Test Coverage Analysis¶

Executive Summary¶

The Playcast platform has a mixed testing landscape with significant gaps in coverage across applications and libraries. While the infrastructure for testing is well-established with Jest, Cypress, and Vitest configurations, many components lack comprehensive unit tests, and several critical areas have minimal or no test coverage.

Current Testing Infrastructure¶

Testing Frameworks and Tools¶

Primary Testing Stack¶

Jest: Primary unit testing framework for Node.js applications and libraries
Cypress: Component and end-to-end testing for React components
Vitest: Modern testing framework used in some applications (marketing, debug tools)
Testing Library: React Testing Library for component testing
MSW (Mock Service Worker): API mocking for integration tests

Test Environments¶

Node.js Environment: Used for backend services and utility libraries
JSDOM Environment: Used for frontend libraries requiring DOM simulation
Cypress Component Testing: Used for React component testing with real browser environment

Configuration Analysis¶

Jest Configuration Pattern¶

All Jest-enabled projects follow a consistent configuration pattern:

export default {
  displayName: 'project-name',
  preset: '../../jest.preset.js',
  testEnvironment: 'node', // or 'jsdom' for frontend
  transform: {
    '^.+\\.[tj]s$': ['ts-jest', { tsconfig: '<rootDir>/tsconfig.spec.json' }],
  },
  moduleFileExtensions: ['ts', 'js', 'html'],
  coverageDirectory: '../../coverage/path/to/project',
};

Nx Integration¶

All projects use Nx's Jest executor (@nx/jest:jest)
Coverage reports are centralized in the workspace root
Test targets are consistently configured across projects

Application-Level Testing Analysis¶

Backend Applications¶

Realtime API (`apps/realtime-api/`)¶

Status: Jest configured, minimal test coverage
Test Files: No substantial test files found
Critical Gaps:
WebSocket connection handling
Message routing and validation
Session management
Authentication middleware
Real-time event processing

Node Service (`apps/node-service/`)¶

Status: Jest configured, no test files found
Critical Gaps:
Service orchestration logic
Inter-service communication
Error handling and recovery

Bot Services (`apps/bots/`)¶

Discord Bot: Jest configured, no substantial tests
Twitch Bot: Jest configured, no substantial tests
Critical Gaps:
Command processing
API integration logic
Event handling
Rate limiting

Desktop Applications¶

Host Application (`apps/host/`)¶

Host Electron: Jest configured, minimal coverage
Host Frontend: Jest configured with setup file, minimal coverage
Critical Gaps:
Electron main process functionality
IPC communication between processes
Game session management
Display capture integration
Authentication flows

Orchestrator (`apps/orchestrator/`)¶

Status: Jest configured for electron component, minimal coverage
Critical Gaps:
Service coordination logic
Process management
Configuration handling

Web Applications¶

Marketing Website (`apps/marketing/`)¶

Status: Uses Vitest, has example test only
Test Files: Single example test file
Critical Gaps:
Component rendering
User interaction flows
Form validation
Authentication integration

Admin Dashboard (`apps/admin-dashboard/`)¶

Status: Jest configured, no test files found
Critical Gaps:
Administrative functionality
Data visualization components
User management features

Native Applications¶

Playjector (`apps/playjector/`)¶

Status: Jest configured for TypeScript wrapper, minimal C++ testing
Test Files: Single placeholder test
Critical Gaps:
C++ core functionality testing
Game capture logic
Video encoding/decoding
Input injection
Driver integration
Performance-critical code paths

Library-Level Testing Analysis¶

Well-Tested Libraries¶

StateStore (`libs/StateStore/`)¶

Status: ✅ Good test coverage
Test Files: Comprehensive unit tests
Coverage Areas:
State management operations
Listener functionality
Replication logic
Transform functions
Rate limiting

Registry (`libs/Registry/`)¶

Status: ✅ Partial test coverage
Test Files: Windows registry operations
Coverage Areas:
Registry read/write operations
Machine ID generation
Error handling for registry access
Gaps: Some test cases are commented out

Partially Tested Libraries¶

TwitchBot (`libs/TwitchBot/`)¶

Status: ⚠️ Minimal testing
Test Files: Placeholder test only
Critical Gaps:
Twitch API integration
Authentication handling
Command processing
Rate limiting

SharedComponents (`libs/SharedComponents/`)¶

Status: ⚠️ Minimal testing
Test Files: Multiple test files but mostly empty
Critical Gaps:
React component rendering
User interaction handling
Modal functionality
Form components

Untested Libraries¶

Core Libraries with No Tests¶

CoreTypes (libs/CoreTypes/): Type definitions only, no test configuration
Messaging (libs/Messaging/): Critical communication library, Jest configured but no tests
ApiUtil (libs/ApiUtil/): HTTP utilities, no substantial tests
GlobalConfig (libs/GlobalConfig/): Configuration management, no tests

Feature Libraries with No Tests¶

Peer (libs/Peer/): WebRTC functionality, Jest configured but no tests
InputCapture (libs/InputCapture/): Input device handling, Cypress configured but no tests
Analytics (libs/Analytics/): User tracking, Jest configured but no tests
Settings (libs/Settings/): User preferences, no test configuration

Integration Libraries with No Tests¶

OAuthButtons (libs/OAuthButtons/): Social authentication, Jest configured but no tests
ImageFactory (libs/ImageFactory/): Image processing, Jest configured but no tests
Qrcode (libs/Qrcode/): QR code generation, Jest configured but no tests

Testing Framework Usage Patterns¶

Jest Usage¶

Total Projects with Jest: 25+ applications and libraries
Projects with Actual Tests: ~3-4 projects
Common Patterns:
Mocking external dependencies
Testing utility functions
State management testing
Error handling scenarios

Cypress Usage¶

Component Testing: Used in InputCapture, MobileGamepad, Settings
Configuration: Proper Vite integration with React support
Usage: Minimal actual test implementation

Vitest Usage¶

Applications: Marketing website, debug tools
Status: Example tests only
Integration: Good Vite integration setup

Critical Testing Gaps by Category¶

Real-Time Communication¶

WebSocket message handling: No tests for real-time message processing
Peer-to-peer connections: WebRTC functionality untested
State synchronization: Cross-client state management untested
Connection recovery: Network failure scenarios untested

Authentication and Security¶

Clerk integration: Authentication flows untested
Token management: JWT handling and refresh untested
Permission systems: Role-based access untested
Security middleware: Request validation untested

Game Streaming Core¶

Video capture: Native capture functionality untested
Audio processing: Audio capture and processing untested
Input injection: Keyboard/mouse/gamepad input untested
Performance optimization: Critical path performance untested

Cross-Platform Integration¶

Electron IPC: Inter-process communication untested
Native module integration: C++ to JavaScript bridge untested
System API usage: Windows API integration untested
Driver interaction: Hardware driver communication untested

Data Management¶

Database operations: Data persistence untested
Cache management: Redis integration untested
File operations: File system operations untested
Configuration management: Settings and preferences untested

Testing Challenges Identified¶

Technical Challenges¶

Native Component Testing¶

C++ Testing: Limited infrastructure for testing C++ components
System Dependencies: Tests require Windows-specific APIs
Hardware Dependencies: Some functionality requires specific hardware
Performance Testing: Difficult to test performance-critical paths

Real-Time Feature Testing¶

WebSocket Testing: Complex to test real-time bidirectional communication
Timing Dependencies: Race conditions and timing-sensitive code
Multi-Client Scenarios: Testing interactions between multiple clients
Network Simulation: Testing various network conditions

Integration Testing¶

External Services: Dependencies on Clerk, Discord, Twitch APIs
Database State: Managing test database state
File System: Testing file operations across different environments
Process Management: Testing multi-process applications

Infrastructure Challenges¶

Test Environment Setup¶

Windows Dependencies: Many components require Windows environment
Hardware Requirements: Some tests need specific hardware
Service Dependencies: Tests require running external services
Configuration Complexity: Complex setup for full integration tests

CI/CD Integration¶

Test Execution Time: Long-running tests for native components
Environment Consistency: Ensuring consistent test environments
Parallel Execution: Managing test parallelization
Resource Management: Memory and CPU usage during testing

Recommendations Summary¶

Immediate Priorities (High Impact, Low Complexity)¶

Core Utility Libraries: Add unit tests for Messaging, ApiUtil, GlobalConfig
State Management: Expand StateStore tests to cover edge cases
Authentication: Test Clerk integration and token handling
Configuration: Test GlobalConfig and Settings libraries

Medium-Term Goals (High Impact, Medium Complexity)¶

Real-Time Communication: Test WebSocket and peer-to-peer functionality
Component Testing: Add Cypress tests for React components
Integration Testing: Test cross-library interactions
Error Handling: Test error scenarios and recovery

Long-Term Objectives (High Impact, High Complexity)¶

Native Component Testing: Establish C++ testing infrastructure
End-to-End Testing: Full user journey testing
Performance Testing: Load and stress testing
Cross-Platform Testing: Multi-environment test coverage

Testing Infrastructure Improvements¶

Test Data Management: Centralized test data and fixtures
Mock Services: Comprehensive mocking for external dependencies
Test Utilities: Shared testing utilities and helpers
Coverage Reporting: Automated coverage tracking and reporting