Design automated regression tests for an API
Company: TikTok
Role: Software Engineer
Category: Software Engineering Fundamentals
Difficulty: easy
Interview Round: Technical Screen
## Scenario
A team is launching a **new RESTful API** (or a new version of an existing API). You are responsible for designing an **automated regression test suite** and for validating/monitoring **performance improvements** over time.
## Questions
1. How would you design an **automated regression test suite** for the RESTful API? What major domains would you ensure are covered?
2. As QA, what tests would you design to **verify performance improvements** and how would you **continuously monitor** that performance in production?
3. If you had to create an **end-to-end (E2E) test plan** for your own full-stack project, how would you structure the plan (layers, environments, data, CI)?
4. From a QA perspective, what are the **main benefits** and **limitations** of aiming for very high test coverage?
Quick Answer: This question evaluates proficiency in designing automated regression test suites for RESTful APIs, performance verification and monitoring, end-to-end test planning, and understanding trade-offs in test coverage within QA and software engineering.