What is the focus of white-box testing?

The focus of white-box testing is indeed on the internal logic and implementation of the application. This testing approach requires a thorough understanding of the internal workings of the software, including the code structure, algorithms, and control flows. Testers analyze the internal state of the application, allowing them to verify the correctness of each code path, assess logic branches, and ensure that all possible paths have been tested.

By concentrating on the internal components, white-box testing helps identify hidden errors, code vulnerabilities, and bugs that may not be apparent through black-box testing, which only considers the application's external interface. This type of testing also enables the writing of more targeted test cases that can improve code quality and provide better coverage of the software application's functionality.

Focusing on the internal logic also makes it possible to optimize the code, improve code maintainability, and verify that the software behaves as intended from a programmer's perspective, which is essential for building robust applications.