Mobile Testing Interview Questions & Answers for 2025

iOS comes with several in-built testing frameworks that developers can use to test their applications. iOS test frameworks evaluate how well iOS apps perform over an Apple device in order to capture and initiate user actions in response to user interface interactions. The iOS testing frameworks are not entirely mutually exclusive. Developers can sometimes use an appropriate combination of different iOS testing frameworks to conduct tests. In that way developers can test the application for various platforms and devices to verify if the application is working well and performing the way it was intended to across various platforms and devices. 

The following are the top 5 testing tools used in iOS testing framework: 

1. Appium 
2. XCTest/XCUITest 
3. Detox 
4. Calabash 
5. Earl Grey

Below mentioned are some of the well-known and most-used Apple device testing apps by mobile application testers to accelerate apple device app testing. 

• Appium: Appium has established itself as one of the toolkits of choice for developers. It is well-liked both by hybrid and native app developers, largely because of its adaptability and sizable accessible community. If you run into any issues while testing, the vast open-source community that Sauce Labs built and supports will be able to point you in the right direction. Additionally, it's one of the easiest iOS testing tools available. Because your software uses a standard API, you are not required to configure an SDK on it, nor do you have to rewrite it. 
• XCTest/XCUI Test: XCTest and XCUITest are two components of its native library that are included with Apple's Xcode. One examines the backend components, while the other examines the user interface, or how your app appears to the user. Both of them are fantastic choices with all the benefits you'd anticipate from Apple's eco-system 
• KIF: KIF, which is directly connected to XCUITest, was created especially to check the user interface. Another benefit of its close ties to Xcode is that it integrates directly into the Xcode project, saving you the trouble of employing an extra web server or using up additional memory for any extra packages. It is incredibly easy to set up. You only need to add the KIF module to your project if it already has XCTests configured. Additionally, the tests are quicker than that of the XC tools. Realism is another important advantage. Tests are extremely user-like because they mimic how a user will indeed use the app in the actual world. KIF can also simulate a variety of different user engagements. 
• Bugfender: Okay, time for a little self-promotion. We wanted to highlight Bugfender, our own product. It's great for finding troubles and explaining why they occurred, even though it doesn't perform quite as well as a few of the other techniques on our list (in fact, we use a number of these tools in conjunction with it). We created Bugfender to address issues like, "Well, it works perfectly fine for me," as well as bugs that didn't affect our own equipment. We earlier had to continue access to the impacted devices or ask our users to characterize them in order to solve this kind of issue. 

understand how they help you improve your application testing strategy and operations. 

• Apache JMeter: It is used to evaluate the effectiveness of dynamic web applications as well as static resources. To stack the functional test behavior and gauge the application's performance, this tool was specifically created for JAVA applications. With the help of this open-source tool, users or developers can use the source code to create new applications. In order to test a server's power or look into how well it performs overall under various load conditions, it can be used to simulate a big workload on a server, item, or network. 
• LoadRunner: One of the most potent performance testing tools, it supports performance testing across a wide range of protocols, techniques, and strategies that can be applied. It quickly pinpoints the most frequent reasons for performance problems. Additionally, precisely forecast the capacity and scalability of the application. 
• LoadNinja: SmartBear is the engine behind LoadNinja. Instead of writing load testing scripts, product managers and the manufacturing engineer would then build the application with the aid of this tool. We can monitor user activity, locate performance problems, and immediately troubleshoot them. It will swap out the emulators for actual browsers. 
• WebLoad: With the aid of dynamic loading, functional testing, and stress testing, the test application is tested using the WebLOAD testing tool. The WebLOAD tool integrates effectiveness, expandability, and integrity as one process for mobile and web authentication. 
• LoadComplete: It's yet another instrument for testing productivity. It is employed in the development and execution of automation testing for web servers and services. Web services and all browser types are supported. When we experience a heavy load, it will evaluate the performance of our web server. Throughout the test runs, we can monitor various server metrics with the aid of this tool, such as CPU usage. 
• NeoLoad: Neotys creates a testing tool known as NeoLoad. Performance analysis scenarios are tested using the NeoLoad. NeoLoad can help us identify the areas where the advancement of mobile apps and websites is slowed down. 
• LoadView: It is driven by the By Dotcom Monitor. This tool allows us to demonstrate the application's actual performance. It is utilized for load testing in actual browsers that provide accurate data. It is a cloud-based software that takes less time to deploy. 

Mobile Application Testing Automation; and it is done for various reasons such as: 

• Increased Efficiency: Compared to manual testing, automated tests may be conducted considerably more quickly, which can save a lot of effort and time. Testing can be sped up even more by running automated tests concurrently. 
• Better Consistency: Test automation can be executed repeatedly, helping to guarantee that the exact test is executed repeatedly with the exact inputs and circumstances. By doing so, the likelihood of human error can be decreased and test dependability can be increased. 
• Repeatability: Multiple runs of automated tests can help find any problems that might not have been discovered during the original test run. This is enormously beneficial if regression tests repeatedly fail, since it can help find and address the issue's underlying causes. 
• Improved Scalability: In order to make certain that the app operates as anticipated across many platforms, automation tests may be conducted on a variety of hardware and software combinations. This may be particularly helpful when regression testing repeatedly fails since it can help find and resolve problems that could be specific to a specific device or setup. 
• Cost-effectiveness: In the long term, automated testing is frequently less costly than manual testing since it eliminates manual procedures and the associated expenses. This is especially important in cases where regression testing frequently fails, as it can reduce the costs of repairing and re-testing the app. 

Following are some of the most common bugs found while performing mobile app testing: 

• Crashed After You Tapped A button: When You Press a Button, It Crashes One of the most typical bugs discovered during mobile testing is this. This frequently occurs, especially with hidden buttons. This is similar to a time bomb. The bomb detonates when you depress the activating device. The button within the application serves as the activating device in this case. If you don't press the button, you'll strike them. The application will then crash as a result. 
• No Progress Indicator: There is no progress bar. Another typical bug that is discovered when testing mobile apps. A progress indicator notifies a client that a specific activity is ongoing. If your application doesn't have an advancement indicator, users may keep tapping the file or publish button in the belief that nothing is happening. 
• Portrait and Landscape Orientation: Landscape and portrait orientation In any case, if you decide that you need both to work flawlessly with your app, you must make sure that users can quickly and easily switch between the two. This means that the application's current state must be saved when the client switches the application's orientation from portrait to landscape or vice versa. 
• No Errors Handling: not handling errors Another crucial point to keep in mind is that you should always show a client an error. Keep in mind that while showing errors straight first from the server can provide valuable information for software engineers, it rarely does so for the end user. Therefore, it is always preferable to display invalid login certifications rather than a 401. 

When they first appeared, online Android emulators were a godsend for developers. They could cross test their apps across different devices without physically buying the phones. The majority of Android emulators were inexpensive and easy to install. The ability of online Android emulators to simulate hardware and software behavior, in particular, made it simple for developers to spot unexpected behavior during early testing. However, as the app market expanded, so did user expectations. The full picture of how the app would operate on a customer's phone could not be obtained by testing all of its features on an internet Android emulator.

For instance, a user might install a new app on their device and discover the following day that their battery is depleting rapidly. When he checks the battery usage, the new app turns out to be the problem. Hit uninstall, and he does. He then goes to the Play store and complains about the battery-sucking issue with the app. The app won't be downloaded by the following twenty participants who see that review.

Using an online Emulator to find these bugs is difficult. Online emulators take a long time to load because they must duplicate the hardware and software components. Thus, making the testing process as a whole slower.

Online Android emulators are unsuitable for extensive testing due to these and other drawbacks. You can only run a certain number of OS versions on an Emulator. You can run about 8 emulators at once, even on a powerful PC with HAXM velocity support. Even if you are able to set up every online emulator you require, a single minor issue can cause the system to crash and force you to restart.

Simulating an environment to replicate the operation and setup of a different target device is known as simulation. A simulator is employed for study and analysis as opposed to emulation. By utilizing a simulator, you can produce a digital setting that resembles the actual target device. In the end, the simulation process demonstrates how the device would operate in the real world. A simulator, however, doesn't exactly replicate activity in the real world. 

• Simulator Capabilities: Your operating system is layered with an iOS simulator, which runs your app and imitates the iOS. This simulation can be viewed in a window on an iPhone or iPad. The iOS simulation model is quicker than that of the Android emulator because there isn't any machine translation taking place. 
• Simulator Limitations: Unfortunately, a macOS platform is the only one that supports using the iOS simulator. This is so that the simulator can manage the Interface, runtime, and other functions by using Apple's native Cacao API. Simulators fall short in simulating rechargeable battery states or cellular disturb, especially in comparison to Android emulators. 

Detox is a structure made for mobile testing which enables rapid and reliable implementation of tests without having to use any additional systems. 

It’s been built into the app and activates upon launching the application. 

Below mentioned are some of the unique characteristics of detox: 

• Detox makes debugging much simpler, especially when compared with different test automation frameworks. 
• Tests can be run much faster with detox. 
• React native unification with applications is simple.

Basically, A/B testing is a method used to test two different versions of an application to verify which one performs better. The following 4 steps can be used to conduct A/B tests on apple applications: 

1. Configuration: Two variants A and B of the apple application are created. 
2. Define the Success Metrics: Specify the goal and the measures using which the application's success will be assessed. 
3. Execution: Apps need to be tested to verify their performance. You can verify both the variants at the same during execution. 
4. Analyze and decide which version is best to release. 

Sanity testing is basically conducted during the initial mobile app testing stages, before starting with the comprehensive testing processes. The main reason behind performing sanity testing on mobile applications is to find any major issues or defects that might potentially affect the application’s performance post-launch. Once the new app build is ready and hosted in local servers, developers do a sanity test to verify if it’s stable enough to move further for testing. 

Below are the 5 basic instances where developers perform a sanity test on a mobile application: 

1. Before the app is pushed to production. 
2. After an update is rolled out. 
3. Updating and installing apps. 
4. After doing any sort of integration 
5. After resolving any errors or bugs 

Testing for mobile apps is more difficult than testing for computer and web apps. Knowing the potential obstacles, you might face is necessary to develop a testing strategy. Device decentralization, screen resolution and Operating system segmentation, manufacturer dislocation, localization, network operators' and users' mobility, as well as a variety of mobile applications and testing tools, are common obstacles for mobile testing.

Select Your Handset Mix for Testing: Because there are so many different mobile device designs and manufacturers on the market, relying solely on Samsung and Apple devices is no longer a safe bet. Even though iPhones continue to be the most widely used mobile phones worldwide, businesses like Huawei, HTC, and Vivo are upending marketplaces in densely populated countries like India and China. Choosing which gadgets to verify on can be daunting given the breadth of options. 

Employ an appropriate combination of actual devices, emulators, and simulators: Decide where to operate your mobile test results now that you've your test scenarios and device combination in place. We advise using a combination of actual devices and simulated gadgets as part of the mobile test to make the most of your attempts. The first option guarantees more precise testing results, while the second offers more agility. 

A combination of equipment, libraries, and principles that is used for testing mobile apps is known as a mobile testing framework. With techniques for creating test cases, conducting assessments, and presenting findings, these frameworks offer an organized approach to testing. Additionally, they may offer test automation, execute tests on many hardware systems and devices, and integrate with other tools like continual integration solutions. 

They can be cross-platform, enabling you to perform tests on your application on many platforms with a unified model, or they can be platform-specific, such as Espresso, which is used for performing tests on Android devices, and XCTest, which is used for testing iOS applications. Appium and Selenium are a few of the well-known mobile testing frameworks. 

Using a mobile testing framework can be helpful in creating your app more quickly, at a lower cost, and with higher quality results. You may use it to make sure that your program runs properly on a variety of hardware, OS, and screen resolutions. 

A Mobile testing framework is mainly responsible for: 

• Determining the format to define expectations 
• Developing a mechanism to drive the entire app testing process 
• Perform tests and provide reports 

An Android test framework consists of three components, as follows: 

Application Package: This is the target app on which the testing is being conducted on. Also known as app package or package file, it is a file format that is used for distributing and installing the application on a mobile device. 

Instrumentation Tester: Instrumentation tester is a test case runner that is responsible for running test cases on a target app. It consists of tools for building tests and an SDK equipment that helps apes write programs responsible for controlling android devices. For example: Monkey Runner. 

Test Package: Test package mainly consists of two different classes namely mock objects and test case classes, in which the test case classes are comprised of test methods that are to be performed on a target app, whereas a mock object comprises mock data that needs to be used as sample input data while running test cases. 

The iOS testing framework XCTest consists of various components which are as follows:

• XCTest Case: The fundamental framework for a test case is provided by this class. It contains techniques for establishing and dismantling tests as well as techniques for claiming that particular requirements are satisfied.
• XCTest Expectation: It defines the requirements for asynchronous testing.
• XCUI Application: This provides a user interface for engaging with user interface components like buttons, textboxes, and tags in iOS apps.
• XCUI Element: This represents just one UI component in an application. It offers ways to communicate with it and search for the item.
• XCTest Assertion: This group of operations is used to confirm the test cases' anticipated results.
• XCTest Performance: By keeping track of how long it takes to run particular sections of the code, this is used to evaluate how well the program performs.
• XCTest Suite: Various test cases are compiled into a unified unit using this type for simple administration and implementation.
• XCTest Runner: Running test cases, presenting the findings, and delivering the general framework for the testing phase are all the responsibilities of this module.

Appium is one of the leading open-source test automation frameworks that enable testers to perform cross-platform native test automation on mobile devices. It allows for testing on both Android and iOS platforms. It was built upon the Selenium test framework in order to provide automated testing options for mobile applications.

Testing and programming experts who are already acquainted with Selenium will discover the switch to Appium rather simply because it is based on the exact same JSON protocol.  With its additional features, it is possible to test native, web, and hybrid mobile applications that are running on both the Android and iOS operating systems. Individuals are not required to download any additional applications on their devices to enable Appium tests because they are independent of language. Users of Appium receive ongoing assistance for resolving their problems from a sizable and active community.

To fully appreciate the advantages of test automation, Appium users must become comfortable with the new scripting language and understand the best ways to query their system. The training time is accelerated by the requirement that users grasp native app selection ideas and the Appium framework in order to fully exploit Appium's capability for native app testing.

It's a testing framework that allows the testing of Android apps on JVM without the need for an emulator or testing device.

Its key characteristics are as follows:

Without the app being launched on a gadget or emulator, it provides us with the ability to run tests inside Android Studio. The real miracle of Robolectric lies in Shadow Classes, which are rewritten versions of the Android standard library. It is a copy of the Android class with a few useful functions revealed. Amazing, isn't it? You could test features of Android like:

• Activity
• Services
• Broadcast Receive

Below mentioned are some of the most common challenges faced during application testing. 

• Device Fragmentation: The biggest problem the application development team is trying to solve is device fragmentation. It alludes to a program running on a variety of hardware and operating systems. 
• Different Screen Resolutions: The amount of devices designed to cater to various user groups has increased along with the growth in mobile users. Newer smartphones come in a variety of screen sizes and resolutions to give users a wider range of options. 
• Updated Device Models: Smartphone users grow significantly each year. To accommodate this growth, a wide variety of mobile models are readily available today. It is expected that developers will produce a smooth-running, compatible app. The description of gadgets for which applications have to be tested is too long and contains too many models with various device configurations. The use of only emulators and simulators does not completely solve this ever-increasing task. 
• Testing Apps In Staged Environment: Staging is the final step in the delivery phase even before an app is released to production in a software development process. Even though the app is tested by the developers before being given to the test team, it must still undergo extensive testing before being put into use. 
• Mobile Network Issues: Fast internet is enjoyable for a tech team to use, but not all end users agree. A rise in smartphone usage suggests that it has also reached suburban areas, where speed is medium. While traveling to remote locations when the connections are unstable, mobile users would also require certain features. 
• Real User Condition Test: The main disadvantage of emulators and simulation software for testing apps is that they simulate the atmosphere of real devices but do not offer testing under actual user circumstances. Since their benefits are constrained, real devices should never be seen as a replacement for emulators and simulators. 
• Consistent User-experience: Both the UI and the application's features and functionality must be designed with the user in mind. These requirements must be met in order to provide an uniform user experience. Trying to make the layout and functionality work together seamlessly is not always easy. 

In general, the problem depends upon that distinct OS/device version; the same thing may work with one OS version but not on another. As an illustration, we encountered a problem whereby our application was perfectly alright on iOS 6.x gadgets but crashed when a few modules were tapped on iOS 5.x gadgets.

Yes, there are always some things that users need to be aware of. The very first point to do is to confirm that each tool has been installed correctly. The next consideration is to make sure that the app launches even if there is no internet access. The next step is to pay close attention towards the application's alignment, which occasionally requires users to just uninstall it. The next step will be for the users to confirm that now the software performs as expected when operating on a separate device and document its response.

There are numerous testing tools accessible, including test automation offerings like Selenium, open-source platforms like Appium, and the test IO framework. Selecting the right testing tool can make or break the release of your iPhone application.

When the interviewer asks you this kind of mobile functional testing interview questions, then all you have to do is, take a moment to think back on all the testing procedures you have performed previously and create a detailed narration of your experience with all those procedures like below to help the interviewer understand what all things you have done as a tester and determine your qualifications.

Installation must be done first, followed by checks of the application's fundamental functionality and connectivity-related items before the build is uninstalled to see how the application reacts to interruptions made during installation and disruptions scenarios made when the application requests a network call. During network calls, we test for low network and poor connectivity as well. Upgrade to a newer version from an earlier one. If the software supports it, you can navigate without a network. The application's compatibility with various phone types, including those with external buttons and those without them and phones beyond this flip phone.

The monkey process merely ensures that individuals have access to configuration settings without encountering any difficulties. Additionally, it merely verifies that all of the error-handling options are accessible. Additionally, users can quickly understand the operational limitations. They are used to test if an application is stable and robust. It is done by simulating a large number of unpredictable scenarios and inputs. Monkey tools are used to test various things such as testing the stress levels of an app, random input testing to find bugs, automation testing, for overall coverage of an app, and simulating various kinds of user behaviors.

The first feature of the automated test tool is assistance for multiple platforms, allowing even prospective user needs to be conveniently met. The script must be highly usable overall, and the instrument should meet some simple or complicated unlocked bootloader requirements. This is due to the fact that some users frequently install a custom ROM on their devices, which frequently violates MDM laws and causes problems. The tool's capacity to support the new OS versions comes next. The device ought to be capable of providing the program code, if at all possible.

• When Flexibility is Required: Though manual processes give testers more operational flexibility, they are not always as precise as automation. This frequently implies that the exact code and scripts will be employed every time since test automation is intrinsically useful for repetitive cases. According to Base36, creating test cases, using the automation tool to program them, and afterward trying to run the test are all time-consuming if testers would like to work on an idea those who have straight away. In this situation, manual processes would be simpler and quicker to carry out. Base36 said, "With testing tools, you can just test rapidly and observe the results. "Setting up automated tests takes more time, which prevents you from 
• For Active Short Term Projects: Automation calls for significant investment and planning both of which may not be necessary for quick projects. This project's automation could cost too much upfront compared to the value and investment return it will provide. In this case, the testing process would be less expensive and more profitable overall. In short-term projects, where the cost of setting up automation outweighs the benefits, Overbaugh said, "test automation will not really make sense." I've worked on small projects that only added a few features and shared very little or no code with other people. 
• Testing Usability: The user experience of an application can make a big difference in whether it succeeds or fails. To ensure there are no defects, this goes far beyond simply having to run automated tests. Computer systems cannot offer the same kind of suggestions that a human operator would when utilizing an app because they execute pre-programmed actions rather than thinking independently. Automated tests, for instance, can quickly identify coding errors, but they cannot predict how users will interact with a particular trait or how well users will be able to use the program.
  Users' experiences with a software tool's functionality could be a significant determinant of whether or not additional users embrace the app. This is the kind of data that would come from manual testing. Explorative and user experience testing will require human perceptions, according to application development, because computers "are wonderful at infallible repetition, but much less efficacious at discovering and trying to follow gut instincts." This might make it easier to identify and fix bugs as soon as they occur when users interact with the app in particular ways. 

Testing mobile apps by leveraging a cloud infrastructure is referred to as "cloud-based" mobile application testing. Its examples include utilizing a cloud-based testing environment, testing datasets, and automated test tools. Without having to have any actual devices on hand, the cloud-based mobile application testing process enables testing to be performed on a variety of platforms and devices, including several models of smartphones and tablets.

Mobile application testing can be done on real devices, in simulation environments, or using emulators in a cloud-based mobile application testing process. There are a huge number of devices to test on because they may be found in various geolocations and made accessible in remote locations.

Application performance can be evaluated by running tests in various network environments. To ensure smooth and efficient performance across all types of networks, I verify apps on 2G, 3G, 4G, as well as WIFI networks. Testing mobile apps on various networks is a crucial aspect of testing mobile applications. 

Testing a mobile application in different network environments and connectivity levels helps to identify various issues such as: 

• Latency in data sharing and receiving done by the application 
• Data ingestion capacity of the application at a given time. 
• Data leakage occurs during the transmission process, also known as data packet loss. 
• Variations in latency. 

Despite the fact that businesses are developing mobile applications and reimagining their strategy. Still, a sizable portion of users prefer to use a web device to access websites or web applications as opposed to the mobile application itself. You must therefore incorporate mobile browser testing into your entire test strategy. For instance, despite having a mobile app, many people still use the mobile browser to access Amazon. Users utilize mobile web browsers to access web applications for a variety of reasons, including lack of available app storage capacity and reluctance to grant authorizations. 

When conducting mobile testing, you should keep the following in mind: 

• Different configurations: Any web application ought to function in a variety of mobile web browsers and variants. 
• User experience: Developers must make sure that customer experience is not compromised when using a mobile browser to navigate the app or website. 
• Effective security: Users anticipate safe and secure personal data transfers on mobile websites due to the prevalence of cyberattacks. Therefore, mobile web apps are subjected to end-to-end vulnerability scanning. Data security is ensured by security testing, which assists in locating any dangers and flaws in the app. 
• Compatibility: Since there are now so many different screen sizes and resolutions, it is anticipated that the application will function properly on all devices. To ensure this, fits into the overall should be given top priority. 
• Scalability: When obtained from a mobile browser, a website or app shouldn't crash. It should go through load testing with increasing and decreasing user loads to make sure of this. 
• Localization: When obtained from a mobile browser, an app or website should follow the target nation's or region's provincial settings. In order to make sure the software helps balance the language and cultural facets of a specific region, location testing is necessary. 

The easiest way you can use to test CPU usage on mobile is that both Android and iOS provide an in-built option to monitor the system usage. In order to monitor, you need to go to phone setting and there the mobile phone provides various options to check different kinds of usage by the system. You can access all the information related to CPU usage in the phone settings.

And the other way is by using third-party software built to monitor CPU usage on the mobile phone; You can download the application such as CPU Monitor, CPU Stats, CPU-Z, and other sophisticated tools such as these from either the app store or Google Play, both of which are widely available. These tools keep historical records of the processes which are running on the device.

Without end-to-end testing, you run the risk of your entire application failing if one of those supporting systems breaks. Consider the situation where you are using an online store to buy software. Your procedure may reflect the following from your end-user perspective: 

• Access website 
• Go to the pricing page by clicking through. 
• Put the items you want in your shopping cart and then click "Check out." 
• Go to a payment page and enter your name, credit card number, home address, and phone number. 
• Select "Submit" to complete the purchase.

Below mentioned are the Five metrics that need to be considered before undertaking the sanity check on mobile applications: 

• Verify if the mobile application can perform well as it is intended to across different platforms. 
• Verify if the mobile application can perform well as it is intended to in various network environments and connectivity levels. 
• Check if the mobile application is working well after updates or after installation. 
• Verify if the mobile application allows for background calls or cross app usage functionality. 
• Check if the mobile application is compliant with the media.

One of the notable Qualities of any successful application is that they offer easy-to-use User Interfaces. Therefore usability of the application needs to be verified in order to make it work smoothly across various resolutions and dimensions. Testing a mobile application under different screen resolutions is important to make sure it performs appropriately across various screen sizes, in multi-column layouts, in picture in picture modes, comprehensive table like layouts, and split modes.

The right approach is using emulators for testing applications made for devices with different screen sizes.

By installing and downloading the app, you can verify that it has been started.

Check to see if the mobile application's display can be adjusted to fit the screen of the gadget and if all of the application's menus are operational.

• Make sure the mobile application's text is readable and understandable. 
• Ensure the font sizes are appropriately fitting the screen size of the mobile device. 
• Ensure users can read the sentence and UX content with ease. 

Verify that the software display is flexible and compatible with the different display modes such as portrait and landscape mode and make sure the mobile app is able to seamlessly switch between these modes through both automated and manual modes.

Make sure the app doesn't prevent the other applications on the mobile phone from operating.