API and Service Testing Questions

Testing strategies for APIs and services operating at scale. Covers the test pyramid and the balance between unit, API, integration, and end to end tests; consumer driven contract testing and contract verification; mocking and stubbing dependent services in CI and local testing; strategies to keep tests fast and reliable in microservices environments; test data management, versioning-aware tests, performance and load testing for APIs, and integrating tests into continuous integration and deployment pipelines.