What is one of the principles of API test design?

• A. Setup of user interfaces
• B. Execution of the test scenarios
• C. Only verification of user input
• D. Random testing without structure

Answer: (B)

The principle of API test design focuses on the systematic approach to executing test scenarios. This means that a well-structured set of test cases is created to validate the behavior of the API against its intended functions and specifications.

Execution of test scenarios allows testers to simulate various conditions and inputs, ensuring that the API responds correctly under a range of circumstances. This structured execution can identify edge cases, performance issues, and security vulnerabilities, which are crucial for maintaining the integrity of the API.

In contrast, other options do not align with the core principles of API test design. Setting up user interfaces pertains more to UI testing rather than API testing, while verifying only user input suggests a narrow focus that overlooks broader functional and structural testing needs. Random testing without structure lacks the methodology necessary to provide reliable results and can lead to missing critical issues that need to be addressed. Therefore, executing well-defined test scenarios is essential for effective API testing.