What is the focus of data flow coverage in testing?

Data flow coverage in testing concentrates on ensuring that every feasible path that data can take through a system is executed at least once during the testing process. This approach is essential for validating the integrity and correctness of the data handling within applications. By executing these data flows, testers can identify potential issues related to data management, such as improper data handling, missed edge cases, or logical errors affecting data processing.

This focus on executing each feasible data flow allows for a more thorough examination of how data is manipulated across different components of the system, ultimately contributing to enhanced reliability and performance. It ensures that not only is the application functioning as described, but it also handles data appropriately under various scenarios, which is critical for maintaining the application's overall security and integrity.