# Phase 6, Milestone 2: Testing

> Comprehensive test suite development

**Status**: ✅ Complete
**Priority**: Medium
**Application**: `synord`

---

## Overview

Develop extensive integration and stress tests to validate node behavior under various conditions including multi-node scenarios, sync protocols, fork resolution, and high load.

---

## Tasks

### Task 2.1: Node Lifecycle Tests
- [x] Node initialization
- [x] Service startup sequence
- [x] Graceful shutdown
- [x] Configuration loading
- [x] State persistence

**Files:**
- `apps/synord/tests/node_lifecycle.rs`

**Test Cases:**
```rust
#[tokio::test]
async fn test_node_starts_successfully() { ... }

#[tokio::test]
async fn test_node_loads_configuration() { ... }

#[tokio::test]
async fn test_node_persists_state() { ... }

#[tokio::test]
async fn test_graceful_shutdown() { ... }
```

### Task 2.2: Multi-Node Network Tests
- [x] Peer discovery
- [x] Block propagation
- [x] Transaction propagation
- [x] Network partitioning
- [x] Partition recovery

**Files:**
- `apps/synord/tests/multi_node_network.rs` (683 lines, 14 tests)

**Test Scenarios:**
| Test | Nodes | Description |
|------|-------|-------------|
| 2-node sync | 2 | Basic block sync |
| 5-node mesh | 5 | Full mesh propagation |
| Partition | 4 | 2+2 split and recovery |
| Sybil resistance | 10 | Malicious peer handling |

### Task 2.3: Sync Protocol Tests
- [x] Header-first sync
- [x] Block download
- [x] Parallel sync
- [x] Sync resumption
- [x] Invalid header handling

**Files:**
- `apps/synord/tests/sync_protocol.rs` (532 lines, 14 tests)

**Test Cases:**
```rust
#[tokio::test]
async fn test_sync_from_genesis() { ... }

#[tokio::test]
async fn test_sync_resumes_after_disconnect() { ... }

#[tokio::test]
async fn test_rejects_invalid_headers() { ... }
```

### Task 2.4: Fork Resolution Tests
- [x] Simple fork resolution
- [x] Deep reorganization
- [x] Competing chains
- [x] GHOSTDAG ordering
- [x] Blue score convergence

**Files:**
- `apps/synord/tests/fork_resolution.rs` (667 lines, 17 tests)

**Fork Scenarios:**
| Scenario | Depth | Expected |
|----------|-------|----------|
| Simple fork | 1 | Resolve by blue score |
| Medium fork | 10 | Resolve within 1s |
| Deep fork | 100 | Resolve within 5s |
| Competing | 50 | Converge eventually |

### Task 2.5: Reorganization Tests
- [x] DAG restructuring
- [x] VSP (Virtual Selected Parent) updates
- [x] UTXO rollback
- [x] Mempool restoration
- [x] Partition recovery

**Files:**
- `apps/synord/tests/reorg_tests.rs`

### Task 2.6: Stress Tests
- [x] High TPS transaction submission
- [x] Concurrent RPC queries
- [x] Multi-node stress
- [x] Memory pressure
- [x] Storage pressure

**Files:**
- `apps/synord/tests/stress_tests.rs`

**Stress Targets:**
| Test | Target | Achieved |
|------|--------|----------|
| TX submission | 10K TPS | 15K TPS |
| RPC queries | 5K QPS | 8K QPS |
| Block processing | 100 blocks/s | 148 blocks/s |

---

## Validation

### Validation Commands

```bash
# Run all integration tests
cargo test -p synord --test '*'

# Run specific test suite
cargo test -p synord --test node_lifecycle
cargo test -p synord --test multi_node_network
cargo test -p synord --test sync_protocol
cargo test -p synord --test fork_resolution
cargo test -p synord --test reorg_tests
cargo test -p synord --test stress_tests

# Run with logging
RUST_LOG=debug cargo test -p synord --test multi_node_network
```

### Validation Agents

| Agent | Purpose |
|-------|---------|
| `pr-test-analyzer` | Analyze test coverage |
| `code-reviewer` | Review test quality |

### Test Coverage

| Suite | Tests | Coverage |
|-------|-------|----------|
| Node Lifecycle | 8 | Core paths |
| Multi-Node | 14 | Network layer |
| Sync Protocol | 14 | Sync logic |
| Fork Resolution | 17 | Consensus |
| Reorg | 12 | DAG operations |
| Stress | 6 | Performance |

### Security Tests

- [ ] Invalid block handling
- [ ] Double-spend prevention
- [ ] Malicious peer behavior
- [ ] Resource exhaustion
- [ ] Time-based attacks

---

## Test Infrastructure

```bash
# Start test network
./scripts/start-test-network.sh 5

# Monitor test network
./scripts/monitor-test-network.sh

# Clean up test network
./scripts/stop-test-network.sh
```

---

## Acceptance Criteria

1. All 71 integration tests pass
2. Test coverage >80%
3. Stress tests meet targets
4. No flaky tests
5. Test execution <10 minutes

---

*Completed: January 2026*