Certified Associate in Software Testing (CAST) Practice Test

What type of testing is based on knowledge of internal code structure?

1. Black Box Testing

2. White Box Testing

3. Functional Testing

4. Performance Testing

The correct answer is: White Box Testing

White box testing is a testing methodology that requires knowledge of the internal code structure, design, and implementation of the software being tested. This approach allows testers to create test cases based on the internal workings of the application, such as the flow of control, data connections, and specific logic paths. By understanding how the code functions, testers can design tests that cover various conditions and loops within the software, ensuring that all pathways are executed and the logic behaves as expected. This level of insight not only helps in finding logical errors and failures but also verifies that all parts of the code have been adequately tested. In contrast, black box testing focuses solely on the outputs generated in response to various inputs, without any consideration for how those outputs are produced internally. Functional testing assesses the software against functional requirements without examining internal code structures. Similarly, performance testing evaluates the speed, scalability, and stability aspects of the software rather than its internal construction. Therefore, white box testing stands out as the only approach that involves a deep understanding of the internal code structure.