Add comprehensive test strategy for persistent streaming implementation

[z0rzbat3]

Comprehensive Test Strategy for Persistent Streaming Implementation

Test Architecture Framework

1. Unit Tests (Vitest)

Priority: Critical

TC-UT-001: WebSocket Connection Management

describe('WebSocketConnectionManager', () => {
  it('should establish connection successfully', async () => {
    // Test connection establishment
  });
  
  it('should handle connection failure and retry', async () => {
    // Test retry logic
  });
  
  it('should cleanup connections on disconnect', async () => {
    // Test resource cleanup
  });
});

TC-UT-002: Database Persistence Layer

describe('StreamingMessageRepository', () => {
  it('should save streaming messages with proper indexing', async () => {
    // Test message persistence
  });
  
  it('should retrieve messages by session ID', async () => {
    // Test message retrieval
  });
  
  it('should handle concurrent writes safely', async () => {
    // Test race conditions
  });
});

TC-UT-003: Stream State Management

describe('StreamStateManager', () => {
  it('should persist stream state across restarts', async () => {
    // Test state persistence
  });
  
  it('should handle partial stream recovery', async () => {
    // Test recovery scenarios
  });
});

2. Integration Tests

TC-INT-001: WebSocket-Database Integration

describe('WebSocket-Database Integration', () => {
  it('should persist messages in real-time during streaming', async () => {
    // Test real-time persistence
  });
  
  it('should handle database connection loss during streaming', async () => {
    // Test DB failure scenarios
  });
});

TC-INT-002: Page Refresh Survival

describe('Page Refresh Survival', () => {
  it('should recover active streams after page refresh', async () => {
    // Test stream recovery after refresh
  });
  
  it('should maintain stream continuity across multiple refreshes', async () => {
    // Test multiple refresh cycles
  });
});

3. End-to-End Tests (Playwright)

TC-E2E-001: Basic Stream Survival

test('Stream survival across page refresh', async ({ page }) => {
  // Initiate streaming
  // Simulate page refresh
  // Verify stream resumption
});

TC-E2E-002: Multiple Tool Calls (Test 12)

test('Multiple concurrent tool calls survival', async ({ page }) => {
  // Launch multiple parallel streams
  // Refresh page
  // Verify all streams resume correctly
});

TC-E2E-003: Long-Running Tasks (Test 10)

test('Long-running task survival', async ({ page }) => {
  // Start long-running task (>30s)
  // Refresh during execution
  // Verify task completion and state
});

Edge Cases & Critical Scenarios

Network Interruption Scenarios

• TC-EDGE-001: WiFi disconnection during active stream
• TC-EDGE-002: Intermittent network connectivity
• TC-EDGE-003: DNS resolution failures
• TC-EDGE-004: Proxy server interruptions

Database Failure Scenarios

• TC-EDGE-005: Database connection timeout
• TC-EDGE-006: Database disk full
• TC-EDGE-007: Database lock contention
• TC-EDGE-008: Database corruption recovery

Concurrency & Performance

• TC-EDGE-009: 100+ concurrent streams
• TC-EDGE-010: Memory pressure scenarios
• TC-EDGE-011: CPU throttling impact
• TC-EDGE-012: Browser tab suspension

MCP Server Errors

• TC-EDGE-013: MCP server restart during streaming
• TC-EDGE-014: MCP protocol version mismatch
• TC-EDGE-015: MCP authentication failures
• TC-EDGE-016: MCP resource exhaustion

Test Data Management

Database Fixtures

// Test database setup
const testDb = {
  sessions: [
    { id: 'session-1', status: 'active', created_at: new Date() },
    { id: 'session-2', status: 'paused', created_at: new Date() }
  ],
  messages: [
    // Mock streaming messages
  ]
};

Mock WebSocket Server

// Mock WebSocket server for testing
class MockWebSocketServer {
  private connections = new Set();
  
  simulateDisconnect() {
    // Force disconnect all connections
  }
  
  simulateLatency(ms: number) {
    // Add artificial latency
  }
}

Performance Testing

Load Testing Scenarios

• 100 users streaming simultaneously
• 1GB data transfer per stream
• 24-hour continuous streaming
• Database with 1M+ messages

Stress Testing

• Memory leaks detection
• Connection pooling exhaustion
• Database query performance
• WebSocket message batching

Security Testing

Authentication & Authorization

• Invalid token handling
• Session hijacking prevention
• Rate limiting bypass attempts
• Cross-origin request validation

Data Integrity

• Message tampering detection
• Stream replay prevention
• Database injection protection
• XSS prevention in UI

Missing Critical Test Cases

1. Browser Compatibility: Test across Chrome, Firefox, Safari, Edge
2. Mobile Responsiveness: Test on mobile browsers
3. Offline Scenario: Network disconnection handling
4. Browser Updates: Stream survival across browser updates
5. Extension Updates: Stream survival across extension updates
6. System Sleep: System sleep/wake scenarios
7. Timezone Changes: Stream behavior across timezone changes
8. Multiple Monitor: UI state across monitor changes

Database Migration Testing

Schema Evolution

-- Test migration scripts
ALTER TABLE streams ADD COLUMN metadata JSON;
CREATE INDEX idx_streams_session ON streams(session_id);

-- Verify data integrity after migration
SELECT COUNT(*) FROM streams WHERE session_id IS NULL;

Backward Compatibility

• Old client + New server compatibility
• New client + Old server compatibility
• Partial migration scenarios

Implementation Recommendations

1. Add Test Infrastructure:

   • WebSocket testing framework
   • Database test containers
   • Network simulation tools

2. Implement Observability:

   • Performance metrics
   • Error tracking
   • Stream health monitoring

3. Add CI/CD Integration:

   • Automated E2E testing
   • Performance regression detection
   • Security vulnerability scanning

This comprehensive test strategy ensures robust streaming implementation with proper error handling, performance optimization, and user experience reliability.