🧪 Comprehensive Playwright Testing Suite for Sky Drop

tests/README.md

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+# Sky Drop - Test Suite
+
+Comprehensive Playwright testing suite for the Sky Drop skydiving arcade game.
+
+## Overview
+
+This test suite provides automated end-to-end testing for Sky Drop across multiple browsers and devices, ensuring consistent gameplay experience and visual quality.
+
+## Test Categories
+
+### 🚀 Game Launch & Navigation (`game-launch.test.js`)
+- Game loading and initialization
+- Main menu display and functionality
+- Canvas rendering and responsiveness
+- Keyboard input handling
+- Aspect ratio and layout validation
+
+### 🎮 Gameplay Mechanics (`gameplay-mechanics.test.js`)
+- Player movement controls (arrows, WASD)
+- Parachute deployment system
+- Game reset functionality
+- Rapid input handling
+- Extended gameplay session testing
+
+### ⚡ Performance Testing (`performance.test.js`)
+- Load time validation (<20 seconds)
+- Memory usage monitoring
+- Frame rate measurement (30+ FPS)
+- Browser tab visibility handling
+- Window resize responsiveness
+
+### 🎨 Visual Regression (`visual-regression.test.js`)
+- Screenshot comparison testing
+- Multi-layer parallax validation
+- Parachute deployment visuals
+- Cross-viewport consistency
+- Interactive visual feedback
+
+### 🌐 Cross-Browser Compatibility (`cross-browser.test.js`)
+- Chromium, Firefox, WebKit support
+- WebGL capability verification
+- Mobile touch event handling
+- Input method consistency
+- Viewport orientation testing
+
+## Setup & Installation
+
+### Prerequisites
+- Node.js 18+
+- npm or yarn
+
+### Install Dependencies
+```bash
+cd tests
+npm install
+npx playwright install
+```
+
+### Run Tests
+
+#### All Tests
+```bash
+npm test
+```
+
+#### Specific Browser
+```bash
+npm run test:chrome    # Chromium only
+npm run test:firefox   # Firefox only
+npm run test:webkit    # WebKit/Safari only
+```
+
+#### Mobile Testing
+```bash
+npm run test:mobile
+```
+
+#### Headed Mode (Visual)
+```bash
+npm run test:headed
+```
+
+#### Debug Mode
+```bash
+npm run test:debug
+```
+
+#### UI Mode (Interactive)
+```bash
+npm run test:ui
+```
+
+## Test Configuration
+
+### Browser Support
+- **Chromium**: Primary testing browser
+- **Firefox**: Cross-browser compatibility
+- **WebKit**: Safari compatibility
+- **Mobile Chrome**: Touch/mobile testing
+- **Mobile Safari**: iOS compatibility
+
+### Test Environment
+- **Target URL**: https://downfallgames.itch.io/downfall
+- **Viewport**: Portrait orientation (360x640 preferred)
+- **Timeout**: 15 seconds for game loading
+- **Screenshots**: Taken on failures and for visual regression
+
+### Performance Thresholds
+- **Load Time**: < 20 seconds
+- **Frame Rate**: > 30 FPS (target 60 FPS)
+- **Memory Growth**: < 50MB during extended play
+- **Responsiveness**: < 1.5 second response time
+
+## CI/CD Integration
+
+### GitHub Actions
+Tests run automatically on:
+- Push to main/develop branches
+- Pull requests
+- Daily scheduled runs (2 AM UTC)
+- Manual workflow dispatch
+
+### Test Matrix
+- **Desktop**: Chromium, Firefox, WebKit
+- **Mobile**: Chrome Mobile, Safari Mobile
+- **Performance**: Dedicated performance testing
+- **Visual**: Screenshot comparison testing
+
+### Artifacts
+- Test reports (30 days retention)
+- Screenshots on failure (7 days retention)
+- Performance metrics
+- Visual diff comparisons
+
+## Test Structure
+
+```
+tests/
+├── e2e/                    # End-to-end test files
+│   ├── game-launch.test.js
+│   ├── gameplay-mechanics.test.js
+│   ├── performance.test.js
+│   ├── visual-regression.test.js
+│   └── cross-browser.test.js
+├── package.json            # Dependencies and scripts
+├── playwright.config.js    # Test configuration
+└── README.md              # This file
+```
+
+## Game-Specific Testing
+
+### Sky Drop Mechanics Tested
+- **Physics**: Realistic freefall and parachute physics
+- **Controls**: Arrow keys, WASD, Space (parachute), R (reset)
+- **Visuals**: Multi-layer parallax background system
+- **Performance**: 60 FPS gameplay in browser
+- **Compatibility**: HTML5 canvas across all browsers
+
+### Test Scenarios
+1. **Normal Gameplay**: Start → Move → Deploy parachute → Land
+2. **Extended Play**: Long session testing (memory/performance)
+3. **Rapid Input**: Stress testing with fast inputs
+4. **Visual States**: Menu, gameplay, parachute deployment
+5. **Error Recovery**: Reset functionality and state management
+
+## Debugging Tests
+
+### Common Issues
+- **Loading Timeout**: Game may take longer on slow connections
+- **Frame Detection**: itch.io iframe structure changes
+- **Input Focus**: Canvas must be focused for keyboard events
+- **Screenshot Variance**: Dynamic content causes visual test failures
+
+### Debug Commands
+```bash
+# Run single test file
+npx playwright test game-launch.test.js
+
+# Run with browser visible
+npx playwright test --headed
+
+# Run specific test
+npx playwright test -g "should load the game page successfully"
+
+# Generate test with codegen
+npx playwright codegen https://downfallgames.itch.io/downfall
+```
+
+### Trace Viewer
+```bash
+# View test traces
+npx playwright show-trace trace.zip
+```
+
+## Contributing
+
+### Adding New Tests
+1. Create test file in `e2e/` directory
+2. Follow existing naming convention
+3. Use `test.describe()` for grouping
+4. Include proper timeouts and waits
+5. Add meaningful assertions
+
+### Visual Testing Guidelines
+- Use appropriate threshold values (0.2-0.4)
+- Account for dynamic content
+- Test multiple viewport sizes
+- Include fallback assertions
+
+### Performance Testing
+- Monitor memory usage patterns
+- Validate frame rates
+- Test under various conditions
+- Include browser-specific optimizations
+
+## Reporting
+
+### Test Reports
+- HTML reports generated automatically
+- JSON/JUnit formats for CI integration
+- Screenshots attached to failed tests
+- Performance metrics included
+
+### View Reports
+```bash
+npm run report
+```
+
+Reports are also available as GitHub Actions artifacts.
+
+## Maintenance
+
+### Regular Updates
+- Update Playwright version monthly
+- Review and update screenshot baselines
+- Monitor performance thresholds
+- Check browser compatibility changes
+
+### Test Health
+- Monitor test flakiness
+- Update selectors if game changes
+- Adjust timeouts based on performance
+- Review visual regression thresholds
+
+---
+
+**Game URL**: https://downfallgames.itch.io/downfall
+**Test Environment**: Automated via GitHub Actions
+**Coverage**: Cross-browser, mobile, performance, visual regression