What does white box testing involve?

White box testing involves a deep understanding of the internal workings of a system. This type of testing is focused on examining the internal structure, logic, and algorithms that make up the application. By utilizing this knowledge, testers can create test cases that effectively evaluate the flow of inputs through the system and check for specific outputs based on the expected behavior defined in the internal code.

This approach allows testers to identify hidden errors in the code, validate the correct implementation of algorithms, and ensure that all logical paths are executed during the testing process. It contrasts with other testing methodologies where understanding the internal mechanisms of the application is not a requirement, focusing instead on how the end-user interacts with the application or on external specifications. Thus, the emphasis on internal logic and algorithms is what makes white box testing distinctly valuable for ensuring software integrity and quality.