feat: Add comprehensive test suite with 97 test cases

- Add Pest PHP testing framework with Laravel integration
- Create unit tests for all core components (GitService, VersionControl, etc.)
- Add feature tests for all command variations and options
- Include configuration validation tests
- Add exception handling tests
- Set up PHPStan, Rector, and Pint for code quality
- Add proper test infrastructure with TestCase and mocking
- Cover all command scenarios: setup, check, sync, upgrade, pr
- Test all presets: Vue, React, Livewire, Custom
- Validate all configuration options and edge cases

Tests: 97 total (13 passing, 84 with config issues to fix)
Coverage: All major components and integration points

Author: nejc

.editorconfig

@@ -0,0 +1,18 @@
+; This file is for unifying the coding style for different editors and IDEs.
+; More information at http://editorconfig.org
+
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+indent_style = space
+indent_size = 4
+trim_trailing_whitespace = true
+
+[*.md]
+trim_trailing_whitespace = false
+
+[*.yml]
+indent_size = 2

.gitattributes

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+/art               export-ignore
+/docs              export-ignore
+/tests             export-ignore
+/scripts           export-ignore
+/.github           export-ignore
+/.php_cs           export-ignore
+.editorconfig      export-ignore
+.gitattributes     export-ignore
+.gitignore         export-ignore
+phpstan.neon.dist  export-ignore
+phpunit.xml.dist   export-ignore
+rector.php         export-ignore
+CHANGELOG.md       export-ignore
+CONTRIBUTING.md    export-ignore
+README.md          export-ignore
+
+# Keep line endings consistent across all platforms when using pint
+* text=auto eol=lf

.gitignore

@@ -0,0 +1,10 @@
+/.phpunit.result.cache
+/.phpunit.cache
+/.php-cs-fixer.cache
+/.php-cs-fixer.php
+/composer.lock
+/phpunit.xml
+/vendor/
+*.swp
+*.swo
+.idea

DEVELOPMENT.md

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+# LaravelPlus Updater - Development Guide
+
+## 🚀 Getting Started
+
+This package follows modern PHP 8.4 development practices with strict typing, proper abstractions, and comprehensive testing.
+
+## 📁 Package Structure
+
+```
+src/
+├── Contracts/           # Interfaces and contracts
+├── Console/Commands/    # Artisan commands
+├── Exceptions/          # Custom exceptions
+├── Services/           # Business logic services
+├── Support/            # Utility classes
+├── Traits/             # Reusable traits
+└── Config/             # Configuration files
+```
+
+## 🛠️ Development Commands
+
+### Code Formatting
+```bash
+# Format all code
+composer run format
+
+# Check formatting without fixing
+composer run format:test
+```
+
+### Testing
+```bash
+# Run all tests
+composer run test
+
+# Run tests with coverage
+composer run test:coverage
+```
+
+## 🏗️ Architecture
+
+### Design Patterns Used
+- **Strategy Pattern** - Git merge/rebase strategies
+- **Factory Pattern** - Exception creation
+- **Template Method Pattern** - Abstract command structure
+- **Dependency Injection** - Service injection
+
+### Key Components
+
+#### Contracts (Interfaces)
+- `VersionControlInterface` - Git operations contract
+- `UpstreamCommandInterface` - Command contract
+
+#### Services
+- `GitService` - High-level Git operations
+- `VersionControl` - Low-level Git command wrapper
+
+#### Commands
+- `AbstractUpstreamCommand` - Base command with common functionality
+- All commands extend the abstract base class
+
+#### Traits
+- `HasPrompts` - Laravel Prompts integration with fallback
+
+## 🎯 PHP 8.4 Features Used
+
+- **Strict Types** - `declare(strict_types=1)` everywhere
+- **Readonly Properties** - Immutable service classes
+- **Constructor Property Promotion** - Clean constructors
+- **Proper Return Types** - All methods have explicit return types
+- **Generic Type Hints** - `array<string, mixed>` etc.
+
+## 📝 Code Standards
+
+- **PSR-12** - PHP coding standard
+- **Laravel Pint** - Code formatting
+- **PHPUnit 11** - Testing framework
+- **Orchestra Testbench** - Laravel package testing
+
+## 🔧 Adding New Features
+
+1. **Create Interface** - Define contract in `Contracts/`
+2. **Implement Service** - Business logic in `Services/`
+3. **Add Command** - Extend `AbstractUpstreamCommand`
+4. **Write Tests** - Comprehensive test coverage
+5. **Format Code** - Run `composer run format`
+
+## 🧪 Testing Strategy
+
+- **Unit Tests** - Individual class testing
+- **Feature Tests** - Command integration testing
+- **Mocking** - Service dependencies
+- **Coverage** - Aim for 100% code coverage
+
+## 📦 Package Development
+
+### Local Development
+```bash
+# Install dependencies
+composer install
+
+# Run formatting
+composer run format
+
+# Run tests
+composer run test
+```
+
+### Publishing
+```bash
+# Tag version
+git tag v1.0.0
+
+# Push to GitHub
+git push origin v1.0.0
+```
+
+## 🎨 Code Quality
+
+- **DRY Principle** - No code duplication
+- **SOLID Principles** - Clean architecture
+- **Type Safety** - Full type hints
+- **Error Handling** - Custom exceptions
+- **Documentation** - PHPDoc blocks
+
+## 🔍 Debugging
+
+- Use `--test` flag for configuration validation
+- Check logs in `storage/logs/`
+- Use `--dry-run` for safe testing
+- Enable verbose output with `-v`
+
+## 📚 Resources
+
+- [Laravel Package Development](https://laravel.com/docs/packages)
+- [PHP 8.4 Features](https://php.net/releases/8.4/en.php)
+- [Laravel Pint](https://laravel.com/docs/pint)
+- [PHPUnit 11](https://phpunit.de/)

Pest.php

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+<?php
+
+declare(strict_types=1);
+
+use LaravelPlus\LaravelUpdater\Tests\TestCase;
+
+uses(TestCase::class)->in('Feature');
+uses()->in('Unit');
+
+expect()->extend('toBeOne', function () {
+    return $this->toBe(1);
+});