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Welcome to Android World! 

Application is growing 

Application is growing 

Categories of Android tests Run on the JVM (local tests) Require Android device (instrumentation tests) Tests 

How to test the project? 

Unit tests JUnit Hamcrest Mockito Robolectric 

Integration tests JUnit Hamcrest Mockito Instrumentation API 

Acceptance tests Espresso UiAutomator Robotium Calabash Appium 

Android Testing Support Library AndroidJUnitRunner JUnit4 Rules Espresso UiAutomator 

adb shell Instrumentation am instrument Application Test Application 

AndroidJUnitRunner ü JUnit4 support ü Collect tests ü Execute tests ü Report results 

JUnit4 Rules ü ActivityTestRule ü IntentsTestRule ü ServiceTestRule ü ProviderTestRule ü GrantPermissionRule (API 23 – Android Marshmallow) 

GrantPermissionRule ü grant(varargs permissions : String!) @Rule @JvmField val permissionRule = GrantPermissionRule.grant( android.Manifest.permission.ACCESS_FINE_LOCATION, android.Manifest.permission.WRITE_EXTERNAL_STORAGE ) 

Test rule order class MultipleRulesTest { @Rule @JvmField val firstLog = LogRule("First") @Rule @JvmField val secondLog = LogRule("Second") @Test fun test() { assertEquals(1, 1) } } 

Test rule order class MultipleRulesTest { @Rule @JvmField val firstLog = LogRule("First") @Rule @JvmField val secondLog = LogRule("Second") @Test fun test() { assertEquals(1, 1) } } Second - Start First - Start Running the test First - End Second - End 

Test rule order class MultipleRulesTest { @Rule @JvmField val firstLog = LogRule("First") @Rule @JvmField val secondLog = LogRule("Second") @Test fun test() { assertEquals(1, 1) } } JVM Second - Start First - Start Running the test First - End Second - End 

Control the rule order class MultipleRulesTest { @Rule @JvmField val mChain = RuleChain.outerRule(LogRule("First")) .around(LogRule("Second")) @Test fun test() { assertEquals(1, 1) } } First - Start Second - Start Running the test Second - End First - End 

val mTempFolderRule = TemporaryFolder(getContext().cacheDir) val mPermissionRule = GrantPermissionRule.grant( Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE) @Rule @JvmField val mChain = RuleChain.outerRule(mPermissionRule) .around(mTempFolderRule) 

Custom rule class LogRule(text: String): TestRule { val logText = text override fun apply(base: Statement, description: Description): Statement { return object : Statement() { override fun evaluate() { println("$logText - Start") base.evaluate() println("$logText - End") } } } } 

Espresso Android 2.2 (API 8) Turn off the animations 

Espresso onView(ViewMatcher) .perform(ViewAction) .check(ViewAssertion) 

onView(withId(R.id.name)) .perform(typeText("Alex")) onView(withId(R.id.pay)) .check(matches(isDisplayed())) .perform(click()) 

onView(withId(R.id.name)) .perform(typeText("Alex")) onView(withId(R.id.pay)) .check(matches(isDisplayed())) .perform(click()) 

Hamcrest matchers 

onView(withId(R.id.payment)) .check(matches( `is` withText(startsWith("Go")))) endsWith 

@RunWith(AndroidJUnit4::class) class LoginActivityTest { @Rule @JvmField val mLoginActivityRule = ActivityTestRule(LoginActivity::class.java) @Test fun shouldVerifyEmptyPassword() { onView(withId(R.id.edit_text_email)) .perform(typeText("Alex"), closeSoftKeyboard()) onView(withId(R.id.login_button)) .perform(click()) onView(withId(R.id.password_text_layout)) .check(matches(withError(`is`("Please enter a password")))) } } 

@RunWith(AndroidJUnit4::class) class LoginActivityTest { @Rule @JvmField val mLoginActivityRule = ActivityTestRule(LoginActivity::class.java) @Test fun shouldVerifyEmptyPassword() { onView(withId(R.id.edit_text_email)) .perform(typeText("Alex"), closeSoftKeyboard()) onView(withId(R.id.login_button)) .perform(click()) onView(withId(R.id.password_text_layout)) .check(matches(withError(`is`("Please enter a password")))) } } 

@RunWith(AndroidJUnit4::class) class LoginActivityTest { @Rule @JvmField val mLoginActivityRule = ActivityTestRule(LoginActivity::class.java) @Test fun shouldVerifyEmptyPassword() { onView(withId(R.id.edit_text_email)) .perform(typeText("Alex"), closeSoftKeyboard()) onView(withId(R.id.login_button)) .perform(click()) onView(withId(R.id.password_text_layout)) .check(matches(withError(`is`("Please enter a password")))) } } * withError – a custom matcher 

fun withError(expected: Matcher): Matcher { return object : TypeSafeMatcher() { override fun matchesSafely(item: View): Boolean { return if (item is TextInputLayout) { expected.matches(item.error.toString()) } else false } override fun describeTo(description: Description) { description.appendText("with error message: ") description.appendText(expected.toString()) } } } 

onView(withId(R.id.download)) .perform(click()) onView(withId(android.support.design.R.id.snackbar_text)) .check(matches( withText(R.string.downloading_movie_info))) 

What is an AdapterView and how it works? java.lang.Object ↳ android.view.View ↳ android.view.ViewGroup ↳ android.widget.AdapterView GridView ListView Spinner 

Espresso onData(ObjectMatcher) .DataOptions .perform(ViewAction) .check(ViewAssertion) 

onData – ArrayAdapter onData(allOf(`is`(instanceOf(String::class.java)), `is`("Americano"))) .check(matches(isDisplayed())) val arrayAdapter = ArrayAdapter( this@DetailActivity, android.R.layout.simple_list_item_1, android.R.id.text1, coffeeList) 

onData – custom adapter @Test fun clickCoffeeItem() { ... onData(withCoffee(espresso)) .inAdapterView(withId(R.id.detail_list)) .perform(click()); } class CoffeeAdapter : BaseAdapter() { ... override fun getItem(position: Int): Any { return mOrderedCoffee.keys.toTypedArray()[position] } } 

fun withCoffee(expected: Coffee) : Matcher { return object : BoundedMatcher(Coffee::class.java) { override fun describeTo(description: Description) { description.appendText("has value: $expected") } override fun matchesSafely(item: Coffee): Boolean { return item == expected } } } 

RecyclerView java.lang.Object ↳ android.view.View ↳ android.view.ViewGroup ↳ android.support.v7.widget.RecyclerView It is not an AdapterView 

RecyclerViewActions ü actionOnHolderItem ü actionOnItem ü actionOnItemAtPosition ü scrollTo ü scrollToHolder ü scrollToPosition onView(withId(R.id.recyclerView)) .perform(actionOnItemAtPosition(3, click())) App data: https://www.themoviedb.org 

ü Message Queue ü AsyncTask ü Idling Resources Espresso synchronization 

IdlingResource class ServiceIdlingResource : IdlingResource { lateinit var mResourceCallback : ResourceCallback override fun getName(): String { return ServiceIdlingResource::class.simpleName!! } override fun isIdleNow(): Boolean { val isIdle = !isIntentServiceRunning() if (isIdle) { mResourceCallback.onTransitionToIdle() } return isIdle } override fun registerIdleTransitionCallback(callback: ResourceCallback) { mResourceCallback = callback } fun isIntentServiceRunning() : Boolean { ... } } http://blog.sqisland.com/2015/04/espresso-custom-idling-resource.html 

Using IdlingResource @Before fun setUp() { mLoadingIdlingResource = ServiceIdlingResource() IdlingRegistry.getInstance().register(mLoadingIdlingResource) } @Test fun shouldVerifyMessageDuringDownloading () { onView(withId(R.id.fab)) .perform(click()) onView(withId(android.support.design.R.id.snackbar_text)) .check(matches(withText(R.string.downloading_movie_info))) } @After fun tearDown() { IdlingRegistry.getInstance().unregister(mLoadingIdlingResource) } 

CountingIdlingResource class MovieDetailActivity : AppCompatActivity() { val mCountingIdlingResource = CountingIdlingResource(LOADING_MOVIE_DETAILS) companion object { private const val LOADING_MOVIE_DETAILS = "loading_movie_details" } fun loadMore() { mCountingIdlingResource.increment() ... } fun showMovies() { ... mCountingIdlingResource.decrement() } } 

Using CountingIdlingResource @Before fun setUp() { var mLoadingIdlingResource = mMovieDetailActivityRule .activity.mCountingIdlingResource IdlingRegistry.getInstance().register(mLoadingIdlingResource) } @Test fun shouldVerifyMessageDuringDownloading () { onView(withId(R.id.fab)) .perform(click()) onView(withId(android.support.design.R.id.snackbar_text)) .check(matches(withText(R.string.downloading_movie_info))) } @After fun tearDown() { IdlingRegistry.getInstance().unregister(mLoadingIdlingResource) } 

Configure a custom intent @Rule @JvmField val mMovieDetailActivityRule = ActivityTestRule( MovieDetailActivity::class.java, true, false) // is activity launch? @Test fun shouldDisplayMessageDuringDownloading() { val context = InstrumentationRegistry.getTargetContext() val movieIntent = Intent(context, MovieDetailActivity::class.java) movieIntent.putExtra("movie_id", ANNABELLE_MOVIE) mMovieDetailActivityRule.launchActivity(movieIntent) ... } App data: https://www.themoviedb.org 

Handle animation inside the app val animatorSpeed = Settings.Global.getFloat(​ contentResolver,​ SETTINGS_NAME,​ 0.0f)​ ​ ü Settings.Global.ANIMATOR_DURATION_SCALE ​ ü Settings.Global.TRANSITION_ANIMATION_SCALE​ ü Settings.Global.WINDOW_ANIMATION_SCALE​ 

UI AutomatorViewer Android Studio Tools / Android / Android Device Monitor Application {ANDROID_SDK} / tools / uiautomatorviewer 

UiAutomator Android 4.3 (API 18) Interacting with any applications Interacting with a system 

Test of calculator application class CalculatorAppTest { lateinit var mDevice: UiDevice @Before fun setUp() { mDevice = UiDevice.getInstance(InstrumentationRegistry.getInstrumentation()) mDevice.pressHome() mDevice.findObject(By.desc("Apps list")).click() mDevice.findObject(By.desc("Calculator")).click() } @Test fun shouldSumThreeAndFive() { mDevice.wait(Until.hasObject(By.text("5")), 3_000L) val five = mDevice.findObject(By.text("5")) val plus = mDevice.findObject(By.text("+")) val three = mDevice.findObject(By.text("3")) val equal = mDevice.findObject(By.text("=")) five.click() plus.click() three.click() equal.click() val result = mDevice.findObject(By.res("com.android.calculator2", "result")) assertEquals("8", result.text) } @After fun tearDown() { mDevice.pressBack() } } 

Test of calculator application class CalculatorAppTest { lateinit var mDevice: UiDevice @Before fun setUp() { mDevice = UiDevice.getInstance(InstrumentationRegistry.getInstrumentation()) mDevice.pressHome() mDevice.findObject(By.desc("Apps list")).click() mDevice.findObject(By.desc("Calculator")).click() } @Test fun shouldSumThreeAndFive() { mDevice.wait(Until.hasObject(By.text("5")), 3_000L) val five = mDevice.findObject(By.text("5")) val plus = mDevice.findObject(By.text("+")) val three = mDevice.findObject(By.text("3")) val equal = mDevice.findObject(By.text("=")) five.click() plus.click() three.click() equal.click() val result = mDevice.findObject(By.res("com.android.calculator2", "result")) assertEquals("8", result.text) } @After fun tearDown() { mDevice.pressBack() } } 

Test of calculator application class CalculatorAppTest { lateinit var mDevice: UiDevice @Before fun setUp() { mDevice = UiDevice.getInstance(InstrumentationRegistry.getInstrumentation()) mDevice.pressHome() mDevice.findObject(By.desc("Apps list")).click() mDevice.findObject(By.desc("Calculator")).click() } @Test fun shouldSumThreeAndFive() { mDevice.wait(Until.hasObject(By.text("5")), 3_000L) val five = mDevice.findObject(By.text("5")) val plus = mDevice.findObject(By.text("+")) val three = mDevice.findObject(By.text("3")) val equal = mDevice.findObject(By.text("=")) five.click() plus.click() three.click() equal.click() val result = mDevice.findObject(By.res("com.android.calculator2", "result")) assertEquals("8", result.text) } @After fun tearDown() { mDevice.pressBack() } } 

Test of calculator application class CalculatorAppTest { lateinit var mDevice: UiDevice @Before fun setUp() { mDevice = UiDevice.getInstance(InstrumentationRegistry.getInstrumentation()) mDevice.pressHome() mDevice.findObject(By.desc("Apps list")).click() mDevice.findObject(By.desc("Calculator")).click() } @Test fun shouldSumThreeAndFive() { mDevice.wait(Until.hasObject(By.text("5")), 3_000L) val five = mDevice.findObject(By.text("5")) val plus = mDevice.findObject(By.text("+")) val three = mDevice.findObject(By.text("3")) val equal = mDevice.findObject(By.text("=")) five.click() plus.click() three.click() equal.click() val result = mDevice.findObject(By.res("com.android.calculator2", "result")) assertEquals("8", result.text) } @After fun tearDown() { mDevice.pressBack() } } 

Test of calculator application class CalculatorAppTest { lateinit var mDevice: UiDevice @Before fun setUp() { mDevice = UiDevice.getInstance(InstrumentationRegistry.getInstrumentation()) mDevice.pressHome() mDevice.findObject(By.desc("Apps list")).click() mDevice.findObject(By.desc("Calculator")).click() } @Test fun shouldSumThreeAndFive() { mDevice.wait(Until.hasObject(By.text("5")), 3_000L) val five = mDevice.findObject(By.text("5")) val plus = mDevice.findObject(By.text("+")) val three = mDevice.findObject(By.text("3")) val equal = mDevice.findObject(By.text("=")) five.click() plus.click() three.click() equal.click() val result = mDevice.findObject(By.res("com.android.calculator2", "result")) assertEquals("8", result.text) } @After fun tearDown() { mDevice.pressBack() } } 

Test of calculator application class CalculatorAppTest { lateinit var mDevice: UiDevice @Before fun setUp() { mDevice = UiDevice.getInstance(InstrumentationRegistry.getInstrumentation()) mDevice.pressHome() mDevice.findObject(By.desc("Apps list")).click() mDevice.findObject(By.desc("Calculator")).click() } @Test fun shouldSumThreeAndFive() { mDevice.wait(Until.hasObject(By.text("5")), 3_000L) val five = mDevice.findObject(By.text("5")) val plus = mDevice.findObject(By.text("+")) val three = mDevice.findObject(By.text("3")) val equal = mDevice.findObject(By.text("=")) five.click() plus.click() three.click() equal.click() val result = mDevice.findObject(By.res("com.android.calculator2", "result")) assertEquals("8", result.text) } @After fun tearDown() { mDevice.pressBack() } } 

Test of calculator application class CalculatorAppTest { lateinit var mDevice: UiDevice @Before fun setUp() { mDevice = UiDevice.getInstance(InstrumentationRegistry.getInstrumentation()) mDevice.pressHome() mDevice.findObject(By.desc("Apps list")).click() mDevice.findObject(By.desc("Calculator")).click() } @Test fun shouldSumThreeAndFive() { mDevice.wait(Until.hasObject(By.text("5")), 3_000L) val five = mDevice.findObject(By.text("5")) val plus = mDevice.findObject(By.text("+")) val three = mDevice.findObject(By.text("3")) val equal = mDevice.findObject(By.text("=")) five.click() plus.click() three.click() equal.click() val result = mDevice.findObject(By.res("com.android.calculator2", "result")) assertEquals("8", result.text) } @After fun tearDown() { mDevice.pressBack() } } 

Test of calculator application class CalculatorAppTest { lateinit var mDevice: UiDevice @Before fun setUp() { mDevice = UiDevice.getInstance(InstrumentationRegistry.getInstrumentation()) mDevice.pressHome() mDevice.findObject(By.desc("Apps list")).click() mDevice.findObject(By.desc("Calculator")).click() } @Test fun shouldSumThreeAndFive() { mDevice.wait(Until.hasObject(By.text("5")), 3_000L) val five = mDevice.findObject(By.text("5")) val plus = mDevice.findObject(By.text("+")) val three = mDevice.findObject(By.text("3")) val equal = mDevice.findObject(By.text("=")) five.click() plus.click() three.click() equal.click() val result = mDevice.findObject(By.res("com.android.calculator2", "result")) assertEquals("8", result.text) } @After fun tearDown() { mDevice.pressBack() } } 

Espresso + UiAutomator Interacting with a system Better interaction with the app 

@RunWith(AndroidJUnit4::class.java) class FullOrderTest { ... @Test fun shouldOrderThreeEspressos() { ... onView(withId(R.id.pay)).perform(click()) mDevice.openNotification() mDevice.wait(Until.hasObject( By.text(NOTIFICATION_TITLE)), TIMEOUT) val title = mDevice.findObject( By.text(NOTIFICATION_TITLE)) assertEquals(NOTIFICATION_TITLE, title.getText()) ... } } 

@RunWith(AndroidJUnit4::class.java) class FullOrderTest { ... @Test fun shouldOrderThreeEspressos() { ... onView(withId(R.id.pay)).perform(click()) mDevice.openNotification() mDevice.wait(Until.hasObject( By.text(NOTIFICATION_TITLE)), TIMEOUT) val title = mDevice.findObject( By.text(NOTIFICATION_TITLE)) assertEquals(NOTIFICATION_TITLE, title.getText()) ... } } 

Q & A 1. Testing Support library https://developer.android.com/topic/libraries/testing-support-library/ 2. Android Testing Codelab https://codelabs.developers.google.com/codelabs/android-testing/ 3. Espresso https://developer.android.com/training/testing/espresso/ 4. UiAutomator https://developer.android.com/training/testing/ui-automator.html 5. Blog http://alexzh.com/ @Alex_Zhukovich