March 09, 2023

Top 20 AWS Device Farm Interview Questions and Answers


                AWS Device Farm enables developers to test and interact with actual Android and iOS devices in the AWS Cloud, improving application quality, time to market, and customer happiness. Developers may conduct automated tests simultaneously across hundreds of real devices using their uploaded apps and test scripts, receiving results, images, videos, and performance data in a matter of minutes. Also, they can use their web browser to swipe, gesture, and interact with a device to diagnose and replicate client concerns.

 

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Ques. 1): How do you dispose of the equipment when my testing is finished?

Answer:

We carry out a number of cleanup procedures on each device when test execution is over, including uninstalling your software. The device will be taken away and no longer be available if we are unable to confirm the removal of your app or any of the other cleanup procedures.

It is possible for data to remain across sessions in some circumstances, particularly if you access the device system outside the context of your app, even though we constantly add new cleanup stages and enhance the cleanup procedure. It is advised that you refrain from providing or entering sensitive information such as account information (e.g., Google Account, Apple ID), personal information, and other security-sensitive details during your automated test and remote access sessions because AWS Device Farm records video and logs of all activity taking place while you use each device.

 

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Ques. 2): Amazon Device Farm should be used by whom and why?

Answer:

AWS Device Farm is made for programmers, QA groups, and customer service agents that create, test, and support mobile apps in order to improve the quality of their applications. Due to the variety of device types, OS and firmware changes, carrier and manufacturer customizations, and reliance on other apps and remote services, application quality is becoming more and more crucial while also becoming more complex. Developers, QA, and support staff may execute both automated tests and manual jobs like replicating customer concerns, exploring new functionality, and carrying out human test plans thanks to AWS Device Farm, which speeds up the development process by executing tests on numerous devices. AWS Device Farm also offers significant savings by eliminating the need for internal device labs, lab managers, and automation infrastructure development.


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Ques. 3): Are my application, tests, and other files stored on your servers? How much time?

Answer:

After 30 days, apps and test packages are automatically deleted. Artifacts such as logs, videos, and other recordings are kept for 400 days. Via the Amazon Device Farm GUI or API, you may also decide to delete files and results whenever you choose.


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Ques. 4): How do I choose my equipment? Can I run another test on the same machine?

Answer:

Devices are chosen for Automated Testing from a group known as a device pool. Although certain curated device pools are automatically offered, you can also make your own. All the devices in the designated pool that are appropriate for your application and tests will be subjected to execution of the tests. You choose the desired device for remote access based on its make, model, carrier option, and operating system version. Afterwards, if desired, you can upload applications and other files and modify other device settings. The display of the accessible device that matches your request is subsequently displayed in your browser via Device Farm. After that, you can interact with the gadget and take screenshots and videos.


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Ques. 5): I test using an automation framework. Which frameworks do you support?

Answer:

Currently, we support Appium Java JUnit, Appium Java TestNG, Appium Python, Calabash, Instrumentation (Includes JUnit, Espresso, Robotium, and any instrumentation-based tests), UI Automation, UI Automator, and XCTest for testing apps for iOS, Android, and FireOS (Including XCUI and KIF).


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Ques. 6): I want to provide my app access to media or other data. How can I go about doing that?

Answer:

A .zip archive that you submit can be up to 4 GB in size. On iOS, it will be extracted to your app's sandbox; on Android, it will be extracted to the root of external memory. We will automatically put the file into the directory appropriate for the OS version for Android expansion files (OBB).

 

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Ques. 7): What is a test report for an Amazon Device Farm?

Answer:

Pass/fail information, crash reports, test logs, device logs, screenshots, videos, and performance statistics are all included in AWS Device Farm test reports. Reports provide both high-level statistics like the frequency of a specific fault and detailed per-device data. Results from Remote Access include a video of the session as well as logs.


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Ques. 8): What is a device minute?

Answer:

The billing unit is a device minute. Device minutes are the number of minutes it takes to install, run, and remove your app and tests from each device you've chosen for your test run. No matter the equipment, test, or application type, the unit price is fixed. Only tests with no device or system faults are charged for device minutes. Similar to this, device minutes for Remote Access sessions are calculated from the time it takes to configure a device to your specifications until all of your installed apps and data are completely removed from the device.


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Ques. 9): What does AWS Device Farm's desktop browser testing entail?

Answer:

You may run your Selenium tests on several desktop browsers and browser versions that are hosted in the AWS Cloud thanks to Device Farm. For Selenium testing, Device Farm uses a client-side execution approach, meaning that while your tests run locally on your workstation, they communicate with browsers hosted on AWS Device Farm via the Selenium API.

 

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Ques. 10): What is a minute of instance?

Answer:

The billing unit for Device Farm's desktop browser testing is an instance minute. The time it takes to run your tests on each of the browser instances you've chosen for your test run is measured in instance minutes. No matter which browser or version of the browser you choose, the price per unit remains at $0.005. Whether the EC2 instance hosting the browser is started, initialised, or shut down, there are no additional fees from our end.

 

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Ques. 11): You alter my app, right?

Answer:

On iOS, we resign the app and swap out the embedded provisioning profile with a wildcard profile. If you give us the information, we will include auxiliary data in the application package before installation so that it is available in the sandbox for your programme. Some rights are removed when the iOS app is resigned. Related Domains, Game Center, HealthKit, HomeKit, Wireless Accessory Setup, In-App Purchasing, Inter-App Audio, Apple Pay, Push Notifications, and VPN Configuration & Control are included in this.

We shut off the Android app. Functionality that rely on the app signature, such the Google Maps Android API, may be broken as a result. Additionally, it might activate anti-tampering and anti-piracy features offered by goods like DexGuard. For built-in tests, we may modify the manifest to include permissions required to capture and save screenshots.

 

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Ques. 12): Can I experiment with various carrier connections and setups?

Answer:

While testing actual carrier connections is not possible, the network shaping functionality allows you to mimic different connection kinds and circumstances. You can choose from pre-made network profiles like "3G" or "Lossy LTE" when scheduling a run, or you can design your own by adjusting factors like throughput, jitter, and loss. During your tests, the profile you select will be used to shape and modify the WiFi communication from the device. By altering network parameters in your test scripts, you can emulate dynamic environments as well.

 

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Ques. 13): How long will it be before my test actually begins?

Answer:

Tests are immediately added to a queue and begin running shortly after. In the event that one or more devices are unavailable, test execution for those devices will be put on hold until they are. The other devices in your test run will continue to undergo testing.

 

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Ques. 14): Can I test my web application on actual mobile devices using the Amazon Device Farm?

Answer:

Yes. Appium is supported by Device Farm for web app testing on actual mobile devices. For additional information, see our Appium Web Testing developer guide. Please be aware that Device Farm uses a server-side execution mechanism for testing on actual mobile devices; as a result, you must upload your tests to the service.

 

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Ques. 15): What is Fuzz used for?

Answer:

After launch, Fuzz will begin testing your UI for flaws. It quickly streams arbitrary user input (touches, swipes, keyboard input) to your app. The quantity of events, the interval between events, and the randomization seed can all be customised. The same series of events will occur when the same seed is used in all test runs.

 

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Ques. 16): Does AWS Device Farm have an API that can be used to perform tests and retrieve the results?

Answer:

Yes. We offer a Gradle plugin that works with Android Studio and a plug-in for the Jenkins continuous integration system. Also, all console capabilities, including setting up a test and receiving test results via an API, are programmatically supported by AWS Device Farm.

 

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Ques. 17): My tests generate and save additional log files. Will I see them in my AWS Device Farm reports?

Answer:

The report will contain any log entries that you write to logcat (for Android) or the device log (for iOS). Despite the fact that you can use the device or device host's Internet connection to transfer files via your test script, AWS Device Farm does not gather any unusual logs or other artefacts.

 

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Ques. 18): What if I need to add or delete device slots because my testing requirements change?

Answer:

Any time you add device slots, they become immediately usable for you. Also, you have the option to at any time terminate your subscription for one or more device slots; the termination will take effect on the day of your subsequent renewal (the day of the month that you purchased your first active device slot).

 

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Ques. 19): How do device slots and the unmetered plan work?

Answer:

Unlimited testing and remote access are available with unmetered options starting at $250 per month. Unmetered prices start at $250 per slot per month and depend on how many device slots you buy for each usage category (such as automated testing or remote access) and device family (such as Android or iOS). Concurrency is corresponding to device slots.

Device Farm will conduct your tests on up to ten devices at a time until all tests are finished on your chosen devices, for example, if you buy ten automated test Android device slots and arrange a run on 100 Android smartphones. You may obtain your findings more quickly if you bought additional slots. You are charged a set fee of $250 per device slot per month, regardless of how many tests or remote access sessions you have. Your membership for one or more device slots can be cancelled at any time, and the cancellation will take effect on the date of your subsequent renewal (the day of the month that you purchased your first active device slot). Through the Amazon Device Farm UI, AWS Command Line Interface (AWS CLI), or AWS Device Farm API, you can buy slots.

 

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Ques. 20): Can I use both personal and public devices at once?

Answer:

Yes. You can choose between your private and public devices when configuring a test run or remote access session. Device pools made up of both private and public devices are another option.

 

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