API Testing and Validation Questions

Design and implement tests for application programming interfaces, including validation of request and response payloads, schema and contract verification, parameter and field validation, and boundary and negative tests. Cover authentication and authorization checks, idempotency verification, rate limiting and throttling behavior, and security checks such as injection and cross site scripting. Discuss trade offs between isolated tests, contract testing, and full end to end integration tests, strategies for test data management and mocking, and how application programming interface tests are automated and integrated into continuous integration and continuous delivery pipelines and monitoring.