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Engineering: backend-engineering, frontend-engineering, data-engineering, ml-engineering, platform-engineering, qa-methodology Executive: go-to-market, legal-strategy, operational-design, org-design, product-strategy ml-engineering: added missing training-infrastructure.md reference qa-methodology: added test-data-management, performance-testing, security-testing references All frontmatter converted to agent-skills convention. Source: https://github.com/magnus919/hermes-profiles
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1.7 KiB
Test Strategy Design
Test Pyramid
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╱ E2E ╲ Few — critical user journeys
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╱ ╲
╱ Integration ╲ Some — contract tests, API tests, service boundaries
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╱ Unit / Component ╲ Many — isolated, fast, deterministic
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| Level | Speed | Cost to maintain | What it catches |
|---|---|---|---|
| Unit | ms | Low | Logic errors, edge cases, invariants |
| Integration | seconds | Medium | Contract mismatches, data flow errors |
| E2E | minutes | High | System behavior, user-visible regressions |
Risk-Based Prioritization
| Risk Level | Test Coverage Required | Example |
|---|---|---|
| Critical (P0) | 100% — every path, every edge case | Payment processing, auth, data integrity |
| High (P1) | 90%+ — all happy paths, known failure modes | Core business logic, API contracts |
| Medium (P2) | 70%+ — happy paths, common failure modes | Secondary features, non-critical APIs |
| Low (P3) | Smoke test only | UI polish, optional features, debug tooling |
Test Selection by Project Type
| Project Type | Recommended Test Mix |
|---|---|
| Library / SDK | 80% unit, 15% integration, 5% E2E |
| Web API | 40% unit, 40% integration, 20% E2E |
| Web application | 30% unit, 40% integration, 30% E2E |
| CLI tool | 60% unit, 30% integration (output comparison), 10% E2E |
| Data pipeline | 50% unit, 40% integration (data flow), 10% E2E |