Explain the Test Pyramid and how it guides testing strategy
WHAT IT TESTS: Your grasp of test cost, speed, and brittleness by layer. ANSWER OUTLINE: Favor fast unit tests, a middle service layer, and few UI tests as second defense. RED FLAG: Treating it as a fixed ratio or saying all end-to-end tests need a.
WHAT IT TESTS: Whether you understand the economic and reliability trade-offs between focused unit tests, service-layer integration tests, and broad UI tests. ANSWER OUTLINE: A strong answer maps the pyramid to speed and brittleness: many isolated unit tests for logic, a middle band of subcutaneous or API tests, and a thin cap of UI tests as a second line of defense. It also notes that high-level failures imply missing unit tests.
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