A useful test pyramid is a portfolio, not a naming contest

Small tests can isolate behavior and return feedback quickly. Integration tests check boundaries with databases or other services. A smaller set of end-to-end tests checks complete paths, where failures can be slower to reproduce and harder to locate.

Vocke warns against taking the original pyramid’s layer names too literally. A user-interface component can have a small unit test; a test’s scope matters more than whether its name contains UI or service.

The guide develops examples and discusses contract tests, exploratory testing, and duplication. Its central design problem is choosing where each behavior should be verified. Repeating the same assertion at every level adds maintenance without necessarily adding equivalent confidence, while leaving an integration boundary untested creates a different kind of blind spot.