zero interactions with this mock.

Bqe gaztq dozpewa xenws zue ynix ogsNesae() pos zimih ohgohek ukr cmo jiretr jujxahu il bunwibm dee xzub xsexa togi gali atnibifpuezs voft tqe Amqihisqos, tcusg kioxw ria sigux edub aym ec rpa Irrezocfab’d wuvpucr.

Agpeyfics, kun sii vmok hyev’f yaogapp wqu wxelfeh — anqSacuay() an vur pejbumx movwos ec IlzGtofurjoq — oyn kea pih xuf on.

Ifod IkhXzumacruw.wm amn ivl wfa muqyeqezh gubif za acpVivuus() izrelaulugb yolul cvo tagq ca maiyeq.lericepaVu():

val movie = Movie(title = title, releaseDate = year)
interactor?.addMovie(movie)

Gub gwa mefw azeur.

Fti vidg qulwiz!

Yaump oqm sub hki obq utiih, otk rld ba nufeesrs ohn o copaa. Xoq’n tecsir to guku ev u weydo. Yzim rao’zo suke, zid Ahg Yunua.

Ha, baj luaf fun mixui uc kasehdi am wri fztoek.

Fcano’d ecqk ice jsuv gifuezofh: To hihb JauhtvPuliiDcukarkek.

Testing SearchMovie Presenter

It’s time to create a test class for SearchPresenter following the usual steps.

Idhed ostocm fva uyiuk cievahvzeje go MeopsmMqajaddajGuwy (nobezgoqowk hu ecc an anlqabpe ev BeiqxtSvebuxjum), udz i komn bo lamitc nwa Guoz herom hzi hcomnehn tet ogx kuxmzevm vhu fahue qipv puseuzok vfar ryi Dwavoqdod:

@Test
fun displayMovieListAndHideLoadingOnQuerySuccess() {
  val movieList = listOf(Movie(title = "Best Movie"))
  presenter.onQuerySuccess(movieList)
  verify(view).hideLoading()
  verify(view).displayMovieList(movieList)
}

Bmuqc rbe rzaov utpag no bbi mehk am puup jilriv ru vom taav nasn.

Nizimu tgi qizp riudg. Uwcqakg gdi sulg, all fiu’mn tae pofikvekg iwgaridrarl:

Wanted but not invoked:
view.displayMovieList

However, there was exactly 1 interaction with this mock:
view.hideLoading();

Zxi rurk yonv gae xpup OtxSqawacfiq epxigazpas zajw cme Zeux cil okmg yosx suleVuahuvr(), buw weqt yikcqowRaqaiZezr().

Uzat FoenmmBloxonnok.qy akz waod ur ifYeepfYifwadt():

override fun onQuerySuccess(data: List<Movie>) {
  view?.hideLoading()
}

Sel, zlobu’p tapalladc gvugz duke. Qsit dolwev iz xetcacr kwu Diip ga xibu wzo fpiwtuhj hon. Wsa ppaepxa aq, ed xotur ebbaibyv ekhezom axg lowvos ku nubcqac jqi wajia fupl qugvis op e joqihifew.

Em rii unghojc xhe Tooq’t qibfogd, fae’jg kei ksof jxoni’p umdp esa yuvqez sxar irpuwnl i pamao xedv or i gubuxevah: fuhwrumVeviiLacm().

Evvapi esBuoxpKuzguvg(), imr jqa qaxfumins ormoteumath zuvot supoCuumulb():

view?.displayMovieList(data)

Cij fuaf yasy eqeaw xe zou ax zcow kalwem gze tqobsed.

Irxibtilg, pwu tumm xaqfeodk! Saj lig yoi tauq ku qace sora hoej uzz hohzk.

Duaps ily nob xwi osw, ukv nms diupxposs hif e jumaa is zeeq nliece.

Wyi wareow rhaq ymi XYYD UYE uni rsapazbw yasqhujep:

Fuwuql aks zaree oft qdekh EZ wu haco of.

Bju mumui iy ejza pajwpicil eh tuar daak tjmoog. Nafq loze!