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TAKING CARE OF YOUR UI TESTS

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ESPRESSO

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Maintainable Extendable Readable Stable

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@florianmski

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PAGEOBJECT

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What? Wraps screen with an application-specific API Allow interacting with screen elements easily Test code not affected by UI changes

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Why? Test code easier to understand Logic is about the intention of the test Don’t care about UI details

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No content

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onView(withId(R.id.track_detail_actions_more)) .perform(click()); onView(withId(R.id.bottom_options_recycler_view)) .perform(actionOnItem(hasDescendant(allOf( withId(R.id.bottom_options_item_title), withText(R.string.track_detail_action_private))), click())); onView(withId(android.R.id.button1)).perform(click());

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onView(withId(R.id.track_detail_actions_more)) .perform(click()); onView(withId(R.id.bottom_options_recycler_view)) .perform(actionOnItem(hasDescendant(allOf( withId(R.id.bottom_options_item_title), withText(R.string.track_detail_action_private))), click())); onView(withId(android.R.id.button1)).perform(click());

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onView(withId(R.id.track_detail_actions_more)) .perform(click()); onView(withId(R.id.bottom_options_recycler_view)) .perform(actionOnItem(hasDescendant(allOf( withId(R.id.bottom_options_item_title), withText(R.string.track_detail_action_private))), click())); onView(withId(android.R.id.button1)).perform(click());

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trackDetailScreen.showTrackOptions() .tapOnMakeTrackPrivateOption() .tapOnConfirmInDialog();

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SCREENS, INTERACTORS & ASSERTIONS

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Screens public class TrackDetailScreen extends Screen {
 
 private final TrackDetailInteractors interactors;
 
 public TrackDetailScreen() {
 super(R.id.track_detail_container);
 interactors = new TrackDetailInteractors();
 }
 
 public Options showTrackOptions() {
 interactors.trackActions().perform(click());
 return goTo(new Options());
 } }

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And part of screens… public static class Options extends BottomSheetScreen {
 
 public DialogScreen tapOnMakeTrackPrivateOption() {
 return tapOnOptionWithString(R.string.track_detail_action_private).goTo(dialog());
 }
 
 public DialogScreen tapOnMakeTrackPublicOption() {
 return tapOnOptionWithString(R.string.track_detail_action_public).goTo(dialog());
 }
 
 public UnknownScreen tapOnPlayTrackOption() {
 return tapOnOptionWithString(R.string.track_detail_action_play) .goTo(new UnknownScreen());
 }
 
 }

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And part of screens… public static class Options extends BottomSheetScreen {
 
 public DialogScreen tapOnMakeTrackPrivateOption() {
 return tapOnOptionWithString(R.string.track_detail_action_private).goTo(dialog());
 }
 
 public DialogScreen tapOnMakeTrackPublicOption() {
 return tapOnOptionWithString(R.string.track_detail_action_public).goTo(dialog());
 }
 
 public UnknownScreen tapOnPlayTrackOption() {
 return tapOnOptionWithString(R.string.track_detail_action_play) .goTo(new UnknownScreen());
 }
 
 }

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As well as dialogs… public class DialogScreen extends Screen {
 
 public Screen tapOnConfirmInDialog() {
 return tapOnButton(android.R.id.button1);
 }
 
 public Screen tapOnCancelInDialog() {
 return tapOnButton(android.R.id.button2);
 }
 
 protected Screen tapOnButton(@IdRes int buttonId) {
 onView(withId(buttonId)).perform(click());
 return previousScreen();
 }
 
 }

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Interactors public class TrackDetailInteractors {
 
 BetterViewInteraction trackActions() {
 return BetterViewInteraction.wrap(onView(withId(R.id.track_detail_actions_more)));
 }
 
 BetterViewInteraction privateIndicator() {
 return BetterViewInteraction.wrap(onView(withText(R.string.track_item_private)));
 }
 
 RecyclerViewScreen recyclerView() {
 return new RecyclerViewScreen(allOf(
 withId(R.id.ak_recycler_view),
 isDescendantOfA(withId(R.id.track_detail_container))));
 } 
 }

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Assertions public class TrackDetailAssertions {
 
 private final TrackDetailInteractors interactors;
 
 private TrackDetailAssertions(TrackDetailInteractors interactors) {
 this.interactors = interactors;
 }
 
 public static TrackDetailAssertions assertTrackDetail() {
 return new TrackDetailAssertions(new TrackDetailInteractors());
 }
 
 public TrackDetailAssertions hasPrivacySetToPrivate() {
 interactors.privateIndicator()
 .check(matches(isDisplayed()), "Track is not displayed as being private.");
 return this;
 } }

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@Test
 public void shouldChangeTrackToPrivateInTrackDetails() {
 givenPublicTrackDetail();
 
 trackDetailScreen.showTrackOptions()
 .tapOnMakeTrackPrivateOption()
 .tapOnConfirmInDialog();
 
 assertTrackDetail().hasPrivacySetToPrivate();
 }

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@Test
 public void shouldChangeTrackToPrivateInTrackDetails() {
 givenPublicTrackDetail();
 
 trackDetailScreen.showTrackOptions()
 .tapOnMakeTrackPrivateOption()
 .tapOnConfirmInDialog();
 
 assertTrackDetail().hasPrivacySetToPrivate();
 }

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@Test
 public void shouldChangeTrackToPrivateInTrackDetails() {
 givenPublicTrackDetail();
 
 trackDetailScreen.showTrackOptions()
 .tapOnMakeTrackPrivateOption()
 .tapOnConfirmInDialog();
 
 assertTrackDetail().hasPrivacySetToPrivate();
 }

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INSTRUMENTATION TESTING ROBOTS https://realm.io/news/kau-jake-wharton-testing-robots/

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CONFIGURING

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Test classes Single screen Event propagation Navigation

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Test class “header” @Rule public final ActivityTestRule activityTestRule = new ActivityTestRule<>(UserPreviewActivity.class, true, false); @ClassRule public static final TestRule chain = RuleChain.outerRule(AccountTestRule.add(POPULAR_CREATOR)) .around(applicationComponentTestRule()) .around(new IdlingResourceTestRule(rxIdlingResource));

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Test class “header” @Rule public final ActivityTestRule activityTestRule = new ActivityTestRule<>(UserPreviewActivity.class, true, false); @ClassRule public static final TestRule chain = RuleChain.outerRule(AccountTestRule.add(POPULAR_CREATOR)) .around(applicationComponentTestRule()) .around(new IdlingResourceTestRule(rxIdlingResource));

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starting account rule starting application component rule starting idling resource rule execute all tests finished idling resource rule finished application component rule finished account rule

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starting account rule starting application component rule starting idling resource rule execute all tests finished idling resource rule finished application component rule finished account rule

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starting account rule starting application component rule starting idling resource rule execute all tests finished idling resource rule finished application component rule finished account rule

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starting account rule starting application component rule starting idling resource rule execute all tests finished idling resource rule finished application component rule finished account rule

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starting account rule starting application component rule starting idling resource rule execute all tests finished idling resource rule finished application component rule finished account rule

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starting account rule starting application component rule starting idling resource rule execute all tests finished idling resource rule finished application component rule finished account rule

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starting account rule starting application component rule starting idling resource rule execute all tests finished idling resource rule finished application component rule finished account rule

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LocaleTestRule @Override
 public Statement apply(final Statement base, Description description) {
 return new Statement() {
 @Override
 public void evaluate() throws Throwable {
 Locale defaultLocale = Locale.getDefault();
 for (Locale locale : locales) {
 changeLocaleTo(locale);
 base.evaluate();
 }
 changeLocaleTo(defaultLocale);
 }
 };
 }

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LocaleTestRule @Override
 public Statement apply(final Statement base, Description description) {
 return new Statement() {
 @Override
 public void evaluate() throws Throwable {
 Locale defaultLocale = Locale.getDefault();
 for (Locale locale : locales) {
 changeLocaleTo(locale);
 base.evaluate();
 }
 changeLocaleTo(defaultLocale);
 }
 };
 }

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LocaleTestRule @Override
 public Statement apply(final Statement base, Description description) {
 return new Statement() {
 @Override
 public void evaluate() throws Throwable {
 Locale defaultLocale = Locale.getDefault();
 for (Locale locale : locales) {
 changeLocaleTo(locale);
 base.evaluate();
 }
 changeLocaleTo(defaultLocale);
 }
 };
 }

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LocaleTestRule @Override
 public Statement apply(final Statement base, Description description) {
 return new Statement() {
 @Override
 public void evaluate() throws Throwable {
 Locale defaultLocale = Locale.getDefault();
 for (Locale locale : locales) {
 changeLocaleTo(locale);
 base.evaluate();
 }
 changeLocaleTo(defaultLocale);
 }
 };
 }

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AccountTestRule Add / Remove account from the AccountManager Test app with popular / normal / empty user Test Sign-in

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ApplicationComponentTestRule Swap dagger graph Disable crash logs / tracking Override components

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By default, Espresso waits for UI events in the current message queue to be handled and for default AsyncTasks to complete before it moves on to the next test operation. There are instances where applications perform background operations (such as communicating with web services) via non-standard means; for example: direct creation and management of threads. In such cases, you have to use Idling Resources to inform Espresso of the app’s long-running operations.

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By default, Espresso waits for UI events in the current message queue to be handled and for default AsyncTasks to complete before it moves on to the next test operation. There are instances where applications perform background operations (such as communicating with web services) via non-standard means; for example: direct creation and management of threads. In such cases, you have to use Idling Resources to inform Espresso of the app’s long-running operations.

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IdlingResourceTestRule Register / unregister idling resource before / after test(s) Used mostly in combination with RxIdlingResource

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public class ExecutionStrategy implements Observable.Transformer {
 
 private final Scheduler subscribeOnScheduler;
 private final Scheduler observeOnScheduler;
 
 public ExecutionStrategy(Scheduler subscribeOnScheduler, Scheduler observeOnScheduler) {
 this.subscribeOnScheduler = subscribeOnScheduler;
 this.observeOnScheduler = observeOnScheduler;
 }
 
 @Override
 public Observable call(Observable observable) {
 return observable
 .subscribeOn(subscribeOnScheduler)
 .observeOn(observeOnScheduler);
 }
 
 }

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public class ExecutionStrategy implements Observable.Transformer {
 
 private final Scheduler subscribeOnScheduler;
 private final Scheduler observeOnScheduler;
 
 public ExecutionStrategy(Scheduler subscribeOnScheduler, Scheduler observeOnScheduler) {
 this.subscribeOnScheduler = subscribeOnScheduler;
 this.observeOnScheduler = observeOnScheduler;
 }
 
 @Override
 public Observable call(Observable observable) {
 return observable
 .subscribeOn(subscribeOnScheduler)
 .observeOn(observeOnScheduler);
 }
 
 }

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RxIdlingResource public ExecutionStrategy wrap(ExecutionStrategy strategy) {
 
 return new ExecutionStrategy() {
 @Override
 public Observable call(Observable observable) {
 return wrap(executionStrategy.call(observable));
 }
 }; 
 }

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RxIdlingResource public ExecutionStrategy wrap(ExecutionStrategy strategy) {
 
 return new ExecutionStrategy() {
 @Override
 public Observable call(Observable observable) {
 return wrap(executionStrategy.call(observable));
 }
 }; 
 }

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RxIdlingResource public Observable wrap(final Observable observable) {
 return observable
 .doOnSubscribe(new Action0() {
 public void call() {
 isIdle.compareAndSet(true, false);
 }
 })
 .finallyDo(new Action0() {
 public void call() {
 if (isIdle.compareAndSet(false, true)) {
 if (resourceCallback != null) {
 resourceCallback.onTransitionToIdle();
 }
 }
 }
 });
 }

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public Observable wrap(final Observable observable) {
 return observable
 .doOnSubscribe(new Action0() {
 public void call() {
 isIdle.compareAndSet(true, false);
 }
 })
 .finallyDo(new Action0() {
 public void call() {
 if (isIdle.compareAndSet(false, true)) {
 if (resourceCallback != null) {
 resourceCallback.onTransitionToIdle();
 }
 }
 }
 });
 } RxIdlingResource

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public Observable wrap(final Observable observable) {
 return observable
 .doOnSubscribe(new Action0() {
 public void call() {
 isIdle.compareAndSet(true, false);
 }
 })
 .finallyDo(new Action0() {
 public void call() {
 if (isIdle.compareAndSet(false, true)) {
 if (resourceCallback != null) {
 resourceCallback.onTransitionToIdle();
 }
 }
 }
 });
 } RxIdlingResource

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Rules are good for you Reusable Unclutter your tests from unnecessary details Separate configuration and actual tests

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BETTER FAILURES

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Making ViewInteraction great again! Wrap ViewInteraction Use a FailureHandler to provide a human explanation of what went wrong

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Caused by: junit.framework.AssertionFailedError: 'is displayed on the screen to the user' doesn't match the selected view. Expected: is displayed on the screen to the user Got: "ab{id=2131689841, res-name=track_item_private_indicator, visibility=GONE, width=0, height=0, has-focus=false, has- focusable=false, has-window-focus=true, is-clickable=false, is- enabled=true, is-focused=false, is-focusable=false, is-layout- requested=true, is-selected=false, root-is-layout- requested=false, has-input-connection=false, x=0.0, y=0.0, text=Private, input-type=0, ime-target=false, has-links=false}” […]

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public BetterViewInteraction check(ViewAssertion viewAssert, String failureMessage, Object... args) {
 viewInteraction.withFailureHandler(new FailureHandler() {
 @Override
 public void handle(Throwable t, Matcher viewMatcher) { String errorMessage = String.format(failureMessage, args);
 Throwable error = new AssertionFailed(errorMessage, t);
 defaultFailureHandler.handle(error, viewMatcher);
 }
 }).check(viewAssert);
 return this;
 }

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public BetterViewInteraction check(ViewAssertion viewAssert, String failureMessage, Object... args) {
 viewInteraction.withFailureHandler(new FailureHandler() {
 @Override
 public void handle(Throwable t, Matcher viewMatcher) { String errorMessage = String.format(failureMessage, args);
 Throwable error = new AssertionFailed(errorMessage, t);
 defaultFailureHandler.handle(error, viewMatcher);
 }
 }).check(viewAssert);
 return this;
 }

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public BetterViewInteraction check(ViewAssertion viewAssert, String failureMessage, Object... args) {
 viewInteraction.withFailureHandler(new FailureHandler() {
 @Override
 public void handle(Throwable t, Matcher viewMatcher) { String errorMessage = String.format(failureMessage, args);
 Throwable error = new AssertionFailed(errorMessage, t);
 defaultFailureHandler.handle(error, viewMatcher);
 }
 }).check(viewAssert);
 return this;
 }

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com.soundcloud.espresso.EspressoAssertionFailedError: Track is not displayed as being private. […] Caused by: junit.framework.AssertionFailedError: 'is displayed on the screen to the user' doesn't match the selected view. Expected: is displayed on the screen to the user Got: "ab{id=2131689841, res-name=track_item_private_indicator, visibility=GONE, width=0, height=0, has-focus=false, has-focusable=false, has-window-focus=true, is-clickable=false, is-enabled=true, is-focused=false, is-focusable=false, is-layout-requested=true, is-selected=false, root-is- layout-requested=false, has-input-connection=false, x=0.0, y=0.0, text=Private, input-type=0, ime-target=false, has-links=false}” […]

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GOING DEEPER

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Feature flags Based on the flavour Developing continuously Switching a flag when we want to release the feature

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GREAT BUT… HOW DO WE DEAL WITH TESTING BOTH NEW & OLD BEHAVIOUR?

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A CUSTOM TEST RUNNER! OR, HOW TO SKIP TESTS BASED ON A PREDICATE

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@RunWhen( value = SomePredicate.class, expected = false)


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public final class SomeFeatureFlagEnabled extends Predicate { 
 @Override
 public boolean evaluate() {
 return featureFlags().someFeature();
 }
 
 @Override
 public String description() {
 return “Some feature flag enabled";
 } 
 }

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public class SkippableAndroidJUnit4 extends BlockJUnit4ClassRunner {
 
 @Override
 protected Statement methodBlock(FrameworkMethod testMethod) {
 Statement base = super.methodBlock(testMethod);
 Statement statement = applyRunWhenTo(testMethod.getMethod(), base);
 
 Class> clazz = testMethod.getDeclaringClass();
 do {
 statement = applyRunWhenTo(clazz, statement);
 } while ((clazz = clazz.getSuperclass()) != null);
 return statement;
 }
 
 private Statement applyRunWhenTo(AnnotatedElement element, final Statement base) {
 RunWhen annotation = element.getAnnotation(RunWhen.class);
 if (annotation == null) {
 return base;
 }
 return new PredicateStatement(base, annotation.value(), annotation.expected());
 }
 
 }

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public class SkippableAndroidJUnit4 extends BlockJUnit4ClassRunner {
 
 @Override
 protected Statement methodBlock(FrameworkMethod testMethod) {
 Statement base = super.methodBlock(testMethod);
 Statement statement = applyRunWhenTo(testMethod.getMethod(), base);
 
 Class> clazz = testMethod.getDeclaringClass();
 do {
 statement = applyRunWhenTo(clazz, statement);
 } while ((clazz = clazz.getSuperclass()) != null);
 return statement;
 }
 
 private Statement applyRunWhenTo(AnnotatedElement element, final Statement base) {
 RunWhen annotation = element.getAnnotation(RunWhen.class);
 if (annotation == null) {
 return base;
 }
 return new PredicateStatement(base, annotation.value(), annotation.expected());
 }
 
 }

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class PredicateStatement extends Statement {
 private final Statement base;
 private final Class extends Predicate> predicateClass;
 private final Boolean expected;
 
 public PredicateStatement(Statement base, Class extends Predicate> predicateClass, Boolean expected) {
 this.base = base;
 this.predicateClass = predicateClass;
 this.expected = expected;
 }
 
 @Override
 public void evaluate() throws Throwable {
 Predicate predicate = PredicateBuilder.build(predicateClass);
 assumeThat(predicate.description(), predicate.evaluate(), Matchers.is(expected));
 base.evaluate();
 }
 }

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class PredicateStatement extends Statement {
 private final Statement base;
 private final Class extends Predicate> predicateClass;
 private final Boolean expected;
 
 public PredicateStatement(Statement base, Class extends Predicate> predicateClass, Boolean expected) {
 this.base = base;
 this.predicateClass = predicateClass;
 this.expected = expected;
 }
 
 @Override
 public void evaluate() throws Throwable {
 Predicate predicate = PredicateBuilder.build(predicateClass);
 assumeThat(predicate.description(), predicate.evaluate(), Matchers.is(expected));
 base.evaluate();
 }
 }

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GRADLE

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def unlockAll = project.task('unlockAllDevices')
 
 command.devices().eachWithIndex { device, index ->
 
 def unlocker = project.task("unlockDevice${index}", type: ForceDeviceUnlock) {
 deviceId = device.id
 }
 unlockAll.dependsOn unlocker
 }
 
 project.afterEvaluate {
 project.tasks.findAll {
 it.name.startsWith('connected') && it.name.endsWith('AndroidTest')
 }*.dependsOn(unlockAll)
 }

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def unlockAll = project.task('unlockAllDevices')
 
 command.devices().eachWithIndex { device, index ->
 
 def unlocker = project.task("unlockDevice${index}", type: ForceDeviceUnlock) {
 deviceId = device.id
 }
 unlockAll.dependsOn unlocker
 }
 
 project.afterEvaluate {
 project.tasks.findAll {
 it.name.startsWith('connected') && it.name.endsWith('AndroidTest')
 }*.dependsOn(unlockAll)
 }

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class ForceDeviceUnlock extends AdbTask {
 
 @TaskAction
 void unlockDevice() {
 println 'Trying to unlock device using UnlockHelperApp (if installed)'
 def startHelperAppCommand = ['shell', 'am', 'start', '-n', 'io.appium.unlock/.Unlock']
 assertDeviceAndRunCommand(startHelperAppCommand)
 
 println 'Trying to unlock device using unlock keycode'
 def pressUnlockKey = ['shell', 'input', 'keyevent', '82']
 assertDeviceAndRunCommand(pressUnlockKey)
 
 println 'Sending "home" keycode to reset the screen'
 def pressHomeKey = ['shell', 'input', 'keyevent', '3']
 assertDeviceAndRunCommand(pressHomeKey)
 }
 }

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class ForceDeviceUnlock extends AdbTask {
 
 @TaskAction
 void unlockDevice() {
 println 'Trying to unlock device using UnlockHelperApp (if installed)'
 def startHelperAppCommand = ['shell', 'am', 'start', '-n', 'io.appium.unlock/.Unlock']
 assertDeviceAndRunCommand(startHelperAppCommand)
 
 println 'Trying to unlock device using unlock keycode'
 def pressUnlockKey = ['shell', 'input', 'keyevent', '82']
 assertDeviceAndRunCommand(pressUnlockKey)
 
 println 'Sending "home" keycode to reset the screen'
 def pressHomeKey = ['shell', 'input', 'keyevent', '3']
 assertDeviceAndRunCommand(pressHomeKey)
 }
 }

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class ForceDeviceUnlock extends AdbTask {
 
 @TaskAction
 void unlockDevice() {
 println 'Trying to unlock device using UnlockHelperApp (if installed)'
 def startHelperAppCommand = ['shell', 'am', 'start', '-n', 'io.appium.unlock/.Unlock']
 assertDeviceAndRunCommand(startHelperAppCommand)
 
 println 'Trying to unlock device using unlock keycode'
 def pressUnlockKey = ['shell', 'input', 'keyevent', '82']
 assertDeviceAndRunCommand(pressUnlockKey)
 
 println 'Sending "home" keycode to reset the screen'
 def pressHomeKey = ['shell', 'input', 'keyevent', '3']
 assertDeviceAndRunCommand(pressHomeKey)
 }
 }

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class ForceDeviceUnlock extends AdbTask {
 
 @TaskAction
 void unlockDevice() {
 println 'Trying to unlock device using UnlockHelperApp (if installed)'
 def startHelperAppCommand = ['shell', 'am', 'start', '-n', 'io.appium.unlock/.Unlock']
 assertDeviceAndRunCommand(startHelperAppCommand)
 
 println 'Trying to unlock device using unlock keycode'
 def pressUnlockKey = ['shell', 'input', 'keyevent', '82']
 assertDeviceAndRunCommand(pressUnlockKey)
 
 println 'Sending "home" keycode to reset the screen'
 def pressHomeKey = ['shell', 'input', 'keyevent', '3']
 assertDeviceAndRunCommand(pressHomeKey)
 }
 }

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DEVICE GOTCHAS

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“Ok Google” Autocomplete Updating ADB Update Dialog ☀ &

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No content

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QUESTIONS? @florianmski