Appium is traditionally see a & quot; black box & quot; testing tool, meaning it has no access to your application & # x27; s internal methods or province. We use Appium aright by thinking like a user would (interacting with the surface of the app), not thinking like an app developer would (calling internal codification straightaway).

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Black box testing has its restriction, principally in requiring the automation to go through user steps many times, even when it would be more convenient to skip to a sure known province. This is one reason that some modern testing technologies, like Espresso, allow for awhite box testingapproach, where internal app methods are accessible from the automation context.

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Thanks to Appium & # x27; s Espresso driver, Appium can now take advantage of this approach. (If you recall, Espresso is also what enable us to). To make this more general white box strategy employment, you take two things:

1. Knowledge of a particular public method located on your Android application, activity, or UI ingredient. This is the method that your examination script will finally trigger in the line of your automation. You can either code this method up yourself or ping your Android app developer to add one that encounter your specifications.
2. The new mobile: backdoor method available on the Appium Espresso driver. This is the existent method you will call in your trial code, which will tell the Espresso driver what to run inside your app. (It & # x27; s ring & quot; backdoor & quot; because Appium is getting inside of your app through the & quot; back doorway & quot; of Espresso, not the & quot; front doorway & quot; of the UI that a user would use. This approach was 1st publically suggested by Rajdeep Varma in hisAppiumConf 2018 talk, and Rajdeep was the one who contributed the code to create it a realism in Appium today. Thanks!)

Pro tip: Tools like SUSA can handle this autonomously — upload your app and get results without writing a single test script.

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To instance how this works, I & # x27; ve lend a method to the application class ofThe App, in its MainApplication.java:

public nihility raiseToast (String message) {Toast.makeText (this, message, Toast.LENGTH_LONG) .show ();}

This method simply take an arbitrary string and habituate it to make an Android Toast message seem on the screen. The result of calling this method looks like this:

With a normal Appium test, there & # x27; s no way I would be able to spark this toast to appear, unless the developer had hooked it up to a text field and a button. But with roving: backdoor, I can simply point the name of the method I want to call in my app, the types and values of its parameters, and off we go! So, here & # x27; s how I would do this in Java:

ImmutableMapscriptArgs = ImmutableMap.of (`` target '', `` application '', `` methods '', Arrays.asList (ImmutableMap.of (`` gens '', `` raiseToast '', `` args '', Arrays.asList (ImmutableMap.of (`` value '', `` Hello from the test script! ``, `` character '', `` String ''))))); driver.executeScript (`` mobile: backdoor '', scriptArgs);

It & # x27; s a little verbose, so let & # x27; s expression at the argument I & # x27; m passing to mobile: backdoor as a JSON object instead:

{`` mark '': `` covering '', `` methods '': [{`` name '': `` raiseToast '', `` args '': [{`` value '': `` Hello from the test script! ``, `` type '': `` String ''}]}]}

I set two main bits of information: thetargetof my backdoor (which type of thing am I call the method on), and themethodsI desire to call on it. In this case I have implemented my method on the application class, so I delineate covering as the mark. Other possible value are activity (for methods implemented on the current activeness), or element (for method apply on a specific UI element -- in this causa, an elementId argument is too required).

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The most significant information resides in methods. In our instance I & # x27; m merely calling one method, though we could call multiple. For each method, we receive to specify its gens (raiseToast -- it must exactly match the gens in my Android codification), and the potentially multiple arguments we want to pass in to call the method with. For each of these arguments in turn we must specify both its type and value (the type is necessary because Java!).

Once we & # x27; ve got all this put together, we simply bundle it up and pass it as the argument to executeScript (& quot; mobile: backdoor & quot;). Using the ImmutableMap.of construction as I & # x27; ve shown above is the most concise way, I & # x27; ve found so far to do this in Java.

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That & # x27; s all there is to it! This method in conjunction with the Espresso driver frees us from the shackles of the UI, and enables us to target specific method inside our app. The possibleness here are endless, so please write to us and let us know what cool things you find to do with the feature. But remember, with great power comes great responsibility! It would probably be very leisurely to use this lineament to ram your app during screen, too.

Test your mobile apps and browsers on existent Android devices.!

Here & # x27; s a full exemplar that shows the toast message be raised on our test app:

import com.google.common.collect.ImmutableMap; importee io.appium.java_client.AppiumDriver; significance java.io.IOException; import java.net.URL; import java.util.Arrays; import org.junit.After; meaning org.junit.Before; significance org.junit.Test; import org.openqa.selenium.remote.DesiredCapabilities; public family Edition051_Android_Backdoor {private String APP = `` https: //github.com/cloudgrey-io/the-app/releases/download/v1.8.1/TheApp-v1.8.1.apk ''; individual AppiumDriver driver; @ Before public nihility setUp () drop IOException {DesiredCapabilities caps = new DesiredCapabilities (); caps.setCapability (`` platformName '', `` Android ''); caps.setCapability (`` deviceName '', `` Android Emulator ''); caps.setCapability (`` automationName '', `` Espresso ''); caps.setCapability (`` app '', APP); driver = new AppiumDriver (new URL (`` http: //localhost:4723/wd/hub ''), detonator);} @ After public emptiness tearDown () {try {driver.quit ();} haul (Exception ign) {}} @ Test world vacancy testBackdoor () {ImmutableMapscriptArgs = ImmutableMap.of (`` prey '', `` covering '', `` method '', Arrays.asList (ImmutableMap.of (`` name '', `` raiseToast '', `` args '', Arrays.asList (ImmutableMap.of (`` value '', `` Hello from the test handwriting! ``, `` type '', `` String ''))))); driver.executeScript (`` mobile: backdoor '', scriptArgs); try {Thread.sleep (2000);} catch (Exception ign) {} // pause to permit visual verification}}

(As always, the entire code sampling is too upon GitHub)

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