API Testing Concepts Questions

Principles and practices for validating application programming interfaces. Topics include verifying correct use of request methods, expected status codes and error responses, response payload validation and schema checks, authentication and authorization for interfaces, rate limiting and idempotency, transactional behavior and data consistency across services. Candidates should be able to discuss contract testing between services, mocking and stubbing dependent services for reliable test runs, security considerations for interfaces, and performance and load testing of interfaces. Describe how to automate interface tests within the continuous integration pipeline and how to combine manual exploration with automated verification using relevant tooling.