Universal Layered Testing Strategy

Description

This Skill generates a complete layered testing strategy based on project type (Backend+APP / Backend+WEB / Backend+APP+Embedded), including test layer architecture, scenario adaptation matrices, code templates, and CI/CD configuration.

Core philosophy: "Quality is built in, not tested in."

Two Key Principles

1. Shift Left: Developers write L1/L2 tests during coding — the earlier bugs are found, the lower the fix cost
2. Push Down: If it can be tested at L1, don't leave it for L2; if it can be tested at L2, don't leave it for L3

Ideal Test Pyramid Proportions