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ROBOTS ESPRESSO AND 

ESPRESSO 

VIEWINTERACTION interface ViewInteraction { fun check(viewAssertion: ViewAssertion): ViewInteraction fun perform(vararg viewActions: ViewAction): ViewInteraction fun inRoot(rootMatcher: Matcher): ViewInteraction fun noActivity(): ViewInteraction fun withFailureHandler(failureHandler: FailureHandler): ViewInteraction } 

VIEWINTERACTION interface ViewInteraction { fun check(viewAssertion: ViewAssertion): ViewInteraction fun perform(vararg viewActions: ViewAction): ViewInteraction fun inRoot(rootMatcher: Matcher): ViewInteraction fun noActivity(): ViewInteraction fun withFailureHandler(failureHandler: FailureHandler): ViewInteraction } 

VIEWINTERACTION interface ViewInteraction { fun check(viewAssertion: ViewAssertion): ViewInteraction fun perform(vararg viewActions: ViewAction): ViewInteraction fun inRoot(rootMatcher: Matcher): ViewInteraction fun noActivity(): ViewInteraction fun withFailureHandler(failureHandler: FailureHandler): ViewInteraction } 

VIEWINTERACTION @Test fun myTest() { val interaction: ViewInteraction = Espresso.onView(myView) } 

VIEWINTERACTION @Test fun myTest() { val interaction: ViewInteraction = Espresso.onView(myView) .check(…) } 

VIEWINTERACTION @Test fun myTest() { val interaction: ViewInteraction = Espresso.onView(myView) .check(…) .perform(…) .check(…) } 

TWO MOVES OF ESPRESSO ▸ ViewActions ▸ perform(), type(), click() 

TWO MOVES OF ESPRESSO ▸ ViewActions ▸ perform(), type(), click() ▸ ViewAssertions ▸ isDisplayed(), isSelected(), isEnabled() 

TWO MOVES OF ESPRESSO @Test fun emailField_displaysWhatIsTyped() { Espresso.onView(withId(R.id.email)) .check(isDisplayed()) .perform(typeText(“[email protected]")) .check(matches(withText("[email protected]"))) } 

VIEW ASSERTIONS @Test fun emailField_displaysWhatIsTyped() { Espresso.onView(withId(R.id.email)) .check(isDisplayed()) .perform(typeText(“person@email")) .check(matches(withText("[email protected]"))) } 

VIEW ACTIONS @Test fun emailField_displaysWhatIsTyped() { Espresso.onView(withId(R.id.email)) .check(isDisplayed()) .perform(typeText(“[email protected]")) .check(matches(withText("[email protected]"))) } 

ESPRESSO IS BITTER 

ESPRESSO NEEDS SUGAR 

ESPRESSO NEEDS INFIX 

ESPRESSO NEEDS INFIX 

EspressoTest.kt interface EspressoTest { val click: ViewAction get() = ViewActions.click() val visible: ViewMatcher get() = ViewMatchers.isDisplayed() infix fun type(text: String): ViewAction = ViewActions.typeText(text) infix fun Int.shouldBe(viewMatcher: ViewMatcher): ViewInteraction = Espresso.onView(ViewMatchers.withId(this)) .check(ViewAssertions.matches(viewMatcher)) infix fun Int.shouldHaveText(text: String): ViewInteraction = Espresso.onView(ViewMatchers.withId(this)) .check(ViewAssertions.matches(withText(text))) } 

PRE-INFIX @Test fun emailField_displaysWhatIsTyped() { Espresso.onView(withId(R.id.email)) .check(isDisplayed()) .perform(typeText(“[email protected]")) .check(matches(withText("[email protected]"))) } 

@Test fun emailField_displaysWhatIsTyped() { R.id.email shouldBe displayed click on R.id.email type("[email protected]") in R.id.email R.id.email shouldHaveText “[email protected]" } INFIX 

@Test fun emailField_displaysWhatIsTyped() { R.id.email shouldBe displayed click on R.id.email type("[email protected]") in R.id.email R.id.email shouldHaveText “[email protected]" } INFIX 

@Test fun emailField_displaysWhatIsTyped() { click on R.id.email type("[email protected]") in R.id.email R.id.email shouldHaveText “person@email" } INFIX 

ROBOTS 

MODEL VIEWMODEL VIEW APPLICATION ARCHITECTURE 

MODEL VIEWMODEL VIEW TEST ARCHITECTURE TESTS + VIEW ACCESS 

MODEL VIEWMODEL VIEW TESTS TEST ARCHITECTURE VIEW ACCESS 

Robot.kt abstract class Robot { @get:LayoutRes protected abstract val layout: Int fun setFailureHandler(context: Context) { Espresso.setFailureHandler { error, viewMatcher !-> takeScreenshot("test_failed") DefaultFailureHandler(context).handle(error, viewMatcher) } } fun takeScreenshot(description: String) { Timber.v("click click! "-- $description") } } 

abstract class Robot { @get:LayoutRes protected abstract val layout: Int fun setFailureHandler(context: Context) { Espresso.setFailureHandler { error, viewMatcher !-> takeScreenshot("test_failed") DefaultFailureHandler(context).handle(error, viewMatcher) } } fun takeScreenshot(description: String) { Timber.v("click click! "-- $description") } } Robot.kt 

abstract class Robot { @get:LayoutRes protected abstract val layout: Int fun setFailureHandler(context: Context) { Espresso.setFailureHandler { error, viewMatcher !-> takeScreenshot("test_failed") DefaultFailureHandler(context).handle(error, viewMatcher) } } fun takeScreenshot(description: String) { Timber.v("click click! "-- $description") } } Robot.kt 

abstract class Robot { @get:LayoutRes protected abstract val layout: Int fun setFailureHandler(context: Context) { Espresso.setFailureHandler { error, viewMatcher !-> takeScreenshot("test_failed") DefaultFailureHandler(context).handle(error, viewMatcher) } } fun takeScreenshot(description: String) { Timber.v("click click! "-- $description") } } Robot.kt 

LogInRobot.kt class LogInRobot : Robot(), EspressoTest { override val layout: Int = R.layout.activity_login object Ids { const val USERNAME = R.id.etUsername const val PASSWORD = R.id.etPassword const val SHOW_PASSWORD = R.id.btnShowPassword const val SIGN_IN = R.id.btnSignIn const val EULA = R.id.btnEula } … } 

LogInRobot.kt class LogInRobot : Robot(), EspressoTest { fun typeUsername(userName: String = USERNAME) { click on Ids.USERNAME type(userName) on Ids.USERNAME Espresso.closeSoftKeyboard() takeScreenshot("type username $userName") } fun verifyUserName(userName: String) { Ids.USERNAME shouldHaveText userName takeScreenshot(“compare username $userName") } } 

LogInRobot.kt fun EspressoTest.logIn(func: LogInRobot.() "-> Unit): LogInRobot = LogInRobot().apply { func() } 

LogInActivityTest.kt fun EspressoTest.logIn(func: LogInRobot.() "-> Unit): LogInRobot = LogInRobot().apply { func() } @Test fun emailField_displaysWhatIsTyped() { logIn { typeUsername("[email protected]") verifyUserName("[email protected]") } } 

LogInActivityTest.kt @Test fun demoThings() = runBlocking { landing { "//""... } logIn { typeUsername("[email protected]") typePassword("Start123") verifyUsername("[email protected]") clickSignIn() } }