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A Guide to iOS Application Testing

iOS App Testing - A Comprehensive Guide

July 18, 2023
 by 
Midhun MathewMidhun Mathew
Midhun Mathew

In the competitive landscape of the digital era, delivering a flawless iOS application is of paramount importance. iOS app testing, a crucial phase of app development, ensures top-tier quality, functionality, and user experience. This process incorporates various test types, tools, and strategic methodologies tailored specifically for the iOS platform. Being well-versed in iOS application testing equips developers with the confidence to navigate this intricate landscape effectively. It's more than just detecting bugs; it's about maintaining a brand's reputation, enhancing user satisfaction, and, ultimately, steering the course toward the application's success.

What iOS application testing?

iOS app testing is a process that evaluates an application's performance, functionality, usability, and security on devices running Apple's iOS operating system. It helps identify and resolve potential issues before the app is released, hence ensuring a high-quality user experience and minimizing the risk of negative reviews or user dissatisfaction. This can involve testing on actual devices or using simulators and can be performed manually or with iOS app automation testing tools. For improved results, testing and QA teams are also shifting their priorities to automation. iOS app test automation frameworks enable testers to automate various aspects of iOS app testing, including UI testing, performance testing, and integration testing. 

Why are enterprises prioritizing iOS apps today?

Enterprises are prioritizing iOS app testing today because of the significant market share that Apple holds, especially in lucrative markets. Ensuring an optimal user experience on iOS devices is crucial for millions of users worldwide. Furthermore, iOS users are typically considered more engaged and likely to spend more on apps. Hence, enterprises can't afford to ignore the performance and functionality of their apps on this platform. By conducting thorough iOS application testing, they can identify and fix any issues, thus preventing negative reviews that could impact their reputation and revenue. Additionally, the standardization of iOS devices allows for easier testing processes compared to the fragmented Android market.

Why has iOS mobile app testing seen a sudden surge?

iOS mobile app testing is vital today owing to the ubiquity of mobile devices and the critical role apps play in our daily lives. Here's why:

High user expectations: iOS users demand high-quality, seamless experiences. To meet these expectations, apps must function flawlessly and intuitively, which requires thorough testing.

  • iOS market share: Though Android holds the majority of the global market, iOS dominates in affluent markets like the US and Western Europe. These high-value customers expect top-tier apps.
  • Device and OS fragmentation: The variety of iOS devices (iPhone, iPad, iPod Touch) and operating system versions in use necessitates comprehensive testing to ensure broad compatibility. Also, by automating the testing process, iOS app testers can streamline their efforts and execute test cases across multiple devices and OS versions simultaneously. Thus, iOS app test automation further helps deliver a consistent user experience and maximizes app compatibility across the fragmented iOS ecosystem.
  • Security: iOS is renowned for its stringent security measures. Rigorous testing helps developers meet these standards, safeguard user data, and uphold the platform's reputation.
  • Monetization: For developers, the iOS user base is often more lucrative than its Android counterpart. High-quality, well-tested apps lead to more downloads, in-app purchases, and ad revenues.
Test your apps on real iOS devices and say no to emulators to deliver perfect digital experiences.
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Read: Android vs. iOS App Performance Testing - How are These Different?

What are the benefits of iOS app testing?

Effectively performing iOS application testing is critical to the health of any iOS app and optimal end-user satisfaction. The primary benefits of testing iOS apps include:

  • Ensuring optimal user experience: iOS application testing is crucial in delivering an optimal user experience. As Apple users expect high-quality apps with minimal bugs, it's essential to extensively test iOS apps to meet these expectations. This testing ensures the application is user-friendly, intuitive, and free from glitches that could hamper user experience. 
  • Preserving brand reputation: With an iOS app representing the company to its users, any flaws could tarnish the brand image. iOS application testing helps preserve a brand's reputation by detecting and rectifying defects before they reach the end user. 
  • Compatibility testing: The array of Apple devices on the market, from different iPhone models to iPads, means that your application needs to function seamlessly across all devices. Compatibility testing is, therefore, a critical aspect of iOS app testing. 
  • Security assurance: Given the sensitive nature of data often handled by apps, security is paramount. Testing ensures the application is secure from threats and vulnerabilities, which is crucial for iOS apps due to Apple's strict security guidelines. 
  • Performance validation: Performance testing helps determine the app's performance under varying conditions, like network changes or high user loads. Ensuring the app can withstand peak loads while maintaining its functionality and speed is essential.
  • Adherence to Apple's guidelines: Apple has strict guidelines for applications to be allowed in its App Store. iOS application testing helps ensure that the application adheres to these guidelines, increasing the chances of app approval during the review process.
Also read: A Comprehensive Guide to Choosing Between Appium and XCTest (UI) for iOS App Testing

What are the different methods of testing involved in iOS application testing?

iOS application testing entails a variety of testing types, each targeting different aspects of an app's performance, usability, and functionality. These tests are crucial in creating a robust, reliable, and user-friendly application that performs seamlessly across different devices and network conditions. Here are some key types of iOS app testing that developers employ to ensure their app's quality and performance:

  • Unit testing: An indispensable part of iOS application testing, Unit testing ensures that individual units, whether methods, functions, or procedures, within the application, perform as expected. By isolating each unit, developers can detect and rectify flaws early, streamlining bug fixing, and making future changes more manageable.
  • Integration testing: Once each component is tested, Integration testing comes into play. It validates the interaction between different units of the application, identifying issues related to data exchange, mismatched interfaces, or miscommunications. This step ensures the various parts of your app can work together seamlessly.
  • Functional testing: Functional testing aims to confirm that the app's functionalities align with the provided input and expected output. It's like a practical test drive, checking the application's actions, whether it's user log-in or content sharing, ensuring the end-user gets what they're supposed to.
  • Performance testing: This testing type gauges how the app performs under varied conditions. Performance testing covers everything from the application's response time to its speed, stability, and reliability under different network conditions, device types, and user loads. This is vital for keeping the user experience smooth and uninterrupted.
  • Security testing: In today's digital age, the security of an app is paramount. Security testing acts as the application's security guard, ensuring it's free from vulnerabilities that malicious entities could exploit. It checks for data breaches, unauthorized access, and other potential threats to user privacy.
  • User interface (UI) testing: UI testing focuses on the app's visual elements, scrutinizing buttons, icons, images, text, alignment, and overall aesthetics. A well-performing app with a poorly designed interface may fail to engage users. Therefore, verifying that all elements function correctly and deliver a pleasing and intuitive user experience is essential.
  • Usability testing: Usability testing is a reality check on whether the application is user-friendly and intuitive. This involves actual users navigating the app, giving developers direct insights into areas of improvement, and offering a better understanding of how users interact with the app.
  • Compatibility testing: With the wide array of devices and operating system versions in the market, Compatibility testing is vital. It ensures that your app performs consistently across different platforms, network environments, and screen sizes, enabling you to reach a broader audience.
  • Beta testing: Lastly, beta testing serves as a real-world litmus test before the application's final launch. The application is released to a limited number of users to gain practical feedback, helping developers make necessary adjustments to fine-tune the app to its best version.

What is the importance of manual and automated testing for iOS apps? 

In the realm of iOS app testing, manual and automated testing each has its unique strengths, addressing distinct facets of app performance and functionality, creating a comprehensive testing framework when combined.

Manual testing, a hands-on process, involves testers individually executing test cases without utilizing any iOS app automation testing tools. It plays an indispensable role in iOS application testing. With manual testing, testers can replicate real-world user experiences and monitor the app's behavior under various conditions and use cases. This form of testing is especially crucial in spotting UI/UX issues and layout difficulties and validating app behavior under less predictable or unexpected conditions. The human touch in manual testing allows for a nuanced understanding of the usability problems that may evade automated iOS app testing.

Meanwhile, iOS app test automation employs software tools to run tests and subsequently compares the actual results against the expected outcomes. This mode of testing is incredibly effective for repetitive tasks, as well as regression tests, allowing for significant time and effort savings. It proves particularly advantageous in areas such as performance testing, load testing, and stress testing, where manually executing a multitude of tasks could be time-consuming and error-prone. Automation's capacity for continuous testing and integration in the development process makes it essential to agile and DevOps practices.

By amalgamating manual and automated iOS app testing, comprehensive coverage of all test scenarios can be ensured. This synergy makes for a more robust and reliable iOS app that delivers a superior user experience. Manual testing contributes to the human perspective, capturing the nuances and idiosyncrasies of human interaction, while iOS app automation testing contributes to speed and efficiency. Together, they form a well-rounded and efficient approach to iOS application testing.

Check: Retrieving Clipboard Text from a Real iOS Device

Testing iOS apps on different devices

Testing iOS applications across a variety of devices - simulators, emulators, and real devices such as iPhones, iPads, and MacBooks - is an integral part of ensuring app quality and functionality. Each testing method offers its unique benefits, and utilizing a blend of these can lead to comprehensive testing coverage. 

  • Simulators: iOS Simulators, which are part of Xcode, the iOS SDK, offer a simple and cost-effective way to run tests quickly. These software programs simulate the iOS environment on your development machine, allowing developers to execute and test their applications swiftly. Simulators provide a high degree of control, letting developers easily tweak the environment to test various scenarios. However, it's important to remember that simulators run on Mac hardware, not iPhone or iPad chipset; hence, they may not accurately represent device-specific features and hardware interactions.
  • Emulators: Like simulators, emulators mimic the software and hardware environment of an iOS device on a different platform. The key distinction is that while a simulator fakes the device's software, an emulator replicates both the software and underlying hardware. This level of imitation makes emulators a powerful tool for debugging and testing lower-level software interactions, including the app's influence on battery life or CPU usage. However, emulators often run slower than simulators as they attempt to mimic hardware properties.
  • Real Devices: While simulators and emulators play a valuable role in the initial testing phases, testing on real devices is essential before the final app deployment. Real device testing means running tests on actual devices - iPhones, iPads, or MacBooks - to get a realistic understanding of how an app behaves and performs in a real-world scenario. Testing on real devices precisely represents user environments, interaction modes, device-specific features, and hardware utilization. It allows for the accurate testing of factors such as performance, battery consumption, sensors, and gestures - elements that are often not replicated entirely accurately on simulators or emulators.

Testing on iPhones

iPhone app testing is crucial due to the extensive use of iOS devices globally. iPhones come in different models, each with unique features, screen sizes, and operating system versions. iPhone app testing across multiple iPhone models ensures that it works correctly regardless of the user's iPhone model. It's important to consider the variations in processing power, screen resolution, form factors, and specific hardware features like haptic touch and face ID.

● Testing on iPads

Testing on iPads is also essential, given their wide usage for media consumption, productivity tasks, and even gaming. iPads come with larger screen sizes and unique features such as split-screen multitasking, which might impact the app's user interface and functionality. Testing should ensure that your app can adjust to these unique factors without compromising the user experience.

● Using a combination of devices

For a comprehensive and effective iOS app testing strategy, employing a combination of emulators, simulators, and real devices is essential. While emulators and simulators provide a high degree of convenience, they can never perfectly replicate the complexities of a real-world device. This is where real device testing steps in. Testing on real devices provides the most accurate representation of how an app will function in a user's hands. It allows testers to interact with the app as a user would, providing vital insights into the user experience. Also, real devices can help uncover issues related to battery usage, performance under various network conditions, sensors' usage, and more.

Also check: Maximizing Efficiency with Inspect Element on iPhone

Cross browser testing for iOS apps

Performing iOS browser testing that involves checking how well your app works on a specific browser on an iOS device is critical. It verifies the layout, response time, functionality, and other aspects on that particular browser. However, with the wide range of platforms in the market today, testing the app's performance across different browsers is crucial for the success of the app. It involves assessing the functionality and compatibility of your app across various web browsers on iOS devices. As users can access your app via different browsers like Safari, Chrome, or Firefox on their iPhones or iPads, ensuring a consistent user experience across all these browsers is crucial.

Cross-browser testing checks elements like layout, design, response, functionality, and performance on multiple browsers. This testing helps to identify any browser-specific issues, thus helping in optimizing the app to provide a uniform experience.

Creating a strategy for effective iOS app testing

The planning phase is crucial in the process of iOS application testing to ensure a comprehensive and effective strategy. A well-devised strategy should include several critical aspects:

  • Understand the application: Before initiating the testing phase, you need to understand the application's functionality, target audience, key features, and usage scenarios. Understanding these elements can help to structure the testing process more effectively.
  • Define the scope of testing: It's essential to determine the scope of testing by listing what needs to be tested and what does not. This includes deciding on the types of testing required, like functional, performance, usability, security, and so on, based on the nature of the app.
  • Device and OS selection: With various iOS devices available in the market and several versions of the operating system, it's necessary to identify which devices and OS versions your app will support and therefore need to be included in your testing.
  • Automated vs. manual testing: Manual and Automated iOS app testing both have their benefits. A strategy needs to be devised that leverages the advantages of both, taking into account factors like budget, timeline, and the complexity of the app.
  • Real device and simulator testing: While simulators can be a cost-effective way to carry out initial tests, real device testing is crucial for understanding the actual user experience. A good strategy will ensure a balance between the two.
  • Performance metrics: Identify which Key Performance Indicators (KPIs) are important for your app and ensure these are being monitored during the testing phase.
  • Iterative testing: An effective testing strategy should be iterative, with continuous testing and bug fixing throughout the app development process.
  • Review and adherence to app store guidelines: Lastly, ensure that your app aligns with Apple's App Store guidelines. Non-compliance could lead to the rejection of your app.

By carefully strategizing your iOS app testing phase, you will be better positioned to deliver a robust and user-friendly app that can meet or exceed user expectations.

Simplify iOS app automation testing across the latest iOS versions and identify performance issues to enhance the app experiences for users.
Leverage a reliable global device infrastructure
Also check: A Complete Guide to User Experience Testing

How does HeadSpin enable enterprises to perform iOS app testing?

HeadSpin offers a data science driven testing Platform to allow remote testing and debugging of mobile, web, and video apps on iOS devices worldwide to deliver perfect user experiences. With its extensive, globally-distributed device cloud, HeadSpin gives access to a multitude of real iOS devices, including various models of iPhones, iPads, and MacBooks, capturing the true user experience.

The critical HeadSpin features that streamline iOS app testing

1. Capturing vital KPIs for performance monitoring: HeadSpin's platform plays a crucial role in capturing vital Key Performance Indicators (KPIs) during iOS app testing. It provides comprehensive data science capabilities that help monitor various custom KPIs that impact app performance and user experience, from network metrics and server response times to user interface responsiveness and device resource usage.

2. Identifying performance issues: HeadSpin's platform offers an unparalleled view into the performance of your app by diagnosing issues at every level, including server, CDN, network, and device. By focusing on these critical areas, HeadSpin helps identify potential bottlenecks and fine-tune the app for optimal performance.

3. Obtaining logs for root cause analysis: HeadSpin offers effective iOS test automation tools that help capture detailed logs and metrics for the testing workflows, such as memory and battery usage. Testers and QA teams can leverage root cause analysis and replicate issues with videos, screenshots, user interactions, and script execution results.

4. Eliminating emulators with HeadSpin: HeadSpin delivers an optimal solution for thorough and regular iOS app performance testing. It grants access to actual devices like iPhone, iPad, and MacBook in the cloud across various models and iOS versions. This access supports full gesture compatibility, eliminating the need for an iOS emulator.

5. Improved test automation coverage: HeadSpin's sophisticated continuous testing tools boost your iOS testing automation coverage. It helps testing and QA teams automate the testing of unique UI elements, integrated third-party apps, and built-in SDK parts without jailbreaking the phone. This also includes conducting integration tests with essential iOS system apps and device components, like Maps, Safari, Siri, or Touch ID.

6. Performing cross browser testing: HeadSpin makes cross-browser testing on iOS devices simple and efficient. It offers a wide range of real iOS devices with different versions of browsers for comprehensive testing. With their global device cloud, testers are able to access these devices remotely from anywhere in the world, enabling a thorough and effective cross-browser testing process.

7. Remote debugging: HeadSpin provides real-time access to devices in the global device cloud, allowing you to interact with them as if they were physically in your hands. This makes troubleshooting more efficient as you can detect, diagnose, and fix issues directly on the remote device, reducing the need for repeated test cycles. Moreover, the Platform helps capture network logs, system logs, and video sessions for a detailed analysis, enabling a more comprehensive debugging experience.

8. Run parallel tests on multiple iOS devices: With HeadSpin, you can set up continuous integration for around-the-clock testing. It enables simultaneous unit and white-box testing on multiple iOS devices, optimizing the testing process and enhancing efficiency.

9. Biometric testing in iOS apps: With the release of iOS 8.0, Apple incorporated biometric authentication features like Touch ID, and later with iOS 11.0, introduced Face ID to provide secure and streamlined user authentication. However, testing these biometric processes can be challenging due to the requirement of physical interaction with the device, like using a fingerprint sensor for Touch ID or a depth camera for Face ID. To overcome this challenge, HeadSpin provides a biometric instrumentation SDK that can be smoothly integrated into your app's codebase. This works in tandem with HeadSpin's API endpoints and remote control web UI, helping to automate biometric tests. This solution simplifies the testing process, allowing for thorough validation of these critical security features.

Read: A Comprehensive Guide to Efficiently Writing and Implementing iOS Unit Tests

Bottom line

In a world where digital experiences are paramount, iOS app testing emerges as a non-negotiable process for businesses striving for app excellence. It paves the way for enhanced user experiences, increased revenue streams, and a notable market presence. HeadSpin, as a leading player in the mobile performance testing landscape, offers a seamless and comprehensive testing platform for iOS apps. With its cutting-edge features, HeadSpin enables businesses to detect and rectify performance bottlenecks, understand user experience across geographies, and ensure robust, high-performing apps on a multitude of iOS devices. By leveraging iOS app testing and HeadSpin's advanced tools, businesses are equipped to deliver top-tier iOS apps that delight users and drive success in today's competitive digital landscape.

Frequently Asked Questions

Q1. What is the significance of continuous integration (CI) in iOS app testing?

Ans: Continuous integration is a software development practice where developers regularly merge their changes to the main codebase. In iOS app testing, it helps to detect and address bugs quicker, improve app quality, and reduce the time to validate new updates and release them.

Q2. How is memory leak detection performed in iOS app testing?

Ans: Memory leak detection in iOS app testing is usually performed using tools like Instruments in Xcode. These tools track memory allocation and can help pinpoint locations in the code where memory is being improperly managed.

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