TDD-0001: Template
| Metadata | Value |
|---|
| Status | Draft | In Review | Approved | In Progress | Complete |
| Created | YYYY-MM-DD |
| Author(s) | @username |
| RFC | RFC-NNNN (if applicable) |
| Epic/Ticket | PROJ-123 |
Context
Link to the RFC (if any) and provide a brief summary of what we’re building and why.
Background
Technical context needed to understand this design.
Problem Summary
One paragraph recap of the problem from the RFC.
Requirements
Functional Requirements
| ID | Requirement | Priority |
|---|
| FR-1 | … | Must |
| FR-2 | … | Should |
| FR-3 | … | Could |
Non-Functional Requirements
| Category | Requirement | Target |
|---|
| Performance | Response time | < 200ms p99 |
| Reliability | Uptime | 99.9% |
| Scalability | Concurrent users | 1000+ |
| Maintainability | Test coverage | > 80% |
Proposed Architecture
System Overview
High-level diagram showing components and their interactions.
flowchart TB
A[Component A] --> B[Component B]
B --> C[Component C]
Components Involved
| Component | Responsibility | Changes Required |
|---|
| Component A | … | New / Modified / None |
| Component B | … | New / Modified / None |
Key Dependencies
| Dependency | Version | Purpose |
|---|
| Library X | ^2.0.0 | … |
| Service Y | v1 API | … |
Failure Modes
| Failure | Impact | Mitigation |
|---|
| Service Y unavailable | … | Circuit breaker, fallback |
| Database timeout | … | Retry with backoff |
Interfaces
API Endpoints
GET /api/resource
POST /api/resource
PUT /api/resource/:id
Data Contracts
Request/response schemas, event payloads.
{
"field": "type",
"nested": {
"property": "value"
}
}
Events (if applicable)
| Event | Trigger | Payload | Consumers |
|---|
resource.created | POST success | { id, ... } | Service Z |
Implementation Plan
Phase 1: Foundation
| Task | Owner | Estimate | Dependencies |
|---|
| Task 1 | @dev | 2d | None |
| Task 2 | @dev | 3d | Task 1 |
Phase 2: Core Features
| Task | Owner | Estimate | Dependencies |
|---|
| Task 3 | @dev | 5d | Phase 1 |
| Task 4 | @dev | 3d | Task 3 |
Phase 3: Polish & Launch
| Task | Owner | Estimate | Dependencies |
|---|
| Task 5 | @dev | 2d | Phase 2 |
Testing Plan
Unit Tests
What components/functions will have unit tests? Target coverage?
Integration Tests
What integrations will be tested? Test environment setup?
End-to-End Tests
Critical user flows to cover. Test data requirements.
Load testing approach, benchmarks, tools.
Operational Plan
Observability
| Type | Implementation |
|---|
| Logs | Structured JSON, correlation IDs |
| Metrics | Request rate, latency, error rate |
| Traces | Distributed tracing with context propagation |
Alerts
| Alert | Condition | Severity | Runbook |
|---|
| High error rate | > 1% errors/5min | P1 | Link |
| Latency spike | p99 > 500ms | P2 | Link |
Runbook Notes
Key operational procedures, common issues, debugging tips.
Risks & Mitigations
| Risk | Likelihood | Impact | Mitigation |
|---|
| Risk 1 | Medium | High | Mitigation strategy |
| Risk 2 | Low | Medium | Mitigation strategy |
Out of Scope
Explicitly list what this TDD does NOT cover.
- Out of scope item 1
- Out of scope item 2
References