Functional testing is a crucial phase in the mobile app development process, ensuring that an application’s features operate as intended and meet the specified requirements. In essence, it is the examination of a mobile app’s functions to confirm that they perform correctly and deliver the expected results. 

This testing approach evaluates the app’s functionalities, user interface, APIs, databases, security measures, client/server applications (see the related concepts Front-end development and Back-end development), and overall system interactions.

Ultimately, functional testing supplements other forms of testing to ensure that apps meet client and user requirements or preferences. Conversely, the absence of functional testing can lead to a waste of resources for app developers, businesses, and other organizations depending on apps for long-term growth. 

How functional testing benefits developers

For mobile app developers, functional testing serves as a quality assurance mechanism, helping identify and rectify defects or issues before the app reaches the hands of end-users. By systematically testing each feature and component, developers can ensure that the app works as intended and delivers a seamless and satisfying user experience. This ultimately leads to apps succeeding as growth engines.

How functional testing benefits entities and institutions

Functional testing also positively impacts entrepreneurs, companies, and nonprofits that rely on mobile apps for financial sustainability. Here’s how:

• Enhanced user experience. Functional testing guarantees that users encounter a reliable and bug-free application. This, in turn, boosts user satisfaction, app retention rates, and positive reviews, contributing to the app’s popularity and success in the competitive market. The success story of Grill’d attests to how functional testing leads to more satisfied users.
• Increased revenue streams. Apps laden with bugs or malfunctions often lead to negative user reviews and uninstallations. Functional testing mitigates this risk, preserving a positive brand image and encouraging user trust. Satisfied users are more likely to engage with in-app purchases, premium features, or subscription models, directly impacting the app’s revenue streams.
• Time and cost savings. Detecting and fixing issues early in the development process is more cost-effective than addressing them after the app’s release. Functional testing minimizes the likelihood of post-release glitches, reducing the need for emergency updates and patches. This efficiency translates into both time and cost savings for the development team and the organization as a whole.

See also Beta Testing and User Acceptance Testing