Implement comprehensive Playwright e2e testing infrastructure for SVG to ICO converter

[Copilot]

This PR implements a complete end-to-end testing setup for the SVG to ICO converter website using Playwright, addressing the issue requirement to add e2e testing capabilities.

🧪 Test Infrastructure Added

Test Suites (4 files, 15+ test cases)

• tests/basic.spec.ts - Page load and basic UI validation
• tests/conversion-happy-path.spec.ts - Complete conversion workflow tests
• tests/error-handling.spec.ts - Error scenarios and edge cases
• tests/ui-interactions.spec.ts - User interface interaction testing

Test Coverage

• ✅ Happy Path: File upload → preview generation → automatic conversion → download
• ✅ Error Handling: Invalid files, unsupported formats, size limits, timeout scenarios
• ✅ UI Interactions: Drag & drop, file picker, responsive design, keyboard navigation
• ✅ Cross-Browser: Chrome, Firefox, Safari, Mobile Chrome, Mobile Safari

🔧 Configuration & Infrastructure

Playwright Setup

• Configuration: playwright.config.ts with multi-browser support
• Test Fixtures: Valid/invalid SVG samples for comprehensive testing
• Helper Utilities: ConversionPage class for reusable test operations
• CI/CD: GitHub Actions workflow for automated testing on PRs

NPM Scripts Added

npm run test:e2e          # Run all tests
npm run test:e2e:ui       # Interactive mode
npm run test:e2e:headed   # Visible browser mode
npm run test:e2e:debug    # Debug mode

🎯 Component Changes (Minimal & Non-Intrusive)

Added data-testid attributes to existing components for reliable test selectors:

FileUploader Component

• file-drop-zone - Main drag-and-drop area
• file-info - File information display
• error-message - Error message container

Preview Component

• preview-container - Preview images container
• preview-{size} - Individual preview elements (e.g., preview-256)
• size-checkbox-{size} - Size selection checkboxes
• download-button - ICO download button

📱 Application Screenshot

The application running successfully with the new test infrastructure. The UI shows the drag & drop upload area and preview section that the e2e tests validate.

🚀 Key Features

Automatic Conversion Detection

Tests are designed around the app's automatic conversion behavior - no separate convert button needed, conversion happens automatically after upload.

Comprehensive Error Testing

• File format validation (SVG, PNG, JPEG, etc.)
• File size limits (50MB for images, 100MB for SVG)
• Malformed file handling
• Timeout protection for canvas operations

Cross-Platform Validation

• Desktop and mobile viewport testing
• Multiple browser engines
• Touch and keyboard interaction support

📚 Documentation

• PLAYWRIGHT-E2E-SETUP.md - Complete setup and usage guide
• .github/workflows/e2e-tests.yml - CI/CD configuration
• Updated .gitignore - Test artifacts exclusion

✨ Benefits

1. Quality Assurance: Comprehensive testing of the core conversion functionality
2. Regression Prevention: Automated testing on every PR prevents breaking changes
3. Cross-Browser Compatibility: Ensures consistent behavior across different browsers
4. Developer Productivity: Reliable test selectors and helper utilities for future test additions
5. CI/CD Integration: Automated testing workflow with artifact collection

The testing framework is production-ready and provides robust coverage of the SVG to ICO conversion workflow while maintaining the app's privacy-first, client-side architecture.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• esm.ubuntu.com
  • Triggering command: /usr/lib/apt/methods/https (dns block)
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)
• fonts.googleapis.com
  • Triggering command: /usr/local/bin/node /home/REDACTED/work/toico/toico/node_modules/next/dist/compiled/jest-worker/processChild.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[zzfadi]

I made a major change on main branch and merged into this branch. review your implementation for any needed adjustment and additions. Thanks!