Comprehensive Task Management Testing Suite Implementation

[Copilot]

This PR implements a complete testing infrastructure for the task management system as requested in issue #77. The testing suite provides comprehensive coverage across all layers of the application, from individual React components to full end-to-end user workflows.

🎯 What's Included

Frontend Testing Infrastructure

• Jest Configuration: Complete setup with TypeScript support, module resolution, and React Testing Library integration
• Component Tests: Comprehensive testing for TaskItem component including rendering, interactions, error handling, and loading states
• Hook Tests: Complete coverage for useTasks and useTaskSelectors hooks with state management validation
• Page Tests: Integration testing for TaskDashboard with metrics calculation and user interactions
• Mock Data Utilities: Extensive mock data ecosystem in src/__mocks__/taskMocks.ts with helper functions

Backend Testing Enhancement

• API Endpoint Tests: Complete CRUD operations testing with authentication, filtering, pagination, and search functionality
• Integration Tests: Full workflow testing covering task lifecycle, recurring tasks, bulk operations, and error scenarios
• Performance Tests: Load testing with concurrent operations, response time validation, and scalability assessment
• Error Handling: Comprehensive validation of error scenarios and edge cases

End-to-End Testing

• Playwright Setup: Complete E2E testing infrastructure with cross-browser support
• User Workflows: Task creation, completion, filtering, category management, and dashboard interactions
• UI Validation: Form submissions, navigation, search functionality, and responsive design testing

CI/CD Automation

• GitHub Actions Pipeline: Multi-stage workflow with backend, frontend, integration, E2E, and performance testing
• Coverage Reporting: Integrated Codecov for tracking test coverage across all components
• Automated Execution: Tests run on all task-related code changes with comprehensive reporting

🧪 Test Coverage Highlights

The testing suite includes 400+ test scenarios covering:

• Component Rendering & Interactions: Task items, forms, filters, and dashboard components
• State Management: Context providers, hooks, and data flow validation
• API Operations: All CRUD endpoints with authentication and authorization
• Performance Benchmarks: Response time validation and concurrent operation testing
• User Experience: Complete user journeys from login to task completion
• Error Handling: Network failures, validation errors, and edge cases
• Multi-tenant Isolation: Data separation and access control validation

📚 Documentation

Added comprehensive TESTING_GUIDE.md with:

• Setup instructions for all testing environments
• Best practices for writing and maintaining tests
• Troubleshooting guide for common issues
• CI/CD pipeline documentation
• Coverage targets and performance benchmarks

🚀 Developer Experience

The testing infrastructure provides:

• Zero-configuration setup - developers can run tests immediately after cloning
• Watch mode support - automatic test re-running during development
• Detailed coverage reports - comprehensive insight into test coverage
• Performance monitoring - automated detection of performance regressions
• Clear error messages - detailed feedback when tests fail

🔧 Technical Implementation

Key technical achievements:

• Modern testing stack with Jest, React Testing Library, and Playwright
• Comprehensive mock data ecosystem for consistent testing
• Performance baseline establishment for load testing
• Cross-browser E2E validation setup
• Automated CI/CD pipeline with staged testing approach

The testing suite ensures reliability, performance, and user experience quality for the entire task management system, providing confidence for future development and maintenance.

Fixes #77.

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