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Espressing yourself
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Rui Gonçalo
May 30, 2017
Programming
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Espressing yourself
Some hints on how to use dagger and mockito to easily build espresso tests.
Rui Gonçalo
May 30, 2017
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Transcript
espressing yourself @rmgoncalo Rui Gonçalo
Use Espresso to write concise, beautiful, and reliable Android UI
tests
Use Espresso to write concise, beautiful, and reliable Android UI
tests
Use Espresso to write concise, beautiful, and reliable Android UI
tests
MainActivity.kt class MainActivity : AppCompatActivity()
class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) } } MainActivity.kt
class MainActivity : AppCompatActivity() { @Inject lateinit var presenter: MainPresenter
override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) } } MainActivity.kt Dagger
MainPresenter.kt class MainPresenter @Inject constructor( private val servicesManager: ServicesManager, private
val getDataUseCase: GetDataUseCase) { private lateinit var view: MainPresenter.View fun attachView(view: MainPresenter.View) { this.view = view } ... interface View { ... } } Dagger
AppComponent.kt @Singleton @Component(modules = arrayOf(AppModule::class)) interface AppComponent { fun plus(module:
ActivityModule): ActivityComponent fun servicesManager(): ServicesManager } Dagger
AppComponent.kt @Singleton @Component(modules = arrayOf(AppModule::class)) interface AppComponent { fun plus(module:
ActivityModule): ActivityComponent fun servicesManager(): ServicesManager } Dagger AppComp AppModule
ActivityComponent.kt @Subcomponent(modules = arrayOf(ActivityModule::class)) interface ActivityComponent { fun plus(module: MainModule):
MainComponent } Dagger AppComp AppModule ActivityComp ActivityModule
MainComponent.kt @Subcomponent(modules = arrayOf(MainModule::class)) interface MainComponent { fun inject(activity: MainActivity)
} Dagger AppComp AppModule ActivityComp ActivityModule MainComp MainModule
MainModule.kt @Module open class MainModule { open fun provideGetDataUseCase() :
GetDataUseCase { return GetDataUseCase } Dagger AppComp AppModule ActivityComp ActivityModule MainComp MainModule
Dagger AppComp AppModule ActivityComp ActivityModule MainComp MainModule class MainActivity :
AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) (application as App) .appComponent .plus(ActivityModule(this)) .plus(MainModule()) .inject(this) } } MainActivity.kt
MainPresenter.kt class MainPresenter @Inject constructor( private val servicesManager: ServicesManager, private
val getDataUseCase: GetDataUseCase) { fun attachView(view: MainPresenter.View) { this.view = view } fun start() { } fun stop() { } }
MainPresenter.kt class MainPresenter (getDataUseCase) { private val subscriptions by lazy
{ CompositeSubscription() } fun start() { subscriptions.add( getDataUseCase.build() .subscribeOn(...) .observeOn(AndroidSchedulers.mainThread()) .subscribe( {result -> view.showResult(result)} , {error -> view.showError(error)}) ) } fun stop() { subscriptions.clear() } }
MainActivity.kt class MainActivity : AppCompatActivity(), MainPresenter.View { @Inject lateinit var
presenter: MainPresenter override fun onStart(){ super.onStart() presenter.start() } override fun onStop(){ super.onStop() presenter.stop() } override fun showResult(result) override fun showError(error) }
MainActivity.kt class MainActivity : AppCompatActivity(), MainPresenter.View { override fun showResult(result)
{ // update layout } override fun showError(error) // update layout }
MainActivityTest.kt @RunWith(AndroidJUnit4::class) @LargeTest class MainActivityTest { @Rule @JvmField val mainActivityTestRule
= ActivityTestRule<MainActivity>(MainActivity::class.java) @Test fun something() { // test } }
AppComp AppModule ActivityComp ActivityModule MainComp MainModule /src/main/java/com/example/ /src/androidTest/java/com/example/ AppComp AppModuleMock
ActivityComp ActivityModuleMock MainComp MainModuleMock
MainActivityTest.kt @RunWith(AndroidJUnit4::class) @LargeTest class MainActivityTest { @Rule @JvmField val mainActivityTestRule
= ActivityTestRule<MainActivity>(MainActivity::class.java) @Test fun something() { // test } } https://github.com/fabioCollini/DaggerMock
MainActivityTest.kt @RunWith(AndroidJUnit4::class) @LargeTest class MainActivityTest { val app = InstrumentationRegistry.getInstrumentation()
.targetContext .applicationContext as App @Rule @JvmField val appComponentRule = DaggerMockRule(AppComponent::class.java, AppModule(app)). set { component -> app.appComponent = component } @Mock lateinit var getDataUseCase: GetDataUseCase @Mock lateinit var servicesManager: ServicesManager } https://github.com/fabioCollini/DaggerMock
MainActivityTest.kt @RunWith(AndroidJUnit4::class) @LargeTest class MainActivityTest { @Mock lateinit var getDataUseCase:
GetDataUseCase @Test fun something() { `when`(getDataUseCase.build()).thenReturn(Observable.just(result)) // test } } https://github.com/fabioCollini/DaggerMock
MainActivityTest.kt @RunWith(AndroidJUnit4::class) @LargeTest class MainActivityTest { @Rule @JvmField val mainActivityTestRule
= ActivityTestRule<MainActivity>(MainActivity::class.java, false, false) @Test fun something() { `when`(getDataUseCase.build()).thenReturn(Observable.just(result)) mainActivityTestRule.launchActivity() // test } } launchActivity
onView(Matcher).perform(ViewAction) onView(Matcher).check(ViewAssertion)
MainActivityTest.kt @RunWith(AndroidJUnit4::class) @LargeTest class MainActivityTest { @Test fun something() {
`when`(getDataUseCase.build()).thenReturn(Observable.just(result)) mainActivityTestRule.launchActivity() onView(withId(R.id.text)).check(matches(withText("result"))) } }
MainActivityTest.kt @RunWith(AndroidJUnit4::class) @LargeTest class MainActivityTest { @Test fun something() {
`when`(getDataUseCase.build()).thenReturn(Observable.just(result)) mainActivityTestRule.launchActivity() onView(withId(R.id.text)).check(matches(withText("result"))) } } http://jakewharton.com/testing-robots
MainActivityTest.kt @RunWith(AndroidJUnit4::class) @LargeTest class MainActivityTest { val mainActions = MainActivityActions()
val mainAssertions = MainActivityAssertions() @Test fun something() { `when`(getDataUseCase.build()).thenReturn(Observable.just(result)) mainActivityTestRule.launchActivity() mainAssertions.isDisplayingResult() } } http://jakewharton.com/testing-robots
Hole19 Android Wear 2.0 app
Hole19 Android Wear 2.0 app
RoundActions.kt class RoundActions { fun onRound(func: RoundActions.() -> Unit) =
RoundActions().apply { func() } fun openDrawer() { onView(withId(R.id.peekView)).perform(click()) } fun selectDistanceUnit(unit: DistanceUnit) { if (unit == DistanceUnit.METRIC) { onView(withId(R.id.metric)).perform(click()) } else { onView(withId(R.id.imperial)).perform(click()) } }
RoundAssertions.kt class RoundAssertions { fun isDrawerOpen() { onView(withId(R.id.drawerContent)).check(matches(isCompletelyDisplayed())) } fun
isDisplayingMetricLabel() { onView(allOf(withId(R.id.distanceUnitLabel), isCompletelyDisplayed())) .check(matches(withText("m"))) } }
RoundActivityTest.kt class RoundActivityTest { @Test fun changeDistanceUnitsToMetric() { `when`(getDistanceUnitsUseCase.build()) .thenReturn(Observable.just(DistanceUnit.IMPERIAL))
roundActivityTestRule.launchActivity() roundActions.onRound { openDrawer() openDistanceUnits() selectDistanceUnit(DistanceUnit.METRIC) } roundAssertions.isDisplayingMetricLabel() }
None
Automatic UI testing spares manual QA tasks Make sure *nothing*
breaks on refactoring Test on a set of emulators/real devices Test on different locales
Thank you @rmgoncalo