What is the primary goal of white-box testing?

• A. Test internal structures or workings of an application
• B. Test external user interfaces
• C. Test system performance under peak load
• D. Test compatibility with old software

Answer: (A)

White-box testing aims to validate the internal structure, logic, and implementation of a program. Since testers have access to the source code, tests are designed to exercise specific code paths, branches, and data flows to confirm the software behaves as intended. This approach uncover issues like dead code, unreachable paths, logical errors, and不足 proper input validation that wouldn’t be obvious from the outside. Techniques include unit testing and code coverage analysis (statement, branch, path) to ensure every part of the internal logic works correctly. For example, tests would cover both branches of conditionals, check boundary values, and verify proper error handling. Other testing types focus on external behavior, performance, or compatibility, which aren’t the primary focus of white-box testing.