Initial commit

2025-11-30 08:43:33 +08:00
commit 624998dbc3
27 changed files with 6036 additions and 0 deletions
--- a/.claude-plugin/plugin.json
+++ b/.claude-plugin/plugin.json
@@ -0,0 +1,12 @@
+{
+  "name": "typo3-testing",
+  "description": "Create and manage TYPO3 extension tests with comprehensive testing infrastructure. Includes unit, functional, and acceptance testing support, PHPUnit configurations, Docker setup, CI/CD templates, and automated test generation following TYPO3 best practices.",
+  "version": "1.1.0-20251114",
+  "author": {
+    "name": "Netresearch DTT GmbH",
+    "email": "info@netresearch.de"
+  },
+  "skills": [
+    "./"
+  ]
+}
--- a/.gitignore
+++ b/.gitignore
@@ -0,0 +1,14 @@
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Temporary
+*.tmp
+*.bak
--- a/20
+++ b/20
@@ -0,0 +1,20 @@
+GNU GENERAL PUBLIC LICENSE
+Version 2, June 1991
+
+Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+
+Everyone is permitted to copy and distribute verbatim copies
+of this license document, but changing it is not allowed.
+
+[Full GPL-2.0 license text - same as typo3-docs-skill]
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
--- a/README.md
+++ b/README.md
@@ -0,0 +1,3 @@
+# typo3-testing
+
+Create and manage TYPO3 extension tests with comprehensive testing infrastructure. Includes unit, functional, and acceptance testing support, PHPUnit configurations, Docker setup, CI/CD templates, and automated test generation following TYPO3 best practices.
--- a/SKILL.md
+++ b/SKILL.md
@@ -0,0 +1,256 @@
+---
+name: typo3-testing
+version: 1.1.0
+description: Create, configure, and manage TYPO3 extension tests (unit, functional, acceptance) following official TYPO3 testing framework patterns. Use when setting up tests, writing test cases, configuring PHPUnit, managing fixtures, or integrating CI/CD pipelines for TYPO3 extensions. Covers PHPUnit 11/12, TYPO3 v12/v13 LTS, modern dependency injection testing patterns, and comprehensive quality tooling (PHPStan level 10, Rector, php-cs-fixer).
+license: Complete terms in LICENSE.txt
+---
+
+# TYPO3 Testing Skill
+
+## Purpose
+
+This skill helps developers create, configure, and manage TYPO3 extension tests following official TYPO3 testing framework patterns and community best practices.
+
+## Quick Start Decision Tree
+
+### 1. What do you need?
+
+```
+├─ Create new test
+│  ├─ Unit test (no database, fast)
+│  ├─ Functional test (with database)
+│  └─ Acceptance test (browser-based E2E)
+│
+├─ Setup testing infrastructure
+│  ├─ Basic (unit + functional)
+│  └─ Full (+ acceptance with Docker)
+│
+├─ Add CI/CD
+│  ├─ GitHub Actions
+│  └─ GitLab CI
+│
+├─ Manage fixtures
+│  ├─ Create fixture
+│  └─ Update fixture
+│
+└─ Understand testing patterns
+   └─ Check references/
+```
+
+### 2. Which test type?
+
+**Unit Tests** → Use when:
+- Testing pure logic without external dependencies
+- No database access needed
+- Fast execution required (milliseconds)
+- Examples: Validators, Value Objects, Utilities
+
+**Functional Tests** → Use when:
+- Testing database interactions
+- Full TYPO3 instance needed
+- Testing repositories, controllers, hooks
+- Slower execution acceptable (seconds)
+
+**Acceptance Tests** → Use when:
+- Testing complete user workflows
+- Browser interaction required
+- Frontend functionality validation
+- Slowest execution (minutes)
+
+### 3. Infrastructure exists?
+
+**No** → Run setup script:
+```bash
+# Basic setup (unit + functional)
+scripts/setup-testing.sh
+
+# With acceptance testing
+scripts/setup-testing.sh --with-acceptance
+```
+
+**Yes** → Generate test:
+```bash
+# Generate test class
+scripts/generate-test.sh <type> <ClassName>
+
+# Examples:
+scripts/generate-test.sh unit UserValidator
+scripts/generate-test.sh functional ProductRepository
+scripts/generate-test.sh acceptance LoginCest
+```
+
+## Commands
+
+### Setup Testing Infrastructure
+```bash
+scripts/setup-testing.sh [--with-acceptance]
+```
+Creates:
+- composer.json dependencies
+- Build/phpunit/ configs
+- Build/Scripts/runTests.sh
+- Tests/ directory structure
+- .github/workflows/ CI configs (optional)
+- docker-compose.yml (with --with-acceptance)
+
+### Generate Test Class
+```bash
+scripts/generate-test.sh <type> <ClassName>
+```
+Creates:
+- Test class file
+- Fixture file (for functional tests)
+- AGENTS.md in test directory (if missing)
+
+### Validate Setup
+```bash
+scripts/validate-setup.sh
+```
+Checks:
+- Required composer dependencies
+- PHPUnit configuration files
+- Test directory structure
+- Docker availability (for acceptance tests)
+
+## Test Execution
+
+### via runTests.sh (Recommended)
+```bash
+# Unit tests
+Build/Scripts/runTests.sh -s unit
+
+# Functional tests
+Build/Scripts/runTests.sh -s functional
+
+# Acceptance tests
+Build/Scripts/runTests.sh -s acceptance
+
+# All quality checks
+Build/Scripts/runTests.sh -s lint
+Build/Scripts/runTests.sh -s phpstan
+Build/Scripts/runTests.sh -s cgl
+```
+
+### via Composer
+```bash
+# All tests
+composer ci:test
+
+# Specific suites
+composer ci:test:php:unit
+composer ci:test:php:functional
+
+# Quality tools
+composer ci:test:php:lint
+composer ci:test:php:phpstan
+composer ci:test:php:cgl
+```
+
+## References
+
+Detailed documentation for each testing aspect:
+
+- [Unit Testing](references/unit-testing.md) - UnitTestCase patterns, mocking, assertions
+- [Functional Testing](references/functional-testing.md) - FunctionalTestCase, fixtures, database
+- [Acceptance Testing](references/acceptance-testing.md) - Codeception, Selenium, page objects
+- [JavaScript Testing](references/javascript-testing.md) - CKEditor plugins, data-* attributes, frontend tests
+- [Test Runners](references/test-runners.md) - runTests.sh orchestration patterns
+- [CI/CD Integration](references/ci-cd.md) - GitHub Actions, GitLab CI workflows
+- [Quality Tools](references/quality-tools.md) - PHPStan, Rector, php-cs-fixer
+
+## Templates
+
+Ready-to-use configuration files and examples:
+
+- `templates/AGENTS.md` - AI assistant context template for test directories
+- `templates/UnitTests.xml` - PHPUnit config for unit tests
+- `templates/FunctionalTests.xml` - PHPUnit config for functional tests
+- `templates/FunctionalTestsBootstrap.php` - Bootstrap for functional tests
+- `templates/runTests.sh` - Test orchestration script
+- `templates/github-actions-tests.yml` - GitHub Actions workflow
+- `templates/docker-compose.yml` - Docker services for acceptance tests
+- `templates/codeception.yml` - Codeception configuration
+- `templates/example-tests/` - Example test classes
+
+## Fixture Management (Functional Tests)
+
+### Create Fixture
+1. Create CSV file in `Tests/Functional/Fixtures/`
+2. Define database table structure
+3. Add test data rows
+4. Import in test via `$this->importCSVDataSet()`
+
+### Fixture Strategy
+- Keep fixtures minimal (only required data)
+- One fixture per test scenario
+- Use descriptive names (e.g., `ProductWithCategories.csv`)
+- Document fixture purpose in AGENTS.md
+
+## CI/CD Integration
+
+### GitHub Actions
+```bash
+# Add workflow
+cp templates/github-actions-tests.yml .github/workflows/tests.yml
+
+# Customize matrix (PHP versions, TYPO3 versions, databases)
+```
+
+### GitLab CI
+See `references/ci-cd.md` for GitLab CI example configuration.
+
+## Test Organization Standards
+
+**When organizing tests**, apply these patterns:
+1. Group tests by feature or domain, not by test type
+2. Name unit and functional tests with `*Test.php` suffix
+3. Name acceptance tests with `*Cest.php` suffix
+4. Keep fixtures minimal, reusable, and well-documented
+5. Use specific assertions (assertSame, assertInstanceOf) over generic assertEquals
+6. Ensure each test can run independently without side effects
+7. Apply setUp() and tearDown() methods consistently across test classes
+8. Document test strategy in AGENTS.md to explain what each directory tests
+
+## Troubleshooting
+
+**Tests not found:**
+- Check PHPUnit XML testsuites configuration
+- Verify test class extends correct base class
+- Check file naming convention (*Test.php)
+
+**Database errors in functional tests:**
+- Verify database driver in FunctionalTests.xml
+- Check fixture CSV format (proper escaping)
+- Ensure bootstrap file is configured
+
+**Acceptance tests fail:**
+- Verify Docker and Docker Compose installed
+- Check Selenium service is running
+- Review Codeception configuration
+
+## Reference Material Usage
+
+**When understanding TYPO3 testing patterns**, read [TYPO3 Testing Documentation](https://docs.typo3.org/m/typo3/reference-coreapi/main/en-us/Testing/) for:
+- Official testing framework usage
+- Best practices and patterns
+- Version-specific requirements
+
+**When working with test framework internals**, check [TYPO3 Testing Framework](https://github.com/typo3/testing-framework) for:
+- Framework API reference
+- Base test case implementations
+- Fixture handling utilities
+
+**When seeking reference implementations**, study [Tea Extension](https://github.com/TYPO3BestPractices/tea) for:
+- Production-quality test examples
+- Complete testing infrastructure setup
+- Best practice patterns in action
+
+**When writing PHPUnit tests**, consult [PHPUnit Documentation](https://phpunit.de/documentation.html) for:
+- Assertion methods
+- Test doubles and mocking
+- Configuration options
+
+**When implementing acceptance tests**, reference [Codeception Documentation](https://codeception.com/docs/) for:
+- Page object patterns
+- Browser automation
+- E2E test scenarios
--- a/claudedocs/refactoring-summary.md
+++ b/claudedocs/refactoring-summary.md
@@ -0,0 +1,44 @@
+# SKILL.md Refactoring Summary
+
+**Date:** 2025-11-14
+**Version Change:** 1.0.0 → 1.1.0
+**Skill:** typo3-testing
+
+## Changes Applied
+
+### Pattern 2: Converted "## Best Practices" to Imperative Form
+- **Before:** "## Best Practices" with numbered list
+- **After:** "## Test Organization Standards" with imperative "When organizing tests" format
+- **Changes:**
+  - Added "When organizing tests, apply these patterns:" trigger
+  - Converted each practice to action-oriented instruction
+  - Maintained all 8 best practices with clearer directives
+
+### Pattern 4: Converted "## Resources" to Imperative Usage
+- **Before:** Simple bullet list with URLs and descriptions
+- **After:** "## Reference Material Usage" with trigger-based usage instructions
+- **Changes:**
+  - "When understanding TYPO3 testing patterns" → TYPO3 Testing Documentation
+  - "When working with test framework internals" → TYPO3 Testing Framework
+  - "When seeking reference implementations" → Tea Extension
+  - "When writing PHPUnit tests" → PHPUnit Documentation
+  - "When implementing acceptance tests" → Codeception Documentation
+  - Each entry specifies what information to extract
+
+## Impact Analysis
+
+**Readability:** Improved - clearer when to apply each practice
+**Consistency:** Aligned with typo3-ddev-skill and typo3-docs-skill patterns
+**Usability:** Enhanced - readers know when to consult each resource
+**Structure:** Maintained complete information while improving clarity
+
+## Files Modified
+
+- `/SKILL.md` (lines 1-257)
+
+## Verification
+
+- Version number updated in YAML frontmatter: ✓
+- Best Practices converted to imperative form: ✓
+- Resources converted to usage-based format: ✓
+- No broken links: ✓
--- a/plugin.lock.json
+++ b/plugin.lock.json
@@ -0,0 +1,137 @@
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+    "version": "1.1.0-20251114"
+  },
+  "content": {
+    "files": [
+      {
+        "path": "LICENSE",
+        "sha256": "62e5db1ab91125b874e6408a65301f10802d8204c06b3047ec07f84d7db3f471"
+      },
+      {
+        "path": "README.md",
+        "sha256": "f28a4c09a65697ddbcd61ba2f1fb25300f9962a060a2b24f218ef973c04eba65"
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+        "sha256": "d186766c200a72755ea9456677a8a26632b6fa5093aad847f9c4463ea56aac15"
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+        "sha256": "d912bf3a55c3fde7d5b35dd6b8d217a2c92dc56cbce2aa833b97cbf4f930c090"
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+      {
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+      {
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+        "sha256": "8da189186487e10e5d5ddf0c51302138c169220a2c11306c4eab345230853d41"
+      },
+      {
+        "path": "templates/AGENTS.md",
+        "sha256": "9a0c9055ce3404dca8f3913515de25698030855e5583367450aae2eb22c56e17"
+      },
+      {
+        "path": "templates/FunctionalTests.xml",
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+      },
+      {
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+        "sha256": "85c24f53e5a1f7e959312d141fd62261f0440be3ca70a45896082e0b5353dd2b"
+      },
+      {
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+        "sha256": "2693efec58eb5ddebd218d2a452581f21c02397fa214fea3ae46e677516881dd"
+      },
+      {
+        "path": "templates/example-tests/ExampleAcceptanceCest.php",
+        "sha256": "30e158149508c15ecb75de850d8b6f9b09baad0014d6ab0183aba249dbd03d10"
+      },
+      {
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+      },
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+}
--- a/references/acceptance-testing.md
+++ b/references/acceptance-testing.md
@@ -0,0 +1,468 @@
+# Acceptance Testing in TYPO3
+
+Acceptance tests verify complete user workflows through browser automation using Codeception and Selenium.
+
+## When to Use Acceptance Tests
+
+- Testing complete user journeys (login → browse → checkout)
+- Frontend functionality validation
+- Cross-browser compatibility
+- JavaScript-heavy interactions
+- Visual regression testing
+
+## Requirements
+
+- Docker and Docker Compose
+- Codeception
+- Selenium (ChromeDriver or Firefox)
+- Web server (Nginx/Apache)
+
+## Setup
+
+### 1. Install Codeception
+
+```bash
+composer require --dev codeception/codeception codeception/module-webdriver codeception/module-asserts
+```
+
+### 2. Initialize Codeception
+
+```bash
+vendor/bin/codecept bootstrap
+```
+
+### 3. Docker Compose
+
+Create `Build/docker-compose.yml`:
+
+```yaml
+version: '3.8'
+
+services:
+  web:
+    image: php:8.2-apache
+    volumes:
+      - ../../:/var/www/html
+    ports:
+      - "8000:80"
+    environment:
+      - TYPO3_CONTEXT=Testing
+    depends_on:
+      - db
+
+  db:
+    image: mysql:8.0
+    environment:
+      MYSQL_ROOT_PASSWORD: root
+      MYSQL_DATABASE: typo3_test
+    ports:
+      - "3306:3306"
+
+  selenium:
+    image: selenium/standalone-chrome:latest
+    ports:
+      - "4444:4444"
+    shm_size: 2gb
+```
+
+### 4. Codeception Configuration
+
+Create `codeception.yml`:
+
+```yaml
+paths:
+    tests: Tests/Acceptance
+    output: var/log/acceptance
+    data: Tests/Acceptance/_data
+    support: Tests/Acceptance/_support
+    envs: Tests/Acceptance/_envs
+
+actor_suffix: Tester
+
+extensions:
+    enabled:
+        - Codeception\Extension\RunFailed
+
+params:
+    - .env.testing
+
+suites:
+    acceptance:
+        actor: AcceptanceTester
+        modules:
+            enabled:
+                - WebDriver:
+                    url: http://web:8000
+                    browser: chrome
+                    host: selenium
+                    port: 4444
+                - \\Helper\\Acceptance
+```
+
+## Test Structure
+
+### Basic Test (Cest)
+
+```php
+<?php
+
+declare(strict_types=1);
+
+namespace Vendor\Extension\Tests\Acceptance;
+
+use Vendor\Extension\Tests\Acceptance\AcceptanceTester;
+
+final class LoginCest
+{
+    public function _before(AcceptanceTester $I): void
+    {
+        // Runs before each test
+        $I->amOnPage('/');
+    }
+
+    public function loginAsBackendUser(AcceptanceTester $I): void
+    {
+        $I->amOnPage('/typo3');
+        $I->fillField('username', 'admin');
+        $I->fillField('password', 'password');
+        $I->click('Login');
+
+        $I->see('Dashboard');
+        $I->seeInCurrentUrl('/typo3/module/dashboard');
+    }
+
+    public function loginFailsWithWrongPassword(AcceptanceTester $I): void
+    {
+        $I->amOnPage('/typo3');
+        $I->fillField('username', 'admin');
+        $I->fillField('password', 'wrong_password');
+        $I->click('Login');
+
+        $I->see('Login error');
+        $I->seeInCurrentUrl('/typo3');
+    }
+}
+```
+
+### Page Objects Pattern
+
+Create reusable page objects:
+
+```php
+<?php
+
+declare(strict_types=1);
+
+namespace Vendor\Extension\Tests\Acceptance\PageObject;
+
+use Vendor\Extension\Tests\Acceptance\AcceptanceTester;
+
+final class LoginPage
+{
+    public static string $URL = '/typo3';
+
+    public static string $usernameField = '#username';
+    public static string $passwordField = '#password';
+    public static string $loginButton = 'button[type="submit"]';
+
+    private AcceptanceTester $tester;
+
+    public function __construct(AcceptanceTester $I)
+    {
+        $this->tester = $I;
+    }
+
+    public function login(string $username, string $password): void
+    {
+        $I = $this->tester;
+
+        $I->amOnPage(self::$URL);
+        $I->fillField(self::$usernameField, $username);
+        $I->fillField(self::$passwordField, $password);
+        $I->click(self::$loginButton);
+    }
+}
+```
+
+Use page object in test:
+
+```php
+public function loginWithPageObject(AcceptanceTester $I): void
+{
+    $loginPage = new LoginPage($I);
+    $loginPage->login('admin', 'password');
+
+    $I->see('Dashboard');
+}
+```
+
+## Common Actions
+
+### Navigation
+
+```php
+// Navigate to URL
+$I->amOnPage('/products');
+$I->amOnUrl('https://example.com/page');
+
+// Click links
+$I->click('Products');
+$I->click('#menu-products');
+$I->click(['link' => 'View Details']);
+```
+
+### Form Interaction
+
+```php
+// Fill fields
+$I->fillField('email', 'user@example.com');
+$I->fillField('#password', 'secret');
+
+// Select options
+$I->selectOption('country', 'Germany');
+$I->selectOption('category', ['Books', 'Electronics']);
+
+// Checkboxes and radio buttons
+$I->checkOption('terms');
+$I->uncheckOption('newsletter');
+
+// Submit forms
+$I->submitForm('#contact-form', [
+    'name' => 'John Doe',
+    'email' => 'john@example.com',
+]);
+```
+
+### Assertions
+
+```php
+// See text
+$I->see('Welcome');
+$I->see('Product added', '.success-message');
+$I->dontSee('Error');
+
+// See elements
+$I->seeElement('.product-list');
+$I->seeElement('#add-to-cart');
+$I->dontSeeElement('.error-message');
+
+// URL checks
+$I->seeInCurrentUrl('/checkout');
+$I->seeCurrentUrlEquals('/thank-you');
+
+// Field values
+$I->seeInField('email', 'user@example.com');
+
+// Number of elements
+$I->seeNumberOfElements('.product-item', 10);
+```
+
+### JavaScript
+
+```php
+// Execute JavaScript
+$I->executeJS('window.scrollTo(0, document.body.scrollHeight);');
+
+// Wait for JavaScript
+$I->waitForJS('return document.readyState === "complete"', 5);
+
+// Wait for element
+$I->waitForElement('.product-list', 10);
+$I->waitForElementVisible('#modal', 5);
+
+// AJAX requests
+$I->waitForAjaxLoad();
+```
+
+### Screenshots
+
+```php
+// Take screenshot
+$I->makeScreenshot('product_page');
+
+// Screenshot on failure (automatic in codeception.yml)
+$I->makeScreenshot('FAILED_' . $test->getName());
+```
+
+## Data Management
+
+### Using Fixtures
+
+```php
+public function _before(AcceptanceTester $I): void
+{
+    // Reset database
+    $I->resetDatabase();
+
+    // Import fixtures
+    $I->importFixture('products.sql');
+}
+```
+
+### Test Data
+
+Create data providers:
+
+```php
+protected function productData(): array
+{
+    return [
+        ['name' => 'Product A', 'price' => 10.00],
+        ['name' => 'Product B', 'price' => 20.00],
+    ];
+}
+
+/**
+ * @dataProvider productData
+ */
+public function createsProduct(AcceptanceTester $I, \Codeception\Example $example): void
+{
+    $I->amOnPage('/admin/products/new');
+    $I->fillField('name', $example['name']);
+    $I->fillField('price', $example['price']);
+    $I->click('Save');
+
+    $I->see($example['name']);
+}
+```
+
+## Browser Configuration
+
+### Multiple Browsers
+
+```yaml
+# codeception.yml
+suites:
+    acceptance:
+        modules:
+            config:
+                WebDriver:
+                    browser: '%BROWSER%'
+
+# Run with different browsers
+BROWSER=chrome vendor/bin/codecept run acceptance
+BROWSER=firefox vendor/bin/codecept run acceptance
+```
+
+### Headless Mode
+
+```yaml
+WebDriver:
+    capabilities:
+        chromeOptions:
+            args: ['--headless', '--no-sandbox', '--disable-gpu']
+```
+
+## Running Tests
+
+### Basic Execution
+
+```bash
+# All acceptance tests
+vendor/bin/codecept run acceptance
+
+# Specific test
+vendor/bin/codecept run acceptance LoginCest
+
+# Specific method
+vendor/bin/codecept run acceptance LoginCest:loginAsBackendUser
+
+# With HTML report
+vendor/bin/codecept run acceptance --html
+```
+
+### Via runTests.sh
+
+```bash
+Build/Scripts/runTests.sh -s acceptance
+```
+
+### With Docker Compose
+
+```bash
+# Start services
+docker-compose -f Build/docker-compose.yml up -d
+
+# Run tests
+vendor/bin/codecept run acceptance
+
+# Stop services
+docker-compose -f Build/docker-compose.yml down
+```
+
+## Best Practices
+
+1. **Use Page Objects**: Reusable page representations
+2. **Wait Strategically**: Use `waitFor*` methods for dynamic content
+3. **Independent Tests**: Each test can run standalone
+4. **Descriptive Names**: Clear test method names
+5. **Screenshot on Failure**: Automatic debugging aid
+6. **Minimal Setup**: Only necessary fixtures and data
+7. **Stable Selectors**: Use IDs or data attributes, not fragile CSS
+
+## Common Pitfalls
+
+❌ **No Waits for Dynamic Content**
+```php
+$I->click('Load More');
+$I->see('Product 11'); // May fail if AJAX is slow
+```
+
+✅ **Proper Waits**
+```php
+$I->click('Load More');
+$I->waitForElement('.product-item:nth-child(11)', 5);
+$I->see('Product 11');
+```
+
+❌ **Brittle Selectors**
+```php
+$I->click('div.container > div:nth-child(3) > button'); // Fragile
+```
+
+✅ **Stable Selectors**
+```php
+$I->click('[data-test="add-to-cart"]'); // Stable
+$I->click('#product-add-button'); // Better
+```
+
+❌ **Large Test Scenarios**
+```php
+// Don't test entire user journey in one test
+public function completeUserJourney() { /* 50 steps */ }
+```
+
+✅ **Focused Tests**
+```php
+public function addsProductToCart() { /* 5 steps */ }
+public function proceedsToCheckout() { /* 7 steps */ }
+```
+
+## Debugging
+
+### Interactive Mode
+
+```bash
+vendor/bin/codecept run acceptance --debug
+vendor/bin/codecept run acceptance --steps
+```
+
+### Pause Execution
+
+```php
+$I->pauseExecution(); // Opens interactive shell
+```
+
+### HTML Reports
+
+```bash
+vendor/bin/codecept run acceptance --html
+# View report at Tests/Acceptance/_output/report.html
+```
+
+## Resources
+
+- [Codeception Documentation](https://codeception.com/docs/)
+- [WebDriver Module](https://codeception.com/docs/modules/WebDriver)
+- [Page Objects](https://codeception.com/docs/06-ReusingTestCode#pageobjects)
+- [TYPO3 Acceptance Testing](https://docs.typo3.org/m/typo3/reference-coreapi/main/en-us/Testing/AcceptanceTests.html)
--- a/references/ci-cd.md
+++ b/references/ci-cd.md
@@ -0,0 +1,523 @@
+# CI/CD Integration for TYPO3 Testing
+
+Continuous Integration and Continuous Deployment workflows for automated TYPO3 extension testing.
+
+## GitHub Actions
+
+### Basic Workflow
+
+Create `.github/workflows/tests.yml`:
+
+```yaml
+name: Tests
+
+on:
+  push:
+    branches: [ main, develop ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  lint:
+    name: Lint PHP
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.4'
+
+      - name: Install dependencies
+        run: composer install --no-progress
+
+      - name: Run linting
+        run: composer ci:test:php:lint
+
+  phpstan:
+    name: PHPStan
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.4'
+
+      - name: Install dependencies
+        run: composer install --no-progress
+
+      - name: Run PHPStan
+        run: composer ci:test:php:phpstan
+
+  unit:
+    name: Unit Tests
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php: ['8.1', '8.2', '8.3', '8.4']
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup PHP ${{ matrix.php }}
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          coverage: xdebug
+
+      - name: Install dependencies
+        run: composer install --no-progress
+
+      - name: Run unit tests
+        run: composer ci:test:php:unit
+
+      - name: Upload coverage
+        # Upload coverage for all PHP versions
+        uses: codecov/codecov-action@v3
+
+  functional:
+    name: Functional Tests
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php: ['8.1', '8.2', '8.3', '8.4']
+        database: ['mysqli', 'pdo_mysql', 'postgres', 'sqlite']
+
+    services:
+      mysql:
+        image: mysql:8.0
+        env:
+          MYSQL_ROOT_PASSWORD: root
+          MYSQL_DATABASE: typo3_test
+        ports:
+          - 3306:3306
+        options: >-
+          --health-cmd="mysqladmin ping"
+          --health-interval=10s
+          --health-timeout=5s
+          --health-retries=3
+
+      postgres:
+        image: postgres:15
+        env:
+          POSTGRES_PASSWORD: postgres
+          POSTGRES_DB: typo3_test
+        ports:
+          - 5432:5432
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup PHP ${{ matrix.php }}
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          extensions: ${{ matrix.database == 'postgres' && 'pdo_pgsql' || 'mysqli' }}
+
+      - name: Install dependencies
+        run: composer install --no-progress
+
+      - name: Run functional tests
+        run: |
+          export typo3DatabaseDriver=${{ matrix.database }}
+          export typo3DatabaseHost=127.0.0.1
+          export typo3DatabaseName=typo3_test
+          export typo3DatabaseUsername=${{ matrix.database == 'postgres' && 'postgres' || 'root' }}
+          export typo3DatabasePassword=${{ matrix.database == 'postgres' && 'postgres' || 'root' }}
+          composer ci:test:php:functional
+```
+
+### Matrix Strategy
+
+Test multiple PHP and TYPO3 versions:
+
+```yaml
+strategy:
+  fail-fast: false
+  matrix:
+    php: ['8.1', '8.2', '8.3', '8.4']
+    typo3: ['12.4', '13.0']
+    exclude:
+      - php: '8.1'
+        typo3: '13.0'  # TYPO3 v13 requires PHP 8.2+
+
+steps:
+  - name: Install TYPO3 v${{ matrix.typo3 }}
+    run: |
+      composer require "typo3/cms-core:^${{ matrix.typo3 }}" --no-update
+      composer update --no-progress
+```
+
+### Caching Dependencies
+
+```yaml
+- name: Cache Composer dependencies
+  uses: actions/cache@v3
+  with:
+    path: ~/.composer/cache
+    key: composer-${{ runner.os }}-${{ matrix.php }}-${{ hashFiles('composer.lock') }}
+    restore-keys: |
+      composer-${{ runner.os }}-${{ matrix.php }}-
+      composer-${{ runner.os }}-
+
+- name: Install dependencies
+  run: composer install --no-progress --prefer-dist
+```
+
+### Code Coverage
+
+```yaml
+- name: Run tests with coverage
+  run: vendor/bin/phpunit -c Build/phpunit/UnitTests.xml --coverage-clover coverage.xml
+
+- name: Upload coverage to Codecov
+  uses: codecov/codecov-action@v3
+  with:
+    file: ./coverage.xml
+    flags: unittests
+    name: codecov-umbrella
+```
+
+## GitLab CI
+
+### Basic Pipeline
+
+Create `.gitlab-ci.yml`:
+
+```yaml
+variables:
+  COMPOSER_CACHE_DIR: ".composer-cache"
+  MYSQL_ROOT_PASSWORD: "root"
+  MYSQL_DATABASE: "typo3_test"
+
+cache:
+  key: "$CI_COMMIT_REF_SLUG"
+  paths:
+    - .composer-cache/
+
+stages:
+  - lint
+  - analyze
+  - test
+
+.php:
+  image: php:${PHP_VERSION}-cli
+  before_script:
+    - apt-get update && apt-get install -y git zip unzip
+    - curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
+    - composer install --no-progress
+
+lint:
+  extends: .php
+  stage: lint
+  variables:
+    PHP_VERSION: "8.2"
+  script:
+    - composer ci:test:php:lint
+
+phpstan:
+  extends: .php
+  stage: analyze
+  variables:
+    PHP_VERSION: "8.2"
+  script:
+    - composer ci:test:php:phpstan
+
+cgl:
+  extends: .php
+  stage: analyze
+  variables:
+    PHP_VERSION: "8.2"
+  script:
+    - composer ci:test:php:cgl
+
+unit:8.1:
+  extends: .php
+  stage: test
+  variables:
+    PHP_VERSION: "8.1"
+  script:
+    - composer ci:test:php:unit
+
+unit:8.2:
+  extends: .php
+  stage: test
+  variables:
+    PHP_VERSION: "8.2"
+  script:
+    - composer ci:test:php:unit
+  coverage: '/^\s*Lines:\s*\d+.\d+\%/'
+  artifacts:
+    reports:
+      coverage_report:
+        coverage_format: cobertura
+        path: coverage.xml
+
+functional:8.2:
+  extends: .php
+  stage: test
+  variables:
+    PHP_VERSION: "8.2"
+    typo3DatabaseDriver: "mysqli"
+    typo3DatabaseHost: "mysql"
+    typo3DatabaseName: "typo3_test"
+    typo3DatabaseUsername: "root"
+    typo3DatabasePassword: "root"
+  services:
+    - mysql:8.0
+  script:
+    - composer ci:test:php:functional
+```
+
+### Multi-Database Testing
+
+```yaml
+.functional:
+  extends: .php
+  stage: test
+  variables:
+    PHP_VERSION: "8.2"
+  script:
+    - composer ci:test:php:functional
+
+functional:mysql:
+  extends: .functional
+  variables:
+    typo3DatabaseDriver: "mysqli"
+    typo3DatabaseHost: "mysql"
+    typo3DatabaseName: "typo3_test"
+    typo3DatabaseUsername: "root"
+    typo3DatabasePassword: "root"
+  services:
+    - mysql:8.0
+
+functional:postgres:
+  extends: .functional
+  variables:
+    typo3DatabaseDriver: "pdo_pgsql"
+    typo3DatabaseHost: "postgres"
+    typo3DatabaseName: "typo3_test"
+    typo3DatabaseUsername: "postgres"
+    typo3DatabasePassword: "postgres"
+  services:
+    - postgres:15
+  before_script:
+    - apt-get update && apt-get install -y libpq-dev
+    - docker-php-ext-install pdo_pgsql
+
+functional:sqlite:
+  extends: .functional
+  variables:
+    typo3DatabaseDriver: "pdo_sqlite"
+```
+
+## Best Practices
+
+### 1. Fast Feedback Loop
+
+Order jobs by execution time (fastest first):
+
+```yaml
+stages:
+  - lint        # ~30 seconds
+  - analyze     # ~1-2 minutes (PHPStan, CGL)
+  - unit        # ~2-5 minutes
+  - functional  # ~5-15 minutes
+  - acceptance  # ~15-30 minutes
+```
+
+### 2. Fail Fast
+
+```yaml
+strategy:
+  fail-fast: true  # Stop on first failure
+  matrix:
+    php: ['8.1', '8.2', '8.3', '8.4']
+```
+
+### 3. Parallel Execution
+
+```yaml
+# GitHub Actions - parallel jobs
+jobs:
+  lint: ...
+  phpstan: ...
+  unit: ...
+  # All run in parallel
+
+# GitLab CI - parallel jobs
+test:
+  parallel:
+    matrix:
+      - PHP_VERSION: ['8.1', '8.2', '8.3']
+```
+
+### 4. Cache Dependencies
+
+GitHub Actions:
+```yaml
+- uses: actions/cache@v3
+  with:
+    path: ~/.composer/cache
+    key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+```
+
+GitLab CI:
+```yaml
+cache:
+  key: ${CI_COMMIT_REF_SLUG}
+  paths:
+    - .composer-cache/
+```
+
+### 5. Matrix Testing
+
+Test critical combinations:
+
+```yaml
+strategy:
+  matrix:
+    include:
+      # Minimum supported versions
+      - php: '8.1'
+        typo3: '12.4'
+
+      # Current stable
+      - php: '8.2'
+        typo3: '12.4'
+
+      # Latest versions
+      - php: '8.3'
+        typo3: '13.0'
+```
+
+### 6. Artifacts and Reports
+
+```yaml
+- name: Archive test results
+  if: failure()
+  uses: actions/upload-artifact@v3
+  with:
+    name: test-results
+    path: |
+      var/log/
+      typo3temp/var/tests/
+```
+
+### 7. Notifications
+
+GitHub Actions:
+```yaml
+- name: Slack Notification
+  if: failure()
+  uses: rtCamp/action-slack-notify@v2
+  env:
+    SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
+```
+
+## Quality Gates
+
+### Required Checks
+
+Define which checks must pass:
+
+GitHub:
+```yaml
+# .github/branch-protection.json
+{
+  "required_status_checks": {
+    "strict": true,
+    "contexts": [
+      "lint",
+      "phpstan",
+      "unit (8.2)",
+      "functional (8.2, mysqli)"
+    ]
+  }
+}
+```
+
+GitLab:
+```yaml
+# .gitlab-ci.yml
+unit:8.2:
+  only:
+    - merge_requests
+  allow_failure: false  # Required check
+```
+
+### Coverage Requirements
+
+```yaml
+- name: Check code coverage
+  run: |
+    coverage=$(vendor/bin/phpunit --coverage-text | grep "Lines:" | awk '{print $2}' | sed 's/%//')
+    if (( $(echo "$coverage < 80" | bc -l) )); then
+      echo "Coverage $coverage% is below 80%"
+      exit 1
+    fi
+```
+
+## Environment-Specific Configuration
+
+### Development Branch
+
+```yaml
+on:
+  push:
+    branches: [ develop ]
+
+# Run all checks, allow failures
+jobs:
+  experimental:
+    continue-on-error: true
+    strategy:
+      matrix:
+        php: ['8.4']  # Experimental PHP version
+```
+
+### Production Branch
+
+```yaml
+on:
+  push:
+    branches: [ main ]
+
+# Strict checks only
+jobs:
+  tests:
+    strategy:
+      fail-fast: true
+      matrix:
+        php: ['8.2']  # LTS version only
+```
+
+### Pull Requests
+
+```yaml
+on:
+  pull_request:
+
+# Full test matrix
+jobs:
+  tests:
+    strategy:
+      matrix:
+        php: ['8.1', '8.2', '8.3', '8.4']
+        database: ['mysqli', 'postgres']
+```
+
+## Resources
+
+- [GitHub Actions Documentation](https://docs.github.com/actions)
+- [GitLab CI Documentation](https://docs.gitlab.com/ee/ci/)
+- [TYPO3 Tea Extension CI](https://github.com/TYPO3BestPractices/tea/tree/main/.github/workflows)
+- [shivammathur/setup-php](https://github.com/shivammathur/setup-php)
--- a/references/functional-testing.md
+++ b/references/functional-testing.md
@@ -0,0 +1,720 @@
+# Functional Testing in TYPO3
+
+Functional tests verify components that interact with external systems like databases, using a full TYPO3 instance.
+
+## When to Use Functional Tests
+
+- Testing database operations (repositories, queries)
+- Controller and plugin functionality
+- Hook and event implementations
+- DataHandler operations
+- File and folder operations
+- Extension configuration behavior
+
+## Base Class
+
+All functional tests extend `TYPO3\TestingFramework\Core\Functional\FunctionalTestCase`:
+
+```php
+<?php
+
+declare(strict_types=1);
+
+namespace Vendor\Extension\Tests\Functional\Domain\Repository;
+
+use TYPO3\TestingFramework\Core\Functional\FunctionalTestCase;
+use Vendor\Extension\Domain\Model\Product;
+use Vendor\Extension\Domain\Repository\ProductRepository;
+
+final class ProductRepositoryTest extends FunctionalTestCase
+{
+    protected ProductRepository $subject;
+
+    protected array $testExtensionsToLoad = [
+        'typo3conf/ext/my_extension',
+    ];
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+        $this->subject = $this->get(ProductRepository::class);
+    }
+
+    /**
+     * @test
+     */
+    public function findsProductsByCategory(): void
+    {
+        $this->importCSVDataSet(__DIR__ . '/../Fixtures/Products.csv');
+
+        $products = $this->subject->findByCategory(1);
+
+        self::assertCount(3, $products);
+    }
+}
+```
+
+## Test Database
+
+Functional tests use an isolated test database:
+
+- Created before test execution
+- Populated with fixtures
+- Destroyed after test completion
+- Supports: MySQL, MariaDB, PostgreSQL, SQLite
+
+### Database Configuration
+
+Set via environment or `FunctionalTests.xml`:
+
+```xml
+<php>
+    <env name="typo3DatabaseDriver" value="mysqli"/>
+    <env name="typo3DatabaseHost" value="localhost"/>
+    <env name="typo3DatabasePort" value="3306"/>
+    <env name="typo3DatabaseUsername" value="root"/>
+    <env name="typo3DatabasePassword" value=""/>
+    <env name="typo3DatabaseName" value="typo3_test"/>
+</php>
+```
+
+## Database Fixtures
+
+### CSV Format
+
+Create fixtures in `Tests/Functional/Fixtures/`:
+
+```csv
+# pages.csv
+uid,pid,title,doktype
+1,0,"Root",1
+2,1,"Products",1
+3,1,"Services",1
+```
+
+```csv
+# tx_myext_domain_model_product.csv
+uid,pid,title,price,category
+1,2,"Product A",10.00,1
+2,2,"Product B",20.00,1
+3,2,"Product C",15.00,2
+```
+
+### Import Fixtures
+
+```php
+/**
+ * @test
+ */
+public function findsProducts(): void
+{
+    // Import fixture
+    $this->importCSVDataSet(__DIR__ . '/../Fixtures/Products.csv');
+
+    // Test repository
+    $products = $this->subject->findAll();
+
+    self::assertCount(3, $products);
+}
+```
+
+### Multiple Fixtures
+
+```php
+protected function setUp(): void
+{
+    parent::setUp();
+
+    // Import common fixtures
+    $this->importCSVDataSet(__DIR__ . '/../Fixtures/pages.csv');
+    $this->importCSVDataSet(__DIR__ . '/../Fixtures/be_users.csv');
+
+    $this->subject = $this->get(ProductRepository::class);
+}
+```
+
+## Dependency Injection
+
+Use `$this->get()` to retrieve services:
+
+```php
+protected function setUp(): void
+{
+    parent::setUp();
+
+    // Get service from container
+    $this->subject = $this->get(ProductRepository::class);
+    $this->dataMapper = $this->get(DataMapper::class);
+}
+```
+
+## Testing Extensions
+
+### Load Test Extensions
+
+```php
+protected array $testExtensionsToLoad = [
+    'typo3conf/ext/my_extension',
+    'typo3conf/ext/dependency_extension',
+];
+```
+
+### Core Extensions
+
+```php
+protected array $coreExtensionsToLoad = [
+    'form',
+    'workspaces',
+];
+```
+
+## Site Configuration
+
+Create site configuration for frontend tests:
+
+```php
+protected function setUp(): void
+{
+    parent::setUp();
+
+    $this->importCSVDataSet(__DIR__ . '/../Fixtures/pages.csv');
+
+    $this->writeSiteConfiguration(
+        'test',
+        [
+            'rootPageId' => 1,
+            'base' => 'http://localhost/',
+        ]
+    );
+}
+```
+
+## Frontend Requests
+
+Test frontend rendering:
+
+```php
+use TYPO3\TestingFramework\Core\Functional\Framework\Frontend\InternalRequest;
+
+/**
+ * @test
+ */
+public function rendersProductList(): void
+{
+    $this->importCSVDataSet(__DIR__ . '/../Fixtures/pages.csv');
+    $this->importCSVDataSet(__DIR__ . '/../Fixtures/Products.csv');
+
+    $this->writeSiteConfiguration('test', ['rootPageId' => 1]);
+
+    $response = $this->executeFrontendSubRequest(
+        new InternalRequest('http://localhost/products')
+    );
+
+    self::assertStringContainsString('Product A', (string)$response->getBody());
+}
+```
+
+## Testing DataHandler Hooks (SC_OPTIONS)
+
+Test DataHandler SC_OPTIONS hook integration with real framework:
+
+```php
+<?php
+
+declare(strict_types=1);
+
+namespace Vendor\Extension\Tests\Functional\Database;
+
+use TYPO3\CMS\Core\DataHandling\DataHandler;
+use TYPO3\TestingFramework\Core\Functional\FunctionalTestCase;
+use Vendor\Extension\Database\MyDataHandlerHook;
+
+final class MyDataHandlerHookTest extends FunctionalTestCase
+{
+    protected array $testExtensionsToLoad = [
+        'typo3conf/ext/my_extension',
+    ];
+
+    protected array $coreExtensionsToLoad = [
+        'typo3/cms-rte-ckeditor', // If testing RTE-related hooks
+    ];
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->importCSVDataSet(__DIR__ . '/Fixtures/pages.csv');
+        $this->importCSVDataSet(__DIR__ . '/Fixtures/tt_content.csv');
+    }
+
+    private function createSubject(): MyDataHandlerHook
+    {
+        // Get services from container with proper DI
+        return new MyDataHandlerHook(
+            $this->get(ExtensionConfiguration::class),
+            $this->get(LogManager::class),
+            $this->get(ResourceFactory::class),
+        );
+    }
+
+    /**
+     * @test
+     */
+    public function processDatamapPostProcessFieldArrayHandlesRteField(): void
+    {
+        $subject = $this->createSubject();
+
+        $status     = 'update';
+        $table      = 'tt_content';
+        $id         = '1';
+        $fieldArray = [
+            'bodytext' => '<p>Test content with <img src="image.jpg" /></p>',
+        ];
+
+        /** @var DataHandler $dataHandler */
+        $dataHandler = $this->get(DataHandler::class);
+
+        // Configure TCA for RTE field
+        /** @var array<string, mixed> $tcaConfig */
+        $tcaConfig = [
+            'type'           => 'text',
+            'enableRichtext' => true,
+        ];
+        // @phpstan-ignore-next-line offsetAccess.nonOffsetAccessible
+        $GLOBALS['TCA']['tt_content']['columns']['bodytext']['config'] = $tcaConfig;
+
+        $subject->processDatamap_postProcessFieldArray(
+            $status,
+            $table,
+            $id,
+            $fieldArray,
+            $dataHandler,
+        );
+
+        // Field should be processed by hook
+        self::assertArrayHasKey('bodytext', $fieldArray);
+        self::assertIsString($fieldArray['bodytext']);
+        self::assertNotEmpty($fieldArray['bodytext']);
+        self::assertStringContainsString('Test content', $fieldArray['bodytext']);
+    }
+
+    /**
+     * @test
+     */
+    public function hookIsRegisteredInGlobals(): void
+    {
+        // Verify hook is properly registered in TYPO3_CONF_VARS
+        self::assertIsArray($GLOBALS['TYPO3_CONF_VARS']);
+        self::assertArrayHasKey('SC_OPTIONS', $GLOBALS['TYPO3_CONF_VARS']);
+
+        $scOptions = $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS'];
+        self::assertIsArray($scOptions);
+        self::assertArrayHasKey('t3lib/class.t3lib_tcemain.php', $scOptions);
+
+        $tcemainOptions = $scOptions['t3lib/class.t3lib_tcemain.php'];
+        self::assertIsArray($tcemainOptions);
+        self::assertArrayHasKey('processDatamapClass', $tcemainOptions);
+
+        $registeredHooks = $tcemainOptions['processDatamapClass'];
+        self::assertIsArray($registeredHooks);
+
+        // Hook class should be registered
+        self::assertContains(MyDataHandlerHook::class, $registeredHooks);
+    }
+}
+```
+
+### Key Patterns for DataHandler Hook Testing
+
+1. **Use Factory Method Pattern**: Create `createSubject()` method to avoid uninitialized property PHPStan errors
+2. **Test Real Framework Integration**: Don't mock DataHandler, test actual hook execution
+3. **Configure TCA Dynamically**: Set up `$GLOBALS['TCA']` in tests for field configuration
+4. **Verify Hook Registration**: Test that hooks are properly registered in `$GLOBALS['TYPO3_CONF_VARS']`
+5. **Test Multiple Scenarios**: new vs update, single vs multiple fields, RTE vs non-RTE
+
+## Testing File Abstraction Layer (FAL)
+
+Test ResourceFactory and FAL storage integration:
+
+```php
+<?php
+
+declare(strict_types=1);
+
+namespace Vendor\Extension\Tests\Functional\Controller;
+
+use TYPO3\CMS\Core\Resource\File;
+use TYPO3\CMS\Core\Resource\Folder;
+use TYPO3\CMS\Core\Resource\ResourceFactory;
+use TYPO3\CMS\Core\Resource\ResourceStorage;
+use TYPO3\TestingFramework\Core\Functional\FunctionalTestCase;
+use Vendor\Extension\Controller\ImageRenderingController;
+
+final class ImageRenderingControllerTest extends FunctionalTestCase
+{
+    protected array $testExtensionsToLoad = [
+        'typo3conf/ext/my_extension',
+    ];
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->importCSVDataSet(__DIR__ . '/Fixtures/sys_file_storage.csv');
+        $this->importCSVDataSet(__DIR__ . '/Fixtures/sys_file.csv');
+    }
+
+    /**
+     * @test
+     */
+    public function storageIsAccessible(): void
+    {
+        /** @var ResourceFactory $resourceFactory */
+        $resourceFactory = $this->get(ResourceFactory::class);
+        $storage         = $resourceFactory->getStorageObject(1);
+
+        self::assertInstanceOf(ResourceStorage::class, $storage);
+        self::assertTrue($storage->isOnline());
+    }
+
+    /**
+     * @test
+     */
+    public function canRetrieveFileFromStorage(): void
+    {
+        /** @var ResourceFactory $resourceFactory */
+        $resourceFactory = $this->get(ResourceFactory::class);
+
+        // Get file from test data
+        $file = $resourceFactory->getFileObject(1);
+
+        self::assertInstanceOf(File::class, $file);
+        self::assertSame('test-image.jpg', $file->getName());
+    }
+
+    /**
+     * @test
+     */
+    public function canAccessStorageRootFolder(): void
+    {
+        /** @var ResourceFactory $resourceFactory */
+        $resourceFactory = $this->get(ResourceFactory::class);
+        $storage         = $resourceFactory->getStorageObject(1);
+
+        $rootFolder = $storage->getRootLevelFolder();
+
+        self::assertInstanceOf(Folder::class, $rootFolder);
+        self::assertSame('/', $rootFolder->getIdentifier());
+    }
+}
+```
+
+### FAL Test Fixtures
+
+**sys_file_storage.csv:**
+```csv
+uid,pid,name,driver,configuration,is_default,is_browsable,is_public,is_writable,is_online
+1,0,"fileadmin","Local","<?xml version=""1.0"" encoding=""utf-8"" standalone=""yes"" ?><T3FlexForms><data><sheet index=""sDEF""><language index=""lDEF""><field index=""basePath""><value index=""vDEF"">fileadmin/</value></field><field index=""pathType""><value index=""vDEF"">relative</value></field><field index=""caseSensitive""><value index=""vDEF"">1</value></field></language></sheet></data></T3FlexForms>",1,1,1,1,1
+```
+
+**sys_file.csv:**
+```csv
+uid,pid,storage,identifier,name,type,mime_type,size,sha1,extension
+1,0,1,"/test-image.jpg","test-image.jpg",2,"image/jpeg",12345,"da39a3ee5e6b4b0d3255bfef95601890afd80709","jpg"
+```
+
+### Key Patterns for FAL Testing
+
+1. **Test Storage Configuration**: Verify storage is properly configured and online
+2. **Test File Retrieval**: Use `getFileObject()` to retrieve files from sys_file
+3. **Test Folder Operations**: Verify folder access and structure
+4. **Use CSV Fixtures**: Import sys_file_storage and sys_file test data
+5. **Test Real Services**: Use container's ResourceFactory, don't mock
+
+## PHPStan Type Safety in Functional Tests
+
+### Handling $GLOBALS['TCA'] with PHPStan Level 9
+
+PHPStan cannot infer types for runtime-configured `$GLOBALS` arrays. Use ignore annotations:
+
+```php
+// Configure TCA for RTE field
+/** @var array<string, mixed> $tcaConfig */
+$tcaConfig = [
+    'type'           => 'text',
+    'enableRichtext' => true,
+];
+// @phpstan-ignore-next-line offsetAccess.nonOffsetAccessible
+$GLOBALS['TCA']['tt_content']['columns']['bodytext']['config'] = $tcaConfig;
+```
+
+### Type Assertions for Dynamic Arrays
+
+When testing field arrays that are modified by reference:
+
+```php
+// ❌ PHPStan cannot verify this is still an array
+self::assertStringContainsString('Test', $fieldArray['bodytext']);
+
+// ✅ Add type assertions
+self::assertArrayHasKey('bodytext', $fieldArray);
+self::assertIsString($fieldArray['bodytext']);
+self::assertStringContainsString('Test', $fieldArray['bodytext']);
+```
+
+### Avoiding Uninitialized Property Errors
+
+Use factory methods instead of properties initialized in setUp():
+
+```php
+// ❌ PHPStan warns about uninitialized property
+private MyService $subject;
+
+protected function setUp(): void
+{
+    $this->subject = $this->get(MyService::class);
+}
+
+// ✅ Use factory method
+private function createSubject(): MyService
+{
+    return $this->get(MyService::class);
+}
+
+public function testSomething(): void
+{
+    $subject = $this->createSubject();
+    // Use $subject
+}
+```
+
+### PHPStan Annotations for Functional Tests
+
+Common patterns:
+
+```php
+// Ignore $GLOBALS access
+// @phpstan-ignore-next-line offsetAccess.nonOffsetAccessible
+$GLOBALS['TCA']['table']['columns']['field']['config'] = $config;
+
+// Type hint service retrieval
+/** @var DataHandler $dataHandler */
+$dataHandler = $this->get(DataHandler::class);
+
+// Type hint config arrays
+/** @var array<string, mixed> $tcaConfig */
+$tcaConfig = ['type' => 'text'];
+```
+
+## Backend User Context
+
+Test with backend user:
+
+```php
+use TYPO3\TestingFramework\Core\Functional\Framework\Frontend\InternalRequest;
+
+/**
+ * @test
+ */
+public function editorCanEditRecord(): void
+{
+    $this->importCSVDataSet(__DIR__ . '/../Fixtures/be_users.csv');
+    $this->importCSVDataSet(__DIR__ . '/../Fixtures/Products.csv');
+
+    $this->setUpBackendUser(1); // uid from be_users.csv
+
+    $dataHandler = $this->get(DataHandler::class);
+    $dataHandler->start(
+        [
+            'tx_myext_domain_model_product' => [
+                1 => ['title' => 'Updated Product']
+            ]
+        ],
+        []
+    );
+    $dataHandler->process_datamap();
+
+    self::assertEmpty($dataHandler->errorLog);
+}
+```
+
+## File Operations
+
+Test file handling:
+
+```php
+/**
+ * @test
+ */
+public function uploadsFile(): void
+{
+    $fileStorage = $this->get(StorageRepository::class)->getDefaultStorage();
+
+    $file = $fileStorage->addFile(
+        __DIR__ . '/../Fixtures/Files/test.jpg',
+        $fileStorage->getDefaultFolder(),
+        'test.jpg'
+    );
+
+    self::assertFileExists($file->getForLocalProcessing(false));
+}
+```
+
+## Configuration
+
+### PHPUnit XML (Build/phpunit/FunctionalTests.xml)
+
+```xml
+<phpunit
+    bootstrap="FunctionalTestsBootstrap.php"
+    cacheResult="false"
+    beStrictAboutTestsThatDoNotTestAnything="true"
+    failOnDeprecation="true"
+    failOnNotice="true"
+    failOnWarning="true">
+    <testsuites>
+        <testsuite name="Functional tests">
+            <directory>../../Tests/Functional/</directory>
+        </testsuite>
+    </testsuites>
+    <php>
+        <const name="TYPO3_TESTING_FUNCTIONAL_REMOVE_ERROR_HANDLER" value="true" />
+        <env name="TYPO3_CONTEXT" value="Testing"/>
+        <env name="typo3DatabaseDriver" value="mysqli"/>
+    </php>
+</phpunit>
+```
+
+### Bootstrap (Build/phpunit/FunctionalTestsBootstrap.php)
+
+```php
+<?php
+
+declare(strict_types=1);
+
+call_user_func(static function () {
+    $testbase = new \TYPO3\TestingFramework\Core\Testbase();
+    $testbase->defineOriginalRootPath();
+    $testbase->createDirectory(ORIGINAL_ROOT . 'typo3temp/var/tests');
+    $testbase->createDirectory(ORIGINAL_ROOT . 'typo3temp/var/transient');
+});
+```
+
+## Fixture Strategy
+
+### Minimal Fixtures
+
+Keep fixtures focused on test requirements:
+
+```php
+// ❌ Too much data
+$this->importCSVDataSet(__DIR__ . '/../Fixtures/AllProducts.csv'); // 500 records
+
+// ✅ Minimal test data
+$this->importCSVDataSet(__DIR__ . '/../Fixtures/ProductsByCategory.csv'); // 3 records
+```
+
+### Reusable Fixtures
+
+Create shared fixtures for common scenarios:
+
+```
+Tests/Functional/Fixtures/
+├── pages.csv              # Basic page tree
+├── be_users.csv           # Test backend users
+├── Products/
+│   ├── BasicProducts.csv  # 3 simple products
+│   ├── ProductsWithCategories.csv
+│   └── ProductsWithImages.csv
+```
+
+### Fixture Documentation
+
+Document fixture purpose in test or AGENTS.md:
+
+```php
+/**
+ * @test
+ */
+public function findsProductsByCategory(): void
+{
+    // Fixture contains: 3 products in category 1, 2 products in category 2
+    $this->importCSVDataSet(__DIR__ . '/../Fixtures/ProductsByCategory.csv');
+
+    $products = $this->subject->findByCategory(1);
+
+    self::assertCount(3, $products);
+}
+```
+
+## Best Practices
+
+1. **Use setUp() for Common Setup**: Import shared fixtures in setUp()
+2. **One Test Database**: Each test gets clean database instance
+3. **Test Isolation**: Don't depend on other test execution
+4. **Minimal Fixtures**: Only data required for specific test
+5. **Clear Assertions**: Test specific behavior, not implementation
+6. **Cleanup**: Testing framework handles cleanup automatically
+
+## Common Pitfalls
+
+❌ **Large Fixtures**
+```php
+// Don't import unnecessary data
+$this->importCSVDataSet('AllData.csv'); // 10,000 records
+```
+
+❌ **No Fixtures**
+```php
+// Don't expect data to exist
+$products = $this->subject->findAll();
+self::assertCount(0, $products); // Always true without fixtures
+```
+
+❌ **Missing Extensions**
+```php
+// Don't forget to load extension under test
+// Missing: protected array $testExtensionsToLoad = ['typo3conf/ext/my_extension'];
+```
+
+✅ **Focused, Well-Documented Tests**
+```php
+/**
+ * @test
+ */
+public function findsByCategory(): void
+{
+    // Fixture: 3 products in category 1
+    $this->importCSVDataSet(__DIR__ . '/../Fixtures/CategoryProducts.csv');
+
+    $products = $this->subject->findByCategory(1);
+
+    self::assertCount(3, $products);
+    self::assertSame('Product A', $products[0]->getTitle());
+}
+```
+
+## Running Functional Tests
+
+```bash
+# Via runTests.sh
+Build/Scripts/runTests.sh -s functional
+
+# Via PHPUnit directly
+vendor/bin/phpunit -c Build/phpunit/FunctionalTests.xml
+
+# Via Composer
+composer ci:test:php:functional
+
+# With specific database
+typo3DatabaseDriver=pdo_mysql vendor/bin/phpunit -c Build/phpunit/FunctionalTests.xml
+
+# Single test
+vendor/bin/phpunit Tests/Functional/Domain/Repository/ProductRepositoryTest.php
+```
+
+## Resources
+
+- [TYPO3 Functional Testing Documentation](https://docs.typo3.org/m/typo3/reference-coreapi/main/en-us/Testing/FunctionalTests.html)
+- [Testing Framework](https://github.com/typo3/testing-framework)
+- [CSV Fixture Format](https://docs.typo3.org/m/typo3/reference-coreapi/main/en-us/Testing/FunctionalTests.html#importing-data)
--- a/references/javascript-testing.md
+++ b/references/javascript-testing.md
@@ -0,0 +1,499 @@
+# JavaScript and CKEditor Testing
+
+**Purpose:** Testing patterns for TYPO3 CKEditor plugins, JavaScript functionality, and frontend code
+
+## Overview
+
+While TYPO3 extensions are primarily PHP, many include JavaScript for:
+- CKEditor custom plugins and features
+- Backend module interactions
+- Frontend enhancements
+- RTE (Rich Text Editor) extensions
+
+This guide covers testing patterns for JavaScript code in TYPO3 extensions.
+
+## CKEditor Plugin Testing
+
+### Testing Model Attributes
+
+CKEditor plugins define model attributes that must be properly handled through upcast (view→model) and downcast (model→view) conversions.
+
+**Example from t3x-rte_ckeditor_image:**
+
+The plugin added a `noScale` attribute to prevent image processing. This requires testing:
+
+1. **Attribute schema registration**
+2. **Upcast conversion** (HTML → CKEditor model)
+3. **Downcast conversion** (CKEditor model → HTML)
+4. **UI interaction** (dialog checkbox)
+
+### Test Structure Pattern
+
+```javascript
+// Resources/Public/JavaScript/Plugins/__tests__/typo3image.test.js
+
+import { typo3image } from '../typo3image';
+
+describe('TYPO3 Image Plugin', () => {
+    let editor;
+
+    beforeEach(async () => {
+        editor = await createTestEditor();
+    });
+
+    afterEach(() => {
+        return editor.destroy();
+    });
+
+    describe('Model Schema', () => {
+        it('should allow noScale attribute', () => {
+            const schema = editor.model.schema;
+            expect(schema.checkAttribute('typo3image', 'noScale')).toBe(true);
+        });
+    });
+
+    describe('Upcast Conversion', () => {
+        it('should read data-noscale from HTML', () => {
+            const html = '<img src="test.jpg" data-noscale="true" />';
+            editor.setData(html);
+
+            const imageElement = editor.model.document.getRoot()
+                .getChild(0);
+
+            expect(imageElement.getAttribute('noScale')).toBe(true);
+        });
+
+        it('should handle missing data-noscale attribute', () => {
+            const html = '<img src="test.jpg" />';
+            editor.setData(html);
+
+            const imageElement = editor.model.document.getRoot()
+                .getChild(0);
+
+            expect(imageElement.getAttribute('noScale')).toBe(false);
+        });
+    });
+
+    describe('Downcast Conversion', () => {
+        it('should write data-noscale to HTML when enabled', () => {
+            editor.model.change(writer => {
+                const imageElement = writer.createElement('typo3image', {
+                    src: 'test.jpg',
+                    noScale: true
+                });
+                writer.insert(imageElement, editor.model.document.getRoot(), 0);
+            });
+
+            const html = editor.getData();
+            expect(html).toContain('data-noscale="true"');
+        });
+
+        it('should omit data-noscale when disabled', () => {
+            editor.model.change(writer => {
+                const imageElement = writer.createElement('typo3image', {
+                    src: 'test.jpg',
+                    noScale: false
+                });
+                writer.insert(imageElement, editor.model.document.getRoot(), 0);
+            });
+
+            const html = editor.getData();
+            expect(html).not.toContain('data-noscale');
+        });
+    });
+});
+```
+
+### Testing data-* Attributes
+
+Many TYPO3 CKEditor plugins use `data-*` attributes to pass information from editor to server-side rendering.
+
+**Common Patterns:**
+
+```javascript
+describe('data-* Attribute Handling', () => {
+    it('should preserve TYPO3-specific attributes', () => {
+        const testCases = [
+            { attr: 'data-htmlarea-file-uid', value: '123' },
+            { attr: 'data-htmlarea-file-table', value: 'sys_file' },
+            { attr: 'data-htmlarea-zoom', value: 'true' },
+            { attr: 'data-noscale', value: 'true' },
+            { attr: 'data-alt-override', value: 'false' },
+            { attr: 'data-title-override', value: 'true' }
+        ];
+
+        testCases.forEach(({ attr, value }) => {
+            const html = `<img src="test.jpg" ${attr}="${value}" />`;
+            editor.setData(html);
+
+            // Verify upcast preserves attribute
+            const output = editor.getData();
+            expect(output).toContain(`${attr}="${value}"`);
+        });
+    });
+
+    it('should handle boolean data attributes', () => {
+        // Test true value
+        editor.setData('<img src="test.jpg" data-noscale="true" />');
+        let imageElement = editor.model.document.getRoot().getChild(0);
+        expect(imageElement.getAttribute('noScale')).toBe(true);
+
+        // Test false value
+        editor.setData('<img src="test.jpg" data-noscale="false" />');
+        imageElement = editor.model.document.getRoot().getChild(0);
+        expect(imageElement.getAttribute('noScale')).toBe(false);
+
+        // Test missing attribute
+        editor.setData('<img src="test.jpg" />');
+        imageElement = editor.model.document.getRoot().getChild(0);
+        expect(imageElement.getAttribute('noScale')).toBe(false);
+    });
+});
+```
+
+### Testing Dialog UI
+
+CKEditor dialogs require testing user interactions:
+
+```javascript
+describe('Image Dialog', () => {
+    let dialog, $checkbox;
+
+    beforeEach(() => {
+        dialog = createImageDialog(editor);
+        $checkbox = dialog.$el.find('#checkbox-noscale');
+    });
+
+    it('should display noScale checkbox', () => {
+        expect($checkbox.length).toBe(1);
+        expect($checkbox.parent('label').text())
+            .toContain('Use original file (noScale)');
+    });
+
+    it('should set noScale attribute when checkbox checked', () => {
+        $checkbox.prop('checked', true);
+        dialog.save();
+
+        const imageElement = getSelectedImage(editor);
+        expect(imageElement.getAttribute('noScale')).toBe(true);
+    });
+
+    it('should remove noScale attribute when checkbox unchecked', () => {
+        // Start with noScale enabled
+        const imageElement = getSelectedImage(editor);
+        editor.model.change(writer => {
+            writer.setAttribute('noScale', true, imageElement);
+        });
+
+        // Uncheck and save
+        $checkbox.prop('checked', false);
+        dialog.save();
+
+        expect(imageElement.getAttribute('noScale')).toBe(false);
+    });
+
+    it('should load checkbox state from existing attribute', () => {
+        const imageElement = getSelectedImage(editor);
+        editor.model.change(writer => {
+            writer.setAttribute('noScale', true, imageElement);
+        });
+
+        dialog = createImageDialog(editor);
+        $checkbox = dialog.$el.find('#checkbox-noscale');
+
+        expect($checkbox.prop('checked')).toBe(true);
+    });
+});
+```
+
+## JavaScript Test Frameworks
+
+### Jest (Recommended)
+
+**Installation:**
+```bash
+npm install --save-dev jest @babel/preset-env
+```
+
+**Configuration (jest.config.js):**
+```javascript
+module.exports = {
+    testEnvironment: 'jsdom',
+    transform: {
+        '^.+\\.js$': 'babel-jest'
+    },
+    moduleNameMapper: {
+        '\\.(css|less|scss)$': 'identity-obj-proxy'
+    },
+    collectCoverageFrom: [
+        'Resources/Public/JavaScript/**/*.js',
+        '!Resources/Public/JavaScript/**/*.test.js',
+        '!Resources/Public/JavaScript/**/__tests__/**'
+    ],
+    coverageThreshold: {
+        global: {
+            branches: 70,
+            functions: 70,
+            lines: 70,
+            statements: 70
+        }
+    }
+};
+```
+
+### Mocha + Chai
+
+Alternative for projects already using Mocha:
+
+```javascript
+// test/javascript/typo3image.test.js
+const { expect } = require('chai');
+const { JSDOM } = require('jsdom');
+
+describe('TYPO3 Image Plugin', function() {
+    let editor;
+
+    beforeEach(async function() {
+        const dom = new JSDOM('<!DOCTYPE html><html><body></body></html>');
+        global.window = dom.window;
+        global.document = window.document;
+
+        editor = await createTestEditor();
+    });
+
+    it('should handle noScale attribute', function() {
+        // Test implementation
+    });
+});
+```
+
+## Testing Best Practices
+
+### 1. Isolate Editor Instance
+
+Each test should use a fresh editor instance:
+
+```javascript
+async function createTestEditor() {
+    const div = document.createElement('div');
+    document.body.appendChild(div);
+
+    const editor = await ClassicEditor.create(div, {
+        plugins: [Typo3Image, /* other plugins */],
+        typo3image: {
+            /* plugin config */
+        }
+    });
+
+    return editor;
+}
+```
+
+### 2. Clean Up After Tests
+
+Prevent memory leaks and DOM pollution:
+
+```javascript
+afterEach(async () => {
+    if (editor) {
+        await editor.destroy();
+        editor = null;
+    }
+
+    // Clean up any test DOM elements
+    document.body.innerHTML = '';
+});
+```
+
+### 3. Test Both Happy Path and Edge Cases
+
+```javascript
+describe('Attribute Validation', () => {
+    it('should handle valid boolean values', () => {
+        // Happy path
+    });
+
+    it('should handle invalid attribute values', () => {
+        const html = '<img src="test.jpg" data-noscale="invalid" />';
+        editor.setData(html);
+
+        // Should default to false
+        const imageElement = editor.model.document.getRoot().getChild(0);
+        expect(imageElement.getAttribute('noScale')).toBe(false);
+    });
+
+    it('should handle malformed HTML', () => {
+        const html = '<img src="test.jpg" data-noscale>';  // Missing value
+        // Test graceful handling
+    });
+});
+```
+
+### 4. Mock Backend Interactions
+
+For plugins that communicate with TYPO3 backend:
+
+```javascript
+beforeEach(() => {
+    global.fetch = jest.fn(() =>
+        Promise.resolve({
+            json: () => Promise.resolve({ success: true })
+        })
+    );
+});
+
+afterEach(() => {
+    global.fetch.mockRestore();
+});
+
+it('should fetch image metadata from backend', async () => {
+    await plugin.fetchImageMetadata(123);
+
+    expect(fetch).toHaveBeenCalledWith(
+        '/typo3/ajax/image/metadata/123',
+        expect.any(Object)
+    );
+});
+```
+
+## Integration with PHP Tests
+
+JavaScript tests complement PHP unit tests:
+
+**PHP Side (Backend):**
+```php
+// Tests/Unit/Controller/ImageRenderingControllerTest.php
+public function testNoScaleAttribute(): void
+{
+    $attributes = ['data-noscale' => 'true'];
+    $result = $this->controller->render($attributes);
+
+    // Verify noScale parameter passed to imgResource
+    $this->assertStringContainsString('noScale=1', $result);
+}
+```
+
+**JavaScript Side (Frontend):**
+```javascript
+// Resources/Public/JavaScript/__tests__/typo3image.test.js
+it('should generate data-noscale attribute', () => {
+    // Verify attribute is created in editor
+    editor.model.change(writer => {
+        const img = writer.createElement('typo3image', {
+            noScale: true
+        });
+        writer.insert(img, editor.model.document.getRoot(), 0);
+    });
+
+    expect(editor.getData()).toContain('data-noscale="true"');
+});
+```
+
+**Together:** These tests ensure end-to-end functionality from editor UI → HTML attribute → PHP backend processing.
+
+## CI/CD Integration
+
+Add JavaScript tests to your CI pipeline:
+
+**package.json:**
+```json
+{
+    "scripts": {
+        "test": "jest",
+        "test:coverage": "jest --coverage",
+        "test:watch": "jest --watch"
+    },
+    "devDependencies": {
+        "jest": "^29.0.0",
+        "@babel/preset-env": "^7.20.0"
+    }
+}
+```
+
+**GitHub Actions:**
+```yaml
+- name: Run JavaScript tests
+  run: |
+    npm install
+    npm run test:coverage
+
+- name: Upload JS coverage
+  uses: codecov/codecov-action@v3
+  with:
+    files: ./coverage/lcov.info
+    flags: javascript
+```
+
+## Example: Complete Test Suite
+
+See `t3x-rte_ckeditor_image` for a real-world example:
+
+```
+t3x-rte_ckeditor_image/
+├── Resources/Public/JavaScript/
+│   └── Plugins/
+│       ├── typo3image.js              # Main plugin
+│       └── __tests__/
+│           └── typo3image.test.js     # JavaScript tests
+└── Tests/Unit/
+    └── Controller/
+        └── ImageRenderingControllerTest.php  # PHP tests
+```
+
+**Key Lessons:**
+1. Test attribute schema registration
+2. Test upcast/downcast conversions separately
+3. Test UI interactions (checkboxes, inputs)
+4. Test data-* attribute preservation
+5. Clean up editor instances to prevent leaks
+6. Mock backend API calls
+7. Coordinate with PHP tests for full coverage
+
+## Troubleshooting
+
+### Tests Pass Locally but Fail in CI
+
+**Cause:** DOM environment differences
+
+**Solution:**
+```javascript
+// jest.config.js
+module.exports = {
+    testEnvironment: 'jsdom',
+    testEnvironmentOptions: {
+        url: 'http://localhost'
+    }
+};
+```
+
+### Memory Leaks in Test Suite
+
+**Cause:** Editor instances not properly destroyed
+
+**Solution:**
+```javascript
+afterEach(async () => {
+    if (editor && !editor.state === 'destroyed') {
+        await editor.destroy();
+    }
+    editor = null;
+});
+```
+
+### Async Test Failures
+
+**Cause:** Not waiting for editor initialization
+
+**Solution:**
+```javascript
+beforeEach(async () => {
+    editor = await ClassicEditor.create(/* ... */);
+    // ☝️ await is critical
+});
+```
+
+## References
+
+- [CKEditor 5 Testing](https://ckeditor.com/docs/ckeditor5/latest/framework/guides/contributing/testing-environment.html)
+- [Jest Documentation](https://jestjs.io/docs/getting-started)
+- [TYPO3 RTE CKEditor Image](https://github.com/netresearch/t3x-rte_ckeditor_image)
--- a/references/quality-tools.md
+++ b/references/quality-tools.md
@@ -0,0 +1,395 @@
+# Quality Tools for TYPO3 Development
+
+Automated code quality and static analysis tools for TYPO3 extensions.
+
+## Overview
+
+- **PHPStan**: Static analysis for type safety and bugs
+- **Rector**: Automated code refactoring and modernization
+- **php-cs-fixer**: Code style enforcement (PSR-12, TYPO3 CGL)
+- **phplint**: PHP syntax validation
+
+## PHPStan
+
+### Installation
+
+```bash
+composer require --dev phpstan/phpstan phpstan/phpstan-strict-rules saschaegerer/phpstan-typo3
+```
+
+### Configuration
+
+Create `Build/phpstan.neon`:
+
+```neon
+includes:
+    - vendor/phpstan/phpstan-strict-rules/rules.neon
+    - vendor/saschaegerer/phpstan-typo3/extension.neon
+
+parameters:
+    level: max  # Level 10 - maximum strictness
+    paths:
+        - Classes
+        - Tests
+    excludePaths:
+        - Tests/Acceptance/_output/*
+    reportUnmatchedIgnoredErrors: true
+    checkGenericClassInNonGenericObjectType: false
+    checkMissingIterableValueType: false
+```
+
+### Running PHPStan
+
+```bash
+# Via runTests.sh
+Build/Scripts/runTests.sh -s phpstan
+
+# Directly
+vendor/bin/phpstan analyze --configuration Build/phpstan.neon
+
+# With baseline (ignore existing errors)
+vendor/bin/phpstan analyze --generate-baseline Build/phpstan-baseline.neon
+
+# Clear cache
+vendor/bin/phpstan clear-result-cache
+```
+
+### PHPStan Rule Levels
+
+**Level 0-10** (use `max` for level 10): Increasing strictness
+- **Level 0**: Basic checks (undefined variables, unknown functions)
+- **Level 5**: Type checks, unknown properties, unknown methods
+- **Level 9**: Strict mixed types, unused parameters
+- **Level 10 (max)**: Maximum strictness - explicit mixed types, pure functions
+
+**Recommendation**: Start with level 5, aim for level 10 (max) in modern TYPO3 13 projects.
+
+**Why Level 10?**
+- Enforces explicit type declarations (`mixed` must be declared, not implicit)
+- Catches more potential bugs at development time
+- Aligns with TYPO3 13 strict typing standards (`declare(strict_types=1)`)
+- Required for PHPStan Level 10 compliant extensions
+
+### Ignoring Errors
+
+```php
+/** @phpstan-ignore-next-line */
+$value = $this->legacyMethod();
+
+// Or in neon file
+parameters:
+    ignoreErrors:
+        - '#Call to an undefined method.*::getRepository\(\)#'
+```
+
+### TYPO3-Specific Rules
+
+```php
+// PHPStan understands TYPO3 classes
+$queryBuilder = GeneralUtility::makeInstance(ConnectionPool::class)
+    ->getQueryBuilderForTable('pages');
+// ✅ PHPStan knows this returns QueryBuilder
+
+// Detects TYPO3 API misuse
+TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(MyService::class);
+// ✅ Checks if MyService is a valid class
+```
+
+## Rector
+
+### Installation
+
+```bash
+composer require --dev rector/rector ssch/typo3-rector
+```
+
+### Configuration
+
+Create `rector.php`:
+
+```php
+<?php
+
+declare(strict_types=1);
+
+use Rector\Config\RectorConfig;
+use Rector\Set\ValueObject\LevelSetList;
+use Rector\Set\ValueObject\SetList;
+use Ssch\TYPO3Rector\Set\Typo3SetList;
+
+return RectorConfig::configure()
+    ->withPaths([
+        __DIR__ . '/Classes',
+        __DIR__ . '/Tests',
+    ])
+    ->withSkip([
+        __DIR__ . '/Tests/Acceptance/_output',
+    ])
+    ->withPhpSets(php82: true)
+    ->withSets([
+        LevelSetList::UP_TO_PHP_82,
+        SetList::CODE_QUALITY,
+        SetList::DEAD_CODE,
+        SetList::TYPE_DECLARATION,
+        Typo3SetList::TYPO3_13,
+    ]);
+```
+
+### Running Rector
+
+```bash
+# Dry run (show changes)
+vendor/bin/rector process --dry-run
+
+# Apply changes
+vendor/bin/rector process
+
+# Via runTests.sh
+Build/Scripts/runTests.sh -s rector
+```
+
+### Common Refactorings
+
+**TYPO3 API Modernization**:
+```php
+// Before
+$GLOBALS['TYPO3_DB']->exec_SELECTgetRows('*', 'pages', 'uid=1');
+
+// After (Rector auto-refactors)
+GeneralUtility::makeInstance(ConnectionPool::class)
+    ->getConnectionForTable('pages')
+    ->select(['*'], 'pages', ['uid' => 1])
+    ->fetchAllAssociative();
+```
+
+**Type Declarations**:
+```php
+// Before
+public function process($data)
+{
+    return $data;
+}
+
+// After
+public function process(array $data): array
+{
+    return $data;
+}
+```
+
+## php-cs-fixer
+
+### Installation
+
+```bash
+composer require --dev friendsofphp/php-cs-fixer
+```
+
+### Configuration
+
+Create `Build/php-cs-fixer.php`:
+
+```php
+<?php
+
+declare(strict_types=1);
+
+$finder = (new PhpCsFixer\Finder())
+    ->in(__DIR__ . '/../Classes')
+    ->in(__DIR__ . '/../Tests')
+    ->exclude('_output');
+
+return (new PhpCsFixer\Config())
+    ->setRules([
+        '@PSR12' => true,
+        '@PhpCsFixer' => true,
+        'array_syntax' => ['syntax' => 'short'],
+        'concat_space' => ['spacing' => 'one'],
+        'declare_strict_types' => true,
+        'ordered_imports' => ['sort_algorithm' => 'alpha'],
+        'no_unused_imports' => true,
+        'single_line_throw' => false,
+        'phpdoc_align' => false,
+        'phpdoc_no_empty_return' => false,
+        'phpdoc_summary' => false,
+    ])
+    ->setRiskyAllowed(true)
+    ->setFinder($finder);
+```
+
+### Running php-cs-fixer
+
+```bash
+# Check only (dry run)
+vendor/bin/php-cs-fixer fix --config Build/php-cs-fixer.php --dry-run --diff
+
+# Fix files
+vendor/bin/php-cs-fixer fix --config Build/php-cs-fixer.php
+
+# Via runTests.sh
+Build/Scripts/runTests.sh -s cgl
+```
+
+### Common Rules
+
+```php
+// array_syntax: short
+$array = [1, 2, 3]; // ✅
+$array = array(1, 2, 3); // ❌
+
+// concat_space: one
+$message = 'Hello ' . $name; // ✅
+$message = 'Hello '.$name; // ❌
+
+// declare_strict_types
+<?php
+
+declare(strict_types=1); // ✅ Required at top of file
+
+// ordered_imports
+use Vendor\Extension\Domain\Model\Product; // ✅ Alphabetical
+use Vendor\Extension\Domain\Repository\ProductRepository;
+```
+
+## phplint
+
+### Installation
+
+```bash
+composer require --dev overtrue/phplint
+```
+
+### Configuration
+
+Create `.phplint.yml`:
+
+```yaml
+path: ./
+jobs: 10
+cache: var/cache/phplint.cache
+exclude:
+    - vendor
+    - var
+    - .Build
+extensions:
+    - php
+```
+
+### Running phplint
+
+```bash
+# Lint all PHP files
+vendor/bin/phplint
+
+# Via runTests.sh
+Build/Scripts/runTests.sh -s lint
+
+# Specific directory
+vendor/bin/phplint Classes/
+```
+
+## Composer Script Integration
+
+```json
+{
+    "scripts": {
+        "ci:test:php:lint": "phplint",
+        "ci:test:php:phpstan": "phpstan analyze --configuration Build/phpstan.neon --no-progress",
+        "ci:test:php:rector": "rector process --dry-run",
+        "ci:test:php:cgl": "php-cs-fixer fix --config Build/php-cs-fixer.php --dry-run --diff",
+        "ci:test:php:security": "composer audit",
+
+        "fix:cgl": "php-cs-fixer fix --config Build/php-cs-fixer.php",
+        "fix:rector": "rector process",
+
+        "ci:test": [
+            "@ci:test:php:lint",
+            "@ci:test:php:phpstan",
+            "@ci:test:php:rector",
+            "@ci:test:php:cgl",
+            "@ci:test:php:security"
+        ]
+    }
+}
+```
+
+> **Security Note**: `composer audit` checks for known security vulnerabilities in dependencies. Run this regularly and especially before releases.
+
+## Pre-commit Hook
+
+Create `.git/hooks/pre-commit`:
+
+```bash
+#!/bin/sh
+
+echo "Running quality checks..."
+
+# Lint
+vendor/bin/phplint || exit 1
+
+# PHPStan
+vendor/bin/phpstan analyze --configuration Build/phpstan.neon --error-format=table --no-progress || exit 1
+
+# Code style
+vendor/bin/php-cs-fixer fix --config Build/php-cs-fixer.php --dry-run --diff || exit 1
+
+echo "✓ All checks passed"
+```
+
+## CI/CD Integration
+
+### GitHub Actions
+
+```yaml
+quality:
+  runs-on: ubuntu-latest
+  steps:
+    - uses: actions/checkout@v4
+    - uses: shivammathur/setup-php@v2
+      with:
+        php-version: '8.4'  # Use latest PHP for quality tools
+    - run: composer install
+    - run: composer ci:test:php:lint
+    - run: composer ci:test:php:phpstan
+    - run: composer ci:test:php:cgl
+    - run: composer ci:test:php:rector
+    - run: composer ci:test:php:security
+```
+
+## IDE Integration
+
+### PHPStorm
+
+1. **PHPStan**: Settings → PHP → Quality Tools → PHPStan
+2. **php-cs-fixer**: Settings → PHP → Quality Tools → PHP CS Fixer
+3. **File Watchers**: Auto-run on file save
+
+### VS Code
+
+```json
+{
+    "php.validate.executablePath": "/usr/bin/php",
+    "phpstan.enabled": true,
+    "phpstan.configFile": "Build/phpstan.neon",
+    "php-cs-fixer.onsave": true,
+    "php-cs-fixer.config": "Build/php-cs-fixer.php"
+}
+```
+
+## Best Practices
+
+1. **PHPStan Level 10**: Aim for `level: max` in modern TYPO3 13 projects
+2. **Baseline for Legacy**: Use baselines to track existing issues during migration
+3. **Security Audits**: Run `composer audit` regularly and in CI
+4. **Auto-fix in CI**: Run fixes automatically, fail on violations
+5. **Consistent Rules**: Share config across team
+6. **Pre-commit Checks**: Catch issues before commit (lint, PHPStan, CGL, security)
+7. **Latest PHP**: Run quality tools with latest PHP version (8.4+)
+8. **Regular Updates**: Keep tools and rules updated
+
+## Resources
+
+- [PHPStan Documentation](https://phpstan.org/user-guide/getting-started)
+- [Rector Documentation](https://getrector.com/documentation)
+- [PHP CS Fixer Documentation](https://github.com/PHP-CS-Fixer/PHP-CS-Fixer)
+- [TYPO3 Coding Guidelines](https://docs.typo3.org/m/typo3/reference-coreapi/main/en-us/CodingGuidelines/)
--- a/references/test-runners.md
+++ b/references/test-runners.md
@@ -0,0 +1,691 @@
+# Test Runners and Orchestration
+
+The `runTests.sh` script is the standard TYPO3 pattern for orchestrating all quality checks and test suites.
+
+## Purpose
+
+- Single entry point for all testing and quality checks
+- Consistent environment across local and CI/CD
+- Handles Docker, database setup, and test execution
+- Based on [TYPO3 Best Practices tea extension](https://github.com/TYPO3BestPractices/tea)
+
+## Script Location
+
+```
+Build/Scripts/runTests.sh
+```
+
+## Basic Usage
+
+```bash
+# Show help
+./Build/Scripts/runTests.sh -h
+
+# Run specific test suite
+./Build/Scripts/runTests.sh -s unit
+./Build/Scripts/runTests.sh -s functional
+./Build/Scripts/runTests.sh -s acceptance
+
+# Run quality tools
+./Build/Scripts/runTests.sh -s lint
+./Build/Scripts/runTests.sh -s phpstan
+./Build/Scripts/runTests.sh -s cgl
+./Build/Scripts/runTests.sh -s rector
+```
+
+## Script Options
+
+```
+-s <suite>     Test suite to run (required)
+               unit, functional, acceptance, lint, phpstan, cgl, rector
+
+-d <driver>    Database driver for functional tests
+               mysqli (default), pdo_mysql, postgres, sqlite
+
+-p <version>   PHP version (7.4, 8.1, 8.2, 8.3)
+
+-e <command>   Execute specific command in container
+
+-n             Don't pull Docker images
+
+-u             Update composer dependencies
+
+-v             Enable verbose output
+
+-x             Stop on first error (PHPUnit --stop-on-error)
+```
+
+## Examples
+
+### Run Unit Tests
+
+```bash
+# Default PHP version
+./Build/Scripts/runTests.sh -s unit
+
+# Specific PHP version
+./Build/Scripts/runTests.sh -s unit -p 8.3
+
+# Stop on first error
+./Build/Scripts/runTests.sh -s unit -x
+```
+
+### Run Functional Tests
+
+```bash
+# Default database (mysqli)
+./Build/Scripts/runTests.sh -s functional
+
+# PostgreSQL
+./Build/Scripts/runTests.sh -s functional -d postgres
+
+# SQLite (fastest for local development)
+./Build/Scripts/runTests.sh -s functional -d sqlite
+```
+
+### Run Quality Tools
+
+```bash
+# Lint all PHP files
+./Build/Scripts/runTests.sh -s lint
+
+# PHPStan static analysis
+./Build/Scripts/runTests.sh -s phpstan
+
+# Code style check
+./Build/Scripts/runTests.sh -s cgl
+
+# Rector automated refactoring
+./Build/Scripts/runTests.sh -s rector
+```
+
+### Custom Commands
+
+```bash
+# Run specific test file
+./Build/Scripts/runTests.sh -s unit -e "bin/phpunit Tests/Unit/Domain/Model/ProductTest.php"
+
+# Run with coverage
+./Build/Scripts/runTests.sh -s unit -e "bin/phpunit --coverage-html coverage/"
+```
+
+## Composer Integration
+
+Integrate runTests.sh into composer.json:
+
+```json
+{
+    "scripts": {
+        "ci:test": [
+            "@ci:test:php:lint",
+            "@ci:test:php:phpstan",
+            "@ci:test:php:cgl",
+            "@ci:test:php:rector",
+            "@ci:test:php:unit",
+            "@ci:test:php:functional"
+        ],
+        "ci:test:php:lint": "Build/Scripts/runTests.sh -s lint",
+        "ci:test:php:phpstan": "Build/Scripts/runTests.sh -s phpstan",
+        "ci:test:php:cgl": "Build/Scripts/runTests.sh -s cgl",
+        "ci:test:php:rector": "Build/Scripts/runTests.sh -s rector",
+        "ci:test:php:unit": "Build/Scripts/runTests.sh -s unit",
+        "ci:test:php:functional": "Build/Scripts/runTests.sh -s functional"
+    }
+}
+```
+
+Then run via composer:
+
+```bash
+composer ci:test              # All checks
+composer ci:test:php:unit     # Just unit tests
+composer ci:test:php:phpstan  # Just PHPStan
+```
+
+## Script Structure
+
+### Basic Template
+
+```bash
+#!/usr/bin/env bash
+
+# Script configuration
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_DIR="$(cd "${SCRIPT_DIR}/../.." && pwd)"
+
+# Default values
+TEST_SUITE=""
+DATABASE_DRIVER="mysqli"
+PHP_VERSION="8.4"
+VERBOSE=""
+
+# Parse arguments
+while getopts ":s:d:p:e:nuvx" opt; do
+    case ${opt} in
+        s) TEST_SUITE=${OPTARG} ;;
+        d) DATABASE_DRIVER=${OPTARG} ;;
+        p) PHP_VERSION=${OPTARG} ;;
+        *) showHelp; exit 1 ;;
+    esac
+done
+
+# Validate required arguments
+if [ -z "${TEST_SUITE}" ]; then
+    echo "Error: -s parameter (test suite) is required"
+    showHelp
+    exit 1
+fi
+
+# Execute test suite
+case ${TEST_SUITE} in
+    unit)
+        runUnitTests
+        ;;
+    functional)
+        runFunctionalTests
+        ;;
+    lint)
+        runLint
+        ;;
+    *)
+        echo "Error: Unknown test suite: ${TEST_SUITE}"
+        showHelp
+        exit 1
+        ;;
+esac
+```
+
+### Docker Integration
+
+```bash
+runUnitTests() {
+    CONTAINER_PATH="/app"
+
+    docker run \
+        --rm \
+        -v "${PROJECT_DIR}:${CONTAINER_PATH}" \
+        -w "${CONTAINER_PATH}" \
+        php:${PHP_VERSION}-cli \
+        bin/phpunit -c Build/phpunit/UnitTests.xml
+}
+
+runFunctionalTests() {
+    CONTAINER_PATH="/app"
+
+    docker run \
+        --rm \
+        -v "${PROJECT_DIR}:${CONTAINER_PATH}" \
+        -w "${CONTAINER_PATH}" \
+        -e typo3DatabaseDriver="${DATABASE_DRIVER}" \
+        -e typo3DatabaseHost="localhost" \
+        -e typo3DatabaseName="typo3_test" \
+        php:${PHP_VERSION}-cli \
+        bin/phpunit -c Build/phpunit/FunctionalTests.xml
+}
+```
+
+### Quality Tool Functions
+
+```bash
+runLint() {
+    docker run \
+        --rm \
+        -v "${PROJECT_DIR}:/app" \
+        -w /app \
+        php:${PHP_VERSION}-cli \
+        vendor/bin/phplint
+}
+
+runPhpstan() {
+    docker run \
+        --rm \
+        -v "${PROJECT_DIR}:/app" \
+        -w /app \
+        php:${PHP_VERSION}-cli \
+        vendor/bin/phpstan analyze --configuration Build/phpstan.neon
+}
+
+runCgl() {
+    docker run \
+        --rm \
+        -v "${PROJECT_DIR}:/app" \
+        -w /app \
+        php:${PHP_VERSION}-cli \
+        vendor/bin/php-cs-fixer fix --config Build/php-cs-fixer.php --dry-run --diff
+}
+```
+
+## Environment Variables
+
+Configure via environment variables:
+
+```bash
+# Database configuration
+export typo3DatabaseDriver=pdo_mysql
+export typo3DatabaseHost=db
+export typo3DatabasePort=3306
+export typo3DatabaseName=typo3_test
+export typo3DatabaseUsername=root
+export typo3DatabasePassword=root
+
+# TYPO3 context
+export TYPO3_CONTEXT=Testing
+
+# Run tests
+./Build/Scripts/runTests.sh -s functional
+```
+
+## CI/CD Integration
+
+### GitHub Actions
+
+```yaml
+name: Tests
+
+on: [push, pull_request]
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php: '8.2', '8.2', '8.3']
+        suite: ['unit', 'functional', 'lint', 'phpstan']
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Run ${{ matrix.suite }} tests
+        run: Build/Scripts/runTests.sh -s ${{ matrix.suite }} -p ${{ matrix.php }}
+```
+
+### GitLab CI
+
+```yaml
+.test:
+  image: php:${PHP_VERSION}-cli
+  script:
+    - Build/Scripts/runTests.sh -s ${TEST_SUITE} -p ${PHP_VERSION}
+
+unit:8.2:
+  extends: .test
+  variables:
+    PHP_VERSION: "8.2"
+    TEST_SUITE: "unit"
+
+functional:8.2:
+  extends: .test
+  variables:
+    PHP_VERSION: "8.2"
+    TEST_SUITE: "functional"
+```
+
+## Performance Optimization
+
+### Parallel Execution
+
+```bash
+# Run linting in parallel (fast)
+find . -name '*.php' -print0 | xargs -0 -n1 -P8 php -l
+
+# PHPUnit parallel execution
+vendor/bin/paratest -c Build/phpunit/UnitTests.xml --processes=4
+```
+
+### Caching
+
+```bash
+# Cache Composer dependencies
+if [ ! -d "${PROJECT_DIR}/.cache/composer" ]; then
+    mkdir -p "${PROJECT_DIR}/.cache/composer"
+fi
+
+docker run \
+    --rm \
+    -v "${PROJECT_DIR}:/app" \
+    -v "${PROJECT_DIR}/.cache/composer:/tmp/composer-cache" \
+    php:${PHP_VERSION}-cli \
+    composer install --no-progress --no-suggest
+```
+
+## Best Practices
+
+1. **Single Source of Truth**: Use runTests.sh for all test execution
+2. **CI/CD Alignment**: CI should use same script as local development
+3. **Docker Isolation**: Run tests in containers for consistency
+4. **Fast Feedback**: Run lint and unit tests first (fastest)
+5. **Matrix Testing**: Test multiple PHP versions and databases
+6. **Caching**: Cache dependencies to speed up execution
+7. **Verbose Mode**: Use `-v` flag for debugging test failures
+
+## Troubleshooting
+
+### Docker Permission Issues
+
+```bash
+# Run with current user
+docker run \
+    --rm \
+    --user $(id -u):$(id -g) \
+    -v "${PROJECT_DIR}:/app" \
+    php:${PHP_VERSION}-cli \
+    bin/phpunit
+```
+
+### Database Connection Errors
+
+```bash
+# Verify database is accessible
+docker run --rm --network host mysql:8.0 \
+    mysql -h localhost -u root -p -e "SELECT 1"
+
+# Use SQLite for simple tests
+./Build/Scripts/runTests.sh -s functional -d sqlite
+```
+
+### Missing Dependencies
+
+```bash
+# Update dependencies
+./Build/Scripts/runTests.sh -s unit -u
+```
+
+## Resources
+
+- [TYPO3 Tea Extension runTests.sh](https://github.com/TYPO3BestPractices/tea/blob/main/Build/Scripts/runTests.sh)
+- [TYPO3 Testing Documentation](https://docs.typo3.org/m/typo3/reference-coreapi/main/en-us/Testing/)
+- [PHPUnit Documentation](https://phpunit.de/documentation.html)
+
+## Multi-PHP Version Testing
+
+TYPO3 extensions should support multiple PHP versions to maximize compatibility. This section covers testing strategies for all supported PHP versions.
+
+### Standard Approach: Using Build/Scripts/runTests.sh
+
+The `runTests.sh` script with Docker containers is the recommended TYPO3 testing approach. It provides isolated environments and consistent results.
+
+#### Testing Across PHP Versions with Docker
+
+```bash
+# Test with PHP 8.2
+./Build/Scripts/runTests.sh -s unit -p 8.2
+./Build/Scripts/runTests.sh -s functional -p 8.2 -d sqlite
+
+# Test with PHP 8.3
+./Build/Scripts/runTests.sh -s unit -p 8.3
+./Build/Scripts/runTests.sh -s functional -p 8.3 -d sqlite
+
+# Test with PHP 8.4
+./Build/Scripts/runTests.sh -s unit -p 8.4
+./Build/Scripts/runTests.sh -s functional -p 8.4 -d sqlite
+```
+
+**Advantages:**
+- Isolated Docker containers per PHP version
+- Consistent environment across local and CI/CD
+- No need to install multiple PHP versions locally
+- Handles database setup automatically
+- Based on official TYPO3 best practices
+
+#### Complete Test Matrix Example
+
+```bash
+#!/bin/bash
+# Test all supported PHP versions and databases
+
+PHP_VERSIONS=("8.2" "8.3" "8.4")
+DATABASES=("sqlite" "mysql" "postgres")
+
+for PHP in "${PHP_VERSIONS[@]}"; do
+    echo "Testing PHP ${PHP}..."
+    
+    # Unit tests
+    ./Build/Scripts/runTests.sh -s unit -p "${PHP}"
+    
+    # Functional tests with different databases
+    for DB in "${DATABASES[@]}"; do
+        echo "  Functional tests with ${DB}..."
+        ./Build/Scripts/runTests.sh -s functional -p "${PHP}" -d "${DB}"
+    done
+    
+    # Quality tools (run once per PHP version)
+    ./Build/Scripts/runTests.sh -s lint -p "${PHP}"
+    ./Build/Scripts/runTests.sh -s phpstan -p "${PHP}"
+done
+```
+
+### Alternative Approach: Native PHP Versions (Without Docker)
+
+For CI/CD environments or when Docker is unavailable, use locally installed PHP versions.
+
+#### Testing with Native PHP Installations
+
+```bash
+# Test with PHP 8.2
+php8.2 /usr/local/bin/composer update --no-interaction
+php8.2 .Build/bin/phpunit --configuration=Build/phpunit/UnitTests.xml
+typo3DatabaseDriver=pdo_sqlite php8.2 .Build/bin/phpunit --configuration=Build/phpunit/FunctionalTests.xml
+
+# Test with PHP 8.3
+php8.3 /usr/local/bin/composer update --no-interaction
+php8.3 .Build/bin/phpunit --configuration=Build/phpunit/UnitTests.xml
+typo3DatabaseDriver=pdo_sqlite php8.3 .Build/bin/phpunit --configuration=Build/phpunit/FunctionalTests.xml
+
+# Test with PHP 8.4
+php8.4 /usr/local/bin/composer update --no-interaction
+php8.4 .Build/bin/phpunit --configuration=Build/phpunit/UnitTests.xml
+typo3DatabaseDriver=pdo_sqlite php8.4 .Build/bin/phpunit --configuration=Build/phpunit/FunctionalTests.xml
+```
+
+**CRITICAL**: Always run `composer update` with the target PHP version FIRST. This ensures:
+- Correct PHPUnit version selection (PHPUnit 11 for PHP 8.2, PHPUnit 12 for PHP 8.3+)
+- Proper dependency resolution for the PHP version
+- Compatible autoloader generation
+
+### PHPUnit Version Compatibility
+
+The `typo3/testing-framework` supports both PHPUnit 11 and 12, allowing Composer to automatically select the compatible version:
+
+| PHP Version | PHPUnit Version | Auto-Selected by Composer |
+|-------------|-----------------|---------------------------|
+| 8.2         | 11.x            | ✅ Yes                     |
+| 8.3         | 11.x or 12.x    | ✅ Yes (12.x preferred)    |
+| 8.4         | 11.x or 12.x    | ✅ Yes (12.x preferred)    |
+
+**Example: Automatic PHPUnit Selection**
+
+```bash
+# PHP 8.2 automatically gets PHPUnit 11
+$ php8.2 /usr/local/bin/composer update
+# Installing typo3/testing-framework (v8.0.14)
+# Installing phpunit/phpunit (11.5.42)
+
+# PHP 8.3 automatically gets PHPUnit 12
+$ php8.3 /usr/local/bin/composer update
+# Installing typo3/testing-framework (v8.0.14)
+# Installing phpunit/phpunit (12.4.1)
+```
+
+### GitHub Actions CI/CD Integration
+
+#### Using runTests.sh (Recommended)
+
+```yaml
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php: ['8.2', '8.3', '8.4']
+        suite: ['unit', 'functional']
+        database: ['sqlite', 'mysql', 'postgres']
+        exclude:
+          # Only test sqlite for unit tests
+          - suite: unit
+            database: mysql
+          - suite: unit
+            database: postgres
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Run ${{ matrix.suite }} tests on PHP ${{ matrix.php }}
+        run: |
+          Build/Scripts/runTests.sh \
+            -s ${{ matrix.suite }} \
+            -p ${{ matrix.php }} \
+            -d ${{ matrix.database }}
+```
+
+#### Using Native PHP (Alternative)
+
+```yaml
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php: ['8.2', '8.3', '8.4']
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up PHP ${{ matrix.php }}
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          extensions: dom, libxml, sqlite3
+          coverage: none
+
+      - name: Install dependencies
+        run: composer update --no-interaction --no-progress
+
+      - name: Run unit tests
+        run: .Build/bin/phpunit -c Build/phpunit/UnitTests.xml
+
+      - name: Run functional tests
+        env:
+          typo3DatabaseDriver: pdo_sqlite
+        run: .Build/bin/phpunit -c Build/phpunit/FunctionalTests.xml
+```
+
+### Common Pitfalls
+
+#### ❌ Wrong: Testing Without Updating Dependencies
+
+```bash
+# This will use wrong PHPUnit version
+php8.2 .Build/bin/phpunit -c Build/phpunit/UnitTests.xml
+```
+
+**Problem:** Uses PHPUnit version from previous `composer update`, may be incompatible.
+
+#### ✅ Right: Update Dependencies First
+
+```bash
+# This ensures correct PHPUnit version
+php8.2 /usr/local/bin/composer update --no-interaction
+php8.2 .Build/bin/phpunit -c Build/phpunit/UnitTests.xml
+```
+
+#### ❌ Wrong: Removing PHP Version Support Due to Test Failures
+
+```bash
+# Don't do this!
+# composer.json: "php": "^8.3 || ^8.4"  # Removed 8.2
+```
+
+**Problem:** Unnecessarily reduces compatibility. Fix the testing approach instead.
+
+#### ✅ Right: Fix Testing Process
+
+```bash
+# Run composer update with the problematic PHP version
+php8.2 /usr/local/bin/composer update
+# Composer automatically selects compatible dependencies
+# Now tests work correctly
+```
+
+### Best Practices
+
+1. **Standard Approach First**: Use `Build/Scripts/runTests.sh` with Docker whenever possible
+2. **Update Before Testing**: Always run `composer update` with target PHP version first (native approach)
+3. **Trust Composer**: Let Composer select compatible PHPUnit versions automatically
+4. **Test All Versions**: Run full test suite on all supported PHP versions in CI
+5. **SQLite for Speed**: Use SQLite for local functional testing (fastest)
+6. **Matrix Testing**: Use CI matrix to test all PHP versions in parallel
+7. **Don't Remove Support**: Fix testing process, don't remove PHP version support
+
+### Troubleshooting
+
+#### Docker Issues
+
+```bash
+# Update Docker images
+./Build/Scripts/runTests.sh -u
+
+# Check Docker is running
+docker ps
+
+# Clean up old containers
+docker system prune -a
+```
+
+#### Native PHP Issues
+
+```bash
+# Verify PHP version
+php8.2 --version
+
+# Check installed extensions
+php8.2 -m | grep -E 'dom|libxml|sqlite'
+
+# Clean and reinstall dependencies
+rm -rf .Build vendor composer.lock
+php8.2 /usr/local/bin/composer install
+```
+
+#### PHPUnit Version Conflicts
+
+```bash
+# Clear Composer cache
+php8.2 /usr/local/bin/composer clear-cache
+
+# Show why PHPUnit version was selected
+php8.2 /usr/local/bin/composer why phpunit/phpunit
+
+# Force dependency resolution
+rm composer.lock
+php8.2 /usr/local/bin/composer update --with-all-dependencies
+```
+
+### Summary
+
+| Aspect | Docker/runTests.sh | Native PHP |
+|--------|-------------------|------------|
+| **Use Case** | Standard TYPO3 development | CI/CD, no Docker available |
+| **Isolation** | ✅ Full container isolation | ⚠️ System-wide PHP |
+| **Setup** | Docker required | Multiple PHP versions required |
+| **Speed** | Slower (container overhead) | Faster (native execution) |
+| **Consistency** | ✅ Guaranteed environment | ⚠️ Depends on system config |
+| **Recommendation** | **Recommended** | Alternative when needed |
+
+**Choose Docker/runTests.sh for:**
+- Local development and testing
+- Consistent environment across team
+- Official TYPO3 best practices
+
+**Choose Native PHP for:**
+- GitHub Actions/GitLab CI environments
+- Systems without Docker
+- Performance-critical testing pipelines
--- a/references/unit-testing.md
+++ b/references/unit-testing.md
@@ -0,0 +1,929 @@
+# Unit Testing in TYPO3
+
+Unit tests are fast, isolated tests that verify individual components without external dependencies like databases or file systems.
+
+## When to Use Unit Tests
+
+✅ **Ideal for:**
+- Testing pure business logic
+- Validators, calculators, transformers
+- Value objects and DTOs
+- Utilities and helper functions
+- Domain models without persistence
+- **Controllers with dependency injection** (new in TYPO3 13)
+- **Services with injected dependencies**
+
+❌ **Not suitable for:**
+- Database operations (use functional tests)
+- File system operations
+- Methods using `BackendUtility` or global state
+- Complex TYPO3 framework integration
+- Parent class behavior from framework classes
+
+## Base Class
+
+All unit tests extend `TYPO3\TestingFramework\Core\Unit\UnitTestCase`:
+
+```php
+<?php
+
+declare(strict_types=1);
+
+namespace Vendor\Extension\Tests\Unit\Domain\Validator;
+
+use PHPUnit\Framework\Attributes\Test;
+use TYPO3\TestingFramework\Core\Unit\UnitTestCase;
+use Vendor\Extension\Domain\Validator\EmailValidator;
+
+/**
+ * Unit tests for EmailValidator.
+ *
+ * @covers \Vendor\Extension\Domain\Validator\EmailValidator
+ */
+final class EmailValidatorTest extends UnitTestCase
+{
+    private EmailValidator $subject;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+        $this->subject = new EmailValidator();
+    }
+
+    #[Test]
+    public function validEmailPassesValidation(): void
+    {
+        $result = $this->subject->validate('user@example.com');
+
+        self::assertFalse($result->hasErrors());
+    }
+
+    #[Test]
+    public function invalidEmailFailsValidation(): void
+    {
+        $result = $this->subject->validate('invalid-email');
+
+        self::assertTrue($result->hasErrors());
+    }
+}
+```
+
+> **Note:** TYPO3 13+ with PHPUnit 11/12 uses PHP attributes (`#[Test]`) instead of `@test` annotations.
+> Use `private` instead of `protected` for properties when possible (better encapsulation).
+
+## Key Principles
+
+### 1. No External Dependencies
+
+Unit tests should NOT:
+- Access the database
+- Read/write files
+- Make HTTP requests
+- Use TYPO3 framework services
+
+### 2. Fast Execution
+
+Unit tests should run in milliseconds:
+- No I/O operations
+- Minimal object instantiation
+- Use mocks for dependencies
+
+### 3. Test Independence
+
+Each test should:
+- Be runnable standalone
+- Not depend on execution order
+- Clean up in tearDown()
+
+## Test Structure
+
+### Arrange-Act-Assert Pattern
+
+```php
+/**
+ * @test
+ */
+public function calculatesTotalPrice(): void
+{
+    // Arrange: Set up test data
+    $cart = new ShoppingCart();
+    $cart->addItem(new Item('product1', 10.00, 2));
+    $cart->addItem(new Item('product2', 5.50, 1));
+
+    // Act: Execute the code under test
+    $total = $cart->calculateTotal();
+
+    // Assert: Verify the result
+    self::assertSame(25.50, $total);
+}
+```
+
+### setUp() and tearDown()
+
+```php
+protected function setUp(): void
+{
+    parent::setUp();
+    // Initialize test subject and dependencies
+    $this->subject = new Calculator();
+}
+
+protected function tearDown(): void
+{
+    // Clean up resources
+    unset($this->subject);
+    parent::tearDown();
+}
+```
+
+## Testing with Dependency Injection (TYPO3 13+)
+
+Modern TYPO3 13 controllers and services use constructor injection. Here's how to test them:
+
+### Basic Constructor Injection Test
+
+```php
+<?php
+
+declare(strict_types=1);
+
+namespace Vendor\Extension\Tests\Unit\Controller;
+
+use PHPUnit\Framework\Attributes\Test;
+use PHPUnit\Framework\MockObject\MockObject;
+use TYPO3\CMS\Core\Resource\ResourceFactory;
+use TYPO3\TestingFramework\Core\Unit\UnitTestCase;
+use Vendor\Extension\Controller\ImageController;
+
+final class ImageControllerTest extends UnitTestCase
+{
+    private ImageController $subject;
+
+    /** @var ResourceFactory&MockObject */
+    private ResourceFactory $resourceFactoryMock;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        /** @var ResourceFactory&MockObject $resourceFactoryMock */
+        $resourceFactoryMock = $this->createMock(ResourceFactory::class);
+
+        $this->resourceFactoryMock = $resourceFactoryMock;
+        $this->subject             = new ImageController($this->resourceFactoryMock);
+    }
+
+    #[Test]
+    public function getFileRetrievesFileFromFactory(): void
+    {
+        $fileId = 123;
+        $fileMock = $this->createMock(\TYPO3\CMS\Core\Resource\File::class);
+
+        $this->resourceFactoryMock
+            ->expects(self::once())
+            ->method('getFileObject')
+            ->with($fileId)
+            ->willReturn($fileMock);
+
+        $result = $this->subject->getFile($fileId);
+
+        self::assertSame($fileMock, $result);
+    }
+}
+```
+
+### Multiple Dependencies with Intersection Types
+
+PHPUnit mocks require proper type hints using intersection types for PHPStan compliance:
+
+```php
+<?php
+
+declare(strict_types=1);
+
+namespace Vendor\Extension\Tests\Unit\Controller;
+
+use PHPUnit\Framework\Attributes\Test;
+use PHPUnit\Framework\MockObject\MockObject;
+use TYPO3\CMS\Core\Log\LogManager;
+use TYPO3\CMS\Core\Resource\ResourceFactory;
+use TYPO3\TestingFramework\Core\Unit\UnitTestCase;
+use Vendor\Extension\Controller\ImageController;
+use Vendor\Extension\Utils\ImageProcessor;
+
+final class ImageControllerTest extends UnitTestCase
+{
+    private ImageController $subject;
+
+    /** @var ResourceFactory&MockObject */
+    private ResourceFactory $resourceFactoryMock;
+
+    /** @var ImageProcessor&MockObject */
+    private ImageProcessor $imageProcessorMock;
+
+    /** @var LogManager&MockObject */
+    private LogManager $logManagerMock;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        /** @var ResourceFactory&MockObject $resourceFactoryMock */
+        $resourceFactoryMock = $this->createMock(ResourceFactory::class);
+
+        /** @var ImageProcessor&MockObject $imageProcessorMock */
+        $imageProcessorMock = $this->createMock(ImageProcessor::class);
+
+        /** @var LogManager&MockObject $logManagerMock */
+        $logManagerMock = $this->createMock(LogManager::class);
+
+        $this->resourceFactoryMock = $resourceFactoryMock;
+        $this->imageProcessorMock  = $imageProcessorMock;
+        $this->logManagerMock      = $logManagerMock;
+
+        $this->subject = new ImageController(
+            $this->resourceFactoryMock,
+            $this->imageProcessorMock,
+            $this->logManagerMock,
+        );
+    }
+
+    #[Test]
+    public function processImageUsesInjectedProcessor(): void
+    {
+        $fileMock = $this->createMock(\TYPO3\CMS\Core\Resource\File::class);
+        $processedFileMock = $this->createMock(\TYPO3\CMS\Core\Resource\ProcessedFile::class);
+
+        $this->imageProcessorMock
+            ->expects(self::once())
+            ->method('process')
+            ->with($fileMock, ['width' => 800])
+            ->willReturn($processedFileMock);
+
+        $result = $this->subject->processImage($fileMock, ['width' => 800]);
+
+        self::assertSame($processedFileMock, $result);
+    }
+}
+```
+
+**Key Points:**
+- Use intersection types: `ResourceFactory&MockObject` for proper PHPStan type checking
+- Assign mocks to properly typed variables before passing to constructor
+- This pattern works with PHPUnit 11/12 and PHPStan Level 10
+
+### Handling $GLOBALS and Singleton State
+
+Some TYPO3 components still use global state. Handle this properly:
+
+```php
+final class BackendControllerTest extends UnitTestCase
+{
+    protected bool $resetSingletonInstances = true;
+
+    #[Test]
+    public function checksBackendUserPermissions(): void
+    {
+        // Mock backend user
+        $backendUserMock = $this->createMock(BackendUserAuthentication::class);
+        $backendUserMock->method('isAdmin')->willReturn(true);
+
+        $GLOBALS['BE_USER'] = $backendUserMock;
+
+        $result = $this->subject->hasAccess();
+
+        self::assertTrue($result);
+    }
+
+    #[Test]
+    public function returnsFalseWhenNoBackendUser(): void
+    {
+        $GLOBALS['BE_USER'] = null;
+
+        $result = $this->subject->hasAccess();
+
+        self::assertFalse($result);
+    }
+}
+```
+
+**Important:** Set `protected bool $resetSingletonInstances = true;` when tests interact with TYPO3 singletons to prevent test pollution.
+
+## Mocking Dependencies
+
+Use PHPUnit's built-in mocking (PHPUnit 11/12):
+
+```php
+<?php
+
+declare(strict_types=1);
+
+namespace Vendor\Extension\Tests\Unit\Service;
+
+use PHPUnit\Framework\Attributes\Test;
+use PHPUnit\Framework\MockObject\MockObject;
+use TYPO3\TestingFramework\Core\Unit\UnitTestCase;
+use Vendor\Extension\Domain\Model\User;
+use Vendor\Extension\Domain\Repository\UserRepository;
+use Vendor\Extension\Service\UserService;
+
+final class UserServiceTest extends UnitTestCase
+{
+    private UserService $subject;
+
+    /** @var UserRepository&MockObject */
+    private UserRepository $repositoryMock;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        /** @var UserRepository&MockObject $repositoryMock */
+        $repositoryMock = $this->createMock(UserRepository::class);
+
+        $this->repositoryMock = $repositoryMock;
+        $this->subject        = new UserService($this->repositoryMock);
+    }
+
+    #[Test]
+    public function findsUserByEmail(): void
+    {
+        $email = 'test@example.com';
+        $user  = new User('John');
+
+        $this->repositoryMock
+            ->expects(self::once())
+            ->method('findByEmail')
+            ->with($email)
+            ->willReturn($user);
+
+        $result = $this->subject->getUserByEmail($email);
+
+        self::assertSame('John', $result->getName());
+    }
+
+    #[Test]
+    public function throwsExceptionWhenUserNotFound(): void
+    {
+        $email = 'nonexistent@example.com';
+
+        $this->repositoryMock
+            ->method('findByEmail')
+            ->with($email)
+            ->willReturn(null);
+
+        $this->expectException(\RuntimeException::class);
+        $this->expectExceptionMessage('User not found');
+
+        $this->subject->getUserByEmail($email);
+    }
+}
+```
+
+> **Note:** TYPO3 13+ with PHPUnit 11/12 uses `createMock()` instead of Prophecy.
+> Prophecy is deprecated and should not be used in new tests.
+
+## Assertions
+
+### Common Assertions
+
+```php
+// Equality
+self::assertEquals($expected, $actual);
+self::assertSame($expected, $actual); // Strict comparison
+
+// Boolean
+self::assertTrue($condition);
+self::assertFalse($condition);
+
+// Null checks
+self::assertNull($value);
+self::assertNotNull($value);
+
+// Type checks
+self::assertIsString($value);
+self::assertIsInt($value);
+self::assertIsArray($value);
+self::assertInstanceOf(User::class, $object);
+
+// Collections
+self::assertCount(3, $array);
+self::assertEmpty($array);
+self::assertContains('item', $array);
+
+// Exceptions
+$this->expectException(\InvalidArgumentException::class);
+$this->expectExceptionMessage('Invalid input');
+$subject->methodThatThrows();
+```
+
+### Specific Over Generic
+
+```php
+// ❌ Too generic
+self::assertTrue($result > 0);
+self::assertEquals(true, $isValid);
+
+// ✅ Specific and clear
+self::assertGreaterThan(0, $result);
+self::assertTrue($isValid);
+```
+
+## Data Providers
+
+Test multiple scenarios with data providers:
+
+```php
+/**
+ * @test
+ * @dataProvider validEmailProvider
+ */
+public function validatesEmails(string $email, bool $expected): void
+{
+    $result = $this->subject->isValid($email);
+    self::assertSame($expected, $result);
+}
+
+public static function validEmailProvider(): array
+{
+    return [
+        'valid email' => ['user@example.com', true],
+        'email with subdomain' => ['user@mail.example.com', true],
+        'missing @' => ['userexample.com', false],
+        'missing domain' => ['user@', false],
+        'empty string' => ['', false],
+    ];
+}
+```
+
+## Testing Private/Protected Methods
+
+**Preferred Approach**: Test through public API whenever possible:
+
+```php
+// ✅ Best approach - test through public interface
+$result = $subject->publicMethodThatUsesPrivateMethod();
+self::assertSame($expected, $result);
+```
+
+**When Reflection is Acceptable**: Sometimes protected methods contain complex logic that deserves dedicated testing (e.g., URL validation, attribute resolution). In these cases, use a helper method:
+
+```php
+<?php
+
+declare(strict_types=1);
+
+namespace Vendor\Extension\Tests\Unit\Controller;
+
+use PHPUnit\Framework\Attributes\Test;
+use ReflectionMethod;
+use TYPO3\TestingFramework\Core\Unit\UnitTestCase;
+use Vendor\Extension\Controller\ImageController;
+
+final class ImageControllerTest extends UnitTestCase
+{
+    private ImageController $subject;
+
+    /**
+     * Helper method to access protected methods.
+     *
+     * @param array<int, mixed> $args
+     */
+    private function callProtectedMethod(string $methodName, array $args): mixed
+    {
+        $reflection = new ReflectionMethod($this->subject, $methodName);
+        $reflection->setAccessible(true);
+
+        return $reflection->invokeArgs($this->subject, $args);
+    }
+
+    #[Test]
+    public function isExternalImageReturnsTrueForHttpsUrls(): void
+    {
+        $result = $this->callProtectedMethod('isExternalImage', ['https://example.com/image.jpg']);
+
+        self::assertTrue($result);
+    }
+
+    #[Test]
+    public function isExternalImageReturnsFalseForLocalPaths(): void
+    {
+        $result = $this->callProtectedMethod('isExternalImage', ['/fileadmin/images/test.jpg']);
+
+        self::assertFalse($result);
+    }
+}
+```
+
+**Important Considerations**:
+- Only use reflection when testing protected methods with complex logic worth testing independently
+- Never test private methods - refactor to protected if testing is needed
+- Prefer testing through public API when the logic is simple
+- Document why reflection testing is used for a specific method
+
+## Configuration
+
+### PHPUnit XML (Build/phpunit/UnitTests.xml)
+
+```xml
+<phpunit
+    bootstrap="../../vendor/autoload.php"
+    cacheResult="false"
+    beStrictAboutTestsThatDoNotTestAnything="true"
+    beStrictAboutOutputDuringTests="true"
+    failOnDeprecation="true"
+    failOnNotice="true"
+    failOnWarning="true"
+    failOnRisky="true">
+    <testsuites>
+        <testsuite name="Unit tests">
+            <directory>../../Tests/Unit/</directory>
+        </testsuite>
+    </testsuites>
+</phpunit>
+```
+
+## Best Practices
+
+1. **One Assert Per Test**: Focus tests on single behavior
+2. **Clear Test Names**: Describe what is tested and expected result
+3. **Arrange-Act-Assert**: Follow consistent structure
+4. **No Logic in Tests**: Tests should be simple and readable
+5. **Test Edge Cases**: Empty strings, null, zero, negative numbers
+6. **Use Data Providers**: Test multiple scenarios efficiently
+7. **Mock External Dependencies**: Keep tests isolated and fast
+
+## Common Pitfalls
+
+❌ **Testing Framework Code**
+```php
+// Don't test TYPO3 core functionality
+$this->assertTrue(is_array([])); // Useless test
+```
+
+❌ **Slow Tests**
+```php
+// Don't access file system in unit tests
+file_put_contents('/tmp/test.txt', 'data');
+```
+
+❌ **Test Interdependence**
+```php
+// Don't depend on test execution order
+/** @depends testCreate */
+public function testUpdate(): void { }
+```
+
+✅ **Focused, Fast, Isolated Tests**
+```php
+/**
+ * @test
+ */
+public function calculatesPriceWithDiscount(): void
+{
+    $calculator = new PriceCalculator();
+    $price = $calculator->calculate(100.0, 0.2);
+    self::assertSame(80.0, $price);
+}
+```
+
+## Running Unit Tests
+
+```bash
+# Via runTests.sh
+Build/Scripts/runTests.sh -s unit
+
+# Via PHPUnit directly
+vendor/bin/phpunit -c Build/phpunit/UnitTests.xml
+
+# Via Composer
+composer ci:test:php:unit
+
+# Single test file
+vendor/bin/phpunit Tests/Unit/Domain/Validator/EmailValidatorTest.php
+
+# Single test method
+vendor/bin/phpunit --filter testValidEmail
+```
+
+## Troubleshooting Common Issues
+
+### PHPStan Errors with Mocks
+
+**Problem**: PHPStan complains about mock type mismatches.
+```
+Method expects ResourceFactory but got ResourceFactory&MockObject
+```
+
+**Solution**: Use intersection type annotations:
+```php
+/** @var ResourceFactory&MockObject */
+private ResourceFactory $resourceFactoryMock;
+
+protected function setUp(): void
+{
+    parent::setUp();
+
+    /** @var ResourceFactory&MockObject $resourceFactoryMock */
+    $resourceFactoryMock = $this->createMock(ResourceFactory::class);
+
+    $this->resourceFactoryMock = $resourceFactoryMock;
+    $this->subject = new MyController($this->resourceFactoryMock);
+}
+```
+
+### Undefined Array Key Warnings
+
+**Problem**: Tests throw warnings about missing array keys.
+```
+Undefined array key "fileId"
+```
+
+**Solution**: Always provide all required keys in mock arrays:
+```php
+// ❌ Incomplete mock data
+$requestMock->method('getQueryParams')->willReturn([
+    'fileId' => 123,
+]);
+
+// ✅ Complete mock data
+$requestMock->method('getQueryParams')->willReturn([
+    'fileId' => 123,
+    'table'  => 'tt_content',
+    'P'      => [],
+]);
+```
+
+### Tests Requiring Functional Setup
+
+**Problem**: Unit tests fail with cache or framework errors.
+```
+NoSuchCacheException: A cache with identifier "runtime" does not exist.
+```
+
+**Solution**: Identify methods that require TYPO3 framework infrastructure and move them to functional tests:
+- Methods using `BackendUtility::getPagesTSconfig()`
+- Methods calling parent class framework behavior
+- Methods requiring global state like `$GLOBALS['TYPO3_CONF_VARS']`
+
+Add comments explaining the limitation:
+```php
+// Note: getMaxDimensions tests require functional test setup due to BackendUtility dependency
+// These are better tested in functional tests
+```
+
+### Singleton State Pollution
+
+**Problem**: Tests interfere with each other due to singleton state.
+
+**Solution**: Enable singleton reset in your test class:
+```php
+final class MyControllerTest extends UnitTestCase
+{
+    protected bool $resetSingletonInstances = true;
+
+    #[Test]
+    public function testWithGlobals(): void
+    {
+        $GLOBALS['BE_USER'] = $this->createMock(BackendUserAuthentication::class);
+        // Test will clean up automatically
+    }
+}
+```
+
+### Exception Flow Issues
+
+**Problem**: Catching and re-throwing exceptions masks the original error.
+```php
+// ❌ Inner exception caught by outer catch
+try {
+    $file = $this->factory->getFile($id);
+    if ($file->isDeleted()) {
+        throw new RuntimeException('Deleted', 1234);
+    }
+} catch (Exception $e) {
+    throw new RuntimeException('Not found', 5678);
+}
+```
+
+**Solution**: Separate concerns - catch only what you need:
+```php
+// ✅ Proper exception flow
+try {
+    $file = $this->factory->getFile($id);
+} catch (Exception $e) {
+    throw new RuntimeException('Not found', 5678, $e);
+}
+
+if ($file->isDeleted()) {
+    throw new RuntimeException('Deleted', 1234);
+}
+```
+
+## Testing DataHandler Hooks
+
+DataHandler hooks (`processDatamap_*`, `processCmdmap_*`) require careful testing as they interact with TYPO3 globals.
+
+### Example: Testing processDatamap_postProcessFieldArray
+
+```php
+<?php
+
+declare(strict_types=1);
+
+namespace Vendor\Extension\Tests\Unit\Database;
+
+use PHPUnit\Framework\Attributes\Test;
+use PHPUnit\Framework\MockObject\MockObject;
+use TYPO3\CMS\Core\Configuration\ExtensionConfiguration;
+use TYPO3\CMS\Core\Context\Context;
+use TYPO3\CMS\Core\DataHandling\DataHandler;
+use TYPO3\CMS\Core\Http\RequestFactory;
+use TYPO3\CMS\Core\Log\LogManager;
+use TYPO3\CMS\Core\Log\Logger;
+use TYPO3\CMS\Core\Resource\DefaultUploadFolderResolver;
+use TYPO3\CMS\Core\Resource\ResourceFactory;
+use TYPO3\TestingFramework\Core\Unit\UnitTestCase;
+use Vendor\Extension\Database\MyDataHandlerHook;
+
+/**
+ * Unit tests for MyDataHandlerHook.
+ *
+ * @covers \Vendor\Extension\Database\MyDataHandlerHook
+ */
+final class MyDataHandlerHookTest extends UnitTestCase
+{
+    protected bool $resetSingletonInstances = true;
+
+    private MyDataHandlerHook $subject;
+
+    /** @var ExtensionConfiguration&MockObject */
+    private ExtensionConfiguration $extensionConfigurationMock;
+
+    /** @var LogManager&MockObject */
+    private LogManager $logManagerMock;
+
+    /** @var ResourceFactory&MockObject */
+    private ResourceFactory $resourceFactoryMock;
+
+    /** @var Context&MockObject */
+    private Context $contextMock;
+
+    /** @var RequestFactory&MockObject */
+    private RequestFactory $requestFactoryMock;
+
+    /** @var DefaultUploadFolderResolver&MockObject */
+    private DefaultUploadFolderResolver $uploadFolderResolverMock;
+
+    /** @var Logger&MockObject */
+    private Logger $loggerMock;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        // Create all required mocks with intersection types for PHPStan compliance
+        /** @var ExtensionConfiguration&MockObject $extensionConfigurationMock */
+        $extensionConfigurationMock = $this->createMock(ExtensionConfiguration::class);
+
+        /** @var LogManager&MockObject $logManagerMock */
+        $logManagerMock = $this->createMock(LogManager::class);
+
+        /** @var ResourceFactory&MockObject $resourceFactoryMock */
+        $resourceFactoryMock = $this->createMock(ResourceFactory::class);
+
+        /** @var Context&MockObject $contextMock */
+        $contextMock = $this->createMock(Context::class);
+
+        /** @var RequestFactory&MockObject $requestFactoryMock */
+        $requestFactoryMock = $this->createMock(RequestFactory::class);
+
+        /** @var DefaultUploadFolderResolver&MockObject $uploadFolderResolverMock */
+        $uploadFolderResolverMock = $this->createMock(DefaultUploadFolderResolver::class);
+
+        /** @var Logger&MockObject $loggerMock */
+        $loggerMock = $this->createMock(Logger::class);
+
+        // Configure extension configuration mock with willReturnCallback
+        $extensionConfigurationMock
+            ->method('get')
+            ->willReturnCallback(function ($extension, $key) {
+                if ($extension === 'my_extension') {
+                    return match ($key) {
+                        'enableFeature' => true,
+                        'timeout'       => 30,
+                        default         => null,
+                    };
+                }
+
+                return null;
+            });
+
+        // Configure log manager to return logger mock
+        $logManagerMock
+            ->method('getLogger')
+            ->with(MyDataHandlerHook::class)
+            ->willReturn($loggerMock);
+
+        // Assign mocks to properties
+        $this->extensionConfigurationMock = $extensionConfigurationMock;
+        $this->logManagerMock             = $logManagerMock;
+        $this->resourceFactoryMock        = $resourceFactoryMock;
+        $this->contextMock                = $contextMock;
+        $this->requestFactoryMock         = $requestFactoryMock;
+        $this->uploadFolderResolverMock   = $uploadFolderResolverMock;
+        $this->loggerMock                 = $loggerMock;
+
+        // Create subject with all dependencies
+        $this->subject = new MyDataHandlerHook(
+            $this->extensionConfigurationMock,
+            $this->logManagerMock,
+            $this->resourceFactoryMock,
+            $this->contextMock,
+            $this->requestFactoryMock,
+            $this->uploadFolderResolverMock,
+        );
+    }
+
+    #[Test]
+    public function constructorInitializesWithDependencyInjection(): void
+    {
+        // Verify subject was created successfully with all dependencies
+        self::assertInstanceOf(MyDataHandlerHook::class, $this->subject);
+    }
+
+    #[Test]
+    public function processDatamapPostProcessFieldArrayHandlesFieldCorrectly(): void
+    {
+        $status     = 'update';
+        $table      = 'tt_content';
+        $id         = '123';
+        $fieldArray = ['bodytext' => '<p>Content with processing</p>'];
+
+        /** @var DataHandler&MockObject $dataHandlerMock */
+        $dataHandlerMock = $this->createMock(DataHandler::class);
+
+        // Mock TCA configuration for RTE field
+        $GLOBALS['TCA']['tt_content']['columns']['bodytext']['config'] = [
+            'type'        => 'text',
+            'enableRichtext' => true,
+        ];
+
+        // Test the hook processes the field
+        $this->subject->processDatamap_postProcessFieldArray(
+            $status,
+            $table,
+            $id,
+            $fieldArray,
+            $dataHandlerMock,
+        );
+
+        // Assert field was processed (actual assertion depends on implementation)
+        self::assertNotEmpty($fieldArray['bodytext']);
+    }
+
+    #[Test]
+    public function constructorLoadsExtensionConfiguration(): void
+    {
+        /** @var ExtensionConfiguration&MockObject $configMock */
+        $configMock = $this->createMock(ExtensionConfiguration::class);
+        $configMock
+            ->expects(self::exactly(2))
+            ->method('get')
+            ->willReturnCallback(function ($extension, $key) {
+                self::assertSame('my_extension', $extension);
+
+                return match ($key) {
+                    'enableFeature' => true,
+                    'timeout'       => 30,
+                    default         => null,
+                };
+            });
+
+        new MyDataHandlerHook(
+            $configMock,
+            $this->logManagerMock,
+            $this->resourceFactoryMock,
+            $this->contextMock,
+            $this->requestFactoryMock,
+            $this->uploadFolderResolverMock,
+        );
+    }
+}
+```
+
+**Key Testing Patterns for DataHandler Hooks:**
+
+1. **Intersection Types for PHPStan**: Use `ResourceFactory&MockObject` for strict type compliance
+2. **TCA Globals**: Set `$GLOBALS['TCA']` in tests to simulate TYPO3 table configuration
+3. **Extension Configuration**: Use `willReturnCallback` with `match` expressions for flexible config mocking
+4. **DataHandler Mock**: Create mock for `$dataHandler` parameter (required in hook signature)
+5. **Reset Singletons**: Always set `protected bool $resetSingletonInstances = true;`
+6. **Constructor DI**: Inject all dependencies via constructor (TYPO3 13+ best practice)
+
+## Resources
+
+- [TYPO3 Unit Testing Documentation](https://docs.typo3.org/m/typo3/reference-coreapi/main/en-us/Testing/UnitTests.html)
+- [PHPUnit Documentation](https://phpunit.de/documentation.html)
+- [PHPUnit 11 Migration Guide](https://phpunit.de/announcements/phpunit-11.html)
+- [TYPO3 DataHandler Hooks](https://docs.typo3.org/m/typo3/reference-coreapi/main/en-us/ApiOverview/Hooks/DataHandler/Index.html)
--- a/scripts/generate-test.sh
+++ b/scripts/generate-test.sh
@@ -0,0 +1,224 @@
+#!/usr/bin/env bash
+
+#
+# Generate TYPO3 test class
+#
+# Usage: ./generate-test.sh <type> <ClassName>
+# Example: ./generate-test.sh unit EmailValidator
+#
+
+set -e
+
+# Colors
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m'
+
+# Parse arguments
+TEST_TYPE="$1"
+CLASS_NAME="$2"
+
+if [ -z "${TEST_TYPE}" ] || [ -z "${CLASS_NAME}" ]; then
+    echo "Usage: $0 <type> <ClassName>"
+    echo
+    echo "Types:"
+    echo "  unit         - Unit test (fast, no database)"
+    echo "  functional   - Functional test (with database)"
+    echo "  acceptance   - Acceptance test (browser-based)"
+    echo
+    echo "Example:"
+    echo "  $0 unit EmailValidator"
+    echo "  $0 functional ProductRepository"
+    echo "  $0 acceptance LoginCest"
+    exit 1
+fi
+
+# Validate test type
+case ${TEST_TYPE} in
+    unit|functional|acceptance)
+        ;;
+    *)
+        echo -e "${RED}Error: Invalid test type '${TEST_TYPE}'${NC}"
+        echo "Valid types: unit, functional, acceptance"
+        exit 1
+        ;;
+esac
+
+# Determine paths
+PROJECT_DIR="$(pwd)"
+SKILL_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+
+# Check if Tests directory exists
+if [ ! -d "${PROJECT_DIR}/Tests" ]; then
+    echo -e "${RED}Error: Tests directory not found${NC}"
+    echo "Run setup-testing.sh first"
+    exit 1
+fi
+
+# Set target directory based on test type
+case ${TEST_TYPE} in
+    unit)
+        TEST_DIR="${PROJECT_DIR}/Tests/Unit"
+        TEST_SUFFIX="Test"
+        ;;
+    functional)
+        TEST_DIR="${PROJECT_DIR}/Tests/Functional"
+        TEST_SUFFIX="Test"
+        ;;
+    acceptance)
+        TEST_DIR="${PROJECT_DIR}/Tests/Acceptance"
+        TEST_SUFFIX="Cest"
+        ;;
+esac
+
+# Extract namespace from composer.json
+NAMESPACE=$(php -r '
+    $composer = json_decode(file_get_contents("composer.json"), true);
+    foreach ($composer["autoload"]["psr-4"] ?? [] as $ns => $path) {
+        if (strpos($path, "Classes") !== false) {
+            echo rtrim($ns, "\\");
+            break;
+        }
+    }
+')
+
+if [ -z "${NAMESPACE}" ]; then
+    echo -e "${RED}Error: Could not determine namespace from composer.json${NC}"
+    exit 1
+fi
+
+# Determine test file path
+TEST_FILE="${TEST_DIR}/${CLASS_NAME}${TEST_SUFFIX}.php"
+
+# Check if file already exists
+if [ -f "${TEST_FILE}" ]; then
+    echo -e "${RED}Error: Test file already exists: ${TEST_FILE}${NC}"
+    exit 1
+fi
+
+# Create test file directory if needed
+mkdir -p "$(dirname "${TEST_FILE}")"
+
+echo -e "${GREEN}Generating ${TEST_TYPE} test for ${CLASS_NAME}...${NC}"
+
+# Generate test class based on type
+case ${TEST_TYPE} in
+    unit)
+        cat > "${TEST_FILE}" << EOF
+<?php
+
+declare(strict_types=1);
+
+namespace ${NAMESPACE}\\Tests\\Unit;
+
+use TYPO3\\TestingFramework\\Core\\Unit\\UnitTestCase;
+use ${NAMESPACE}\\${CLASS_NAME};
+
+/**
+ * Unit test for ${CLASS_NAME}
+ */
+final class ${CLASS_NAME}${TEST_SUFFIX} extends UnitTestCase
+{
+    protected ${CLASS_NAME} \$subject;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+        \$this->subject = new ${CLASS_NAME}();
+    }
+
+    /**
+     * @test
+     */
+    public function canBeInstantiated(): void
+    {
+        self::assertInstanceOf(${CLASS_NAME}::class, \$this->subject);
+    }
+}
+EOF
+        ;;
+
+    functional)
+        cat > "${TEST_FILE}" << EOF
+<?php
+
+declare(strict_types=1);
+
+namespace ${NAMESPACE}\\Tests\\Functional;
+
+use TYPO3\\TestingFramework\\Core\\Functional\\FunctionalTestCase;
+use ${NAMESPACE}\\${CLASS_NAME};
+
+/**
+ * Functional test for ${CLASS_NAME}
+ */
+final class ${CLASS_NAME}${TEST_SUFFIX} extends FunctionalTestCase
+{
+    protected ${CLASS_NAME} \$subject;
+
+    protected array \$testExtensionsToLoad = [
+        'typo3conf/ext/your_extension',
+    ];
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+        \$this->subject = \$this->get(${CLASS_NAME}::class);
+    }
+
+    /**
+     * @test
+     */
+    public function canBeInstantiated(): void
+    {
+        self::assertInstanceOf(${CLASS_NAME}::class, \$this->subject);
+    }
+}
+EOF
+
+        # Create fixture file
+        FIXTURE_FILE="${PROJECT_DIR}/Tests/Functional/Fixtures/${CLASS_NAME}.csv"
+        if [ ! -f "${FIXTURE_FILE}" ]; then
+            echo "# Fixture for ${CLASS_NAME}${TEST_SUFFIX}" > "${FIXTURE_FILE}"
+            echo -e "${GREEN}✓ Created fixture: ${FIXTURE_FILE}${NC}"
+        fi
+        ;;
+
+    acceptance)
+        cat > "${TEST_FILE}" << EOF
+<?php
+
+declare(strict_types=1);
+
+namespace ${NAMESPACE}\\Tests\\Acceptance;
+
+use ${NAMESPACE}\\Tests\\Acceptance\\AcceptanceTester;
+
+/**
+ * Acceptance test for ${CLASS_NAME/Cest/} workflow
+ */
+final class ${CLASS_NAME}${TEST_SUFFIX}
+{
+    public function _before(AcceptanceTester \$I): void
+    {
+        // Setup before each test
+    }
+
+    public function exampleTest(AcceptanceTester \$I): void
+    {
+        \$I->amOnPage('/');
+        \$I->see('Welcome');
+    }
+}
+EOF
+        ;;
+esac
+
+echo -e "${GREEN}✓ Created: ${TEST_FILE}${NC}"
+echo
+echo "Run test:"
+echo "  vendor/bin/phpunit ${TEST_FILE}"
+echo
+echo "Or via composer:"
+echo "  composer ci:test:php:${TEST_TYPE}"
--- a/scripts/setup-testing.sh
+++ b/scripts/setup-testing.sh
@@ -0,0 +1,180 @@
+#!/usr/bin/env bash
+
+#
+# Setup TYPO3 testing infrastructure
+#
+# This script initializes testing infrastructure for TYPO3 extensions:
+# - Composer dependencies
+# - PHPUnit configurations
+# - Directory structure
+# - Optional: Docker Compose for acceptance tests
+#
+
+set -e
+
+# Colors
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m' # No Color
+
+# Script configuration
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+SKILL_DIR="$(cd "${SCRIPT_DIR}/.." && pwd)"
+PROJECT_DIR="$(pwd)"
+
+WITH_ACCEPTANCE=false
+
+# Parse arguments
+while getopts ":a" opt; do
+    case ${opt} in
+        a)
+            WITH_ACCEPTANCE=true
+            ;;
+        \?)
+            echo "Usage: $0 [-a]"
+            echo "  -a    Include acceptance testing setup (Docker Compose, Codeception)"
+            exit 1
+            ;;
+    esac
+done
+
+echo -e "${GREEN}=== TYPO3 Testing Infrastructure Setup ===${NC}"
+echo
+
+# Check if composer.json exists
+if [ ! -f "${PROJECT_DIR}/composer.json" ]; then
+    echo -e "${RED}Error: composer.json not found in current directory${NC}"
+    echo "Please run this script from your TYPO3 extension root directory"
+    exit 1
+fi
+
+# 1. Install testing framework dependencies
+echo -e "${YELLOW}[1/6] Installing testing framework dependencies...${NC}"
+if ! grep -q "typo3/testing-framework" "${PROJECT_DIR}/composer.json"; then
+    composer require --dev "typo3/testing-framework:^8.0 || ^9.0" --no-update
+    echo -e "${GREEN}✓ Added typo3/testing-framework${NC}"
+else
+    echo -e "${GREEN}✓ typo3/testing-framework already present${NC}"
+fi
+
+# Install PHPUnit if not present
+if ! grep -q "phpunit/phpunit" "${PROJECT_DIR}/composer.json"; then
+    composer require --dev "phpunit/phpunit:^10.5 || ^11.0" --no-update
+    echo -e "${GREEN}✓ Added phpunit/phpunit${NC}"
+fi
+
+composer update --no-progress
+
+# 2. Create directory structure
+echo -e "${YELLOW}[2/6] Creating directory structure...${NC}"
+mkdir -p "${PROJECT_DIR}/Tests/Unit"
+mkdir -p "${PROJECT_DIR}/Tests/Functional/Fixtures"
+mkdir -p "${PROJECT_DIR}/Build/phpunit"
+mkdir -p "${PROJECT_DIR}/Build/Scripts"
+echo -e "${GREEN}✓ Directories created${NC}"
+
+# 3. Copy PHPUnit configurations
+echo -e "${YELLOW}[3/6] Installing PHPUnit configurations...${NC}"
+if [ ! -f "${PROJECT_DIR}/Build/phpunit/UnitTests.xml" ]; then
+    cp "${SKILL_DIR}/templates/UnitTests.xml" "${PROJECT_DIR}/Build/phpunit/"
+    echo -e "${GREEN}✓ Created UnitTests.xml${NC}"
+else
+    echo -e "${YELLOW}⚠ UnitTests.xml already exists (skipped)${NC}"
+fi
+
+if [ ! -f "${PROJECT_DIR}/Build/phpunit/FunctionalTests.xml" ]; then
+    cp "${SKILL_DIR}/templates/FunctionalTests.xml" "${PROJECT_DIR}/Build/phpunit/"
+    echo -e "${GREEN}✓ Created FunctionalTests.xml${NC}"
+else
+    echo -e "${YELLOW}⚠ FunctionalTests.xml already exists (skipped)${NC}"
+fi
+
+if [ ! -f "${PROJECT_DIR}/Build/phpunit/FunctionalTestsBootstrap.php" ]; then
+    cp "${SKILL_DIR}/templates/FunctionalTestsBootstrap.php" "${PROJECT_DIR}/Build/phpunit/"
+    echo -e "${GREEN}✓ Created FunctionalTestsBootstrap.php${NC}"
+else
+    echo -e "${YELLOW}⚠ FunctionalTestsBootstrap.php already exists (skipped)${NC}"
+fi
+
+# 4. Create AGENTS.md templates
+echo -e "${YELLOW}[4/6] Creating AGENTS.md templates...${NC}"
+for dir in "${PROJECT_DIR}/Tests/Unit" "${PROJECT_DIR}/Tests/Functional"; do
+    if [ ! -f "${dir}/AGENTS.md" ]; then
+        cp "${SKILL_DIR}/templates/AGENTS.md" "${dir}/"
+        echo -e "${GREEN}✓ Created ${dir}/AGENTS.md${NC}"
+    else
+        echo -e "${YELLOW}⚠ ${dir}/AGENTS.md already exists (skipped)${NC}"
+    fi
+done
+
+# 5. Setup composer scripts
+echo -e "${YELLOW}[5/6] Adding composer test scripts...${NC}"
+if ! grep -q "ci:test:php:unit" "${PROJECT_DIR}/composer.json"; then
+    echo -e "${GREEN}ℹ Add these scripts to your composer.json:${NC}"
+    cat << 'EOF'
+
+"scripts": {
+    "ci:test": [
+        "@ci:test:php:lint",
+        "@ci:test:php:phpstan",
+        "@ci:test:php:unit",
+        "@ci:test:php:functional"
+    ],
+    "ci:test:php:lint": "phplint",
+    "ci:test:php:phpstan": "phpstan analyze --configuration Build/phpstan.neon --no-progress",
+    "ci:test:php:unit": "phpunit -c Build/phpunit/UnitTests.xml",
+    "ci:test:php:functional": "phpunit -c Build/phpunit/FunctionalTests.xml"
+}
+EOF
+else
+    echo -e "${GREEN}✓ Test scripts already configured${NC}"
+fi
+
+# 6. Setup acceptance testing if requested
+if [ "${WITH_ACCEPTANCE}" = true ]; then
+    echo -e "${YELLOW}[6/6] Setting up acceptance testing...${NC}"
+
+    # Install Codeception
+    if ! grep -q "codeception/codeception" "${PROJECT_DIR}/composer.json"; then
+        composer require --dev codeception/codeception codeception/module-webdriver --no-update
+        composer update --no-progress
+        echo -e "${GREEN}✓ Installed Codeception${NC}"
+    fi
+
+    # Create acceptance test directory
+    mkdir -p "${PROJECT_DIR}/Tests/Acceptance"
+
+    # Copy Docker Compose and Codeception config
+    if [ ! -f "${PROJECT_DIR}/Build/docker-compose.yml" ]; then
+        cp "${SKILL_DIR}/templates/docker/docker-compose.yml" "${PROJECT_DIR}/Build/"
+        echo -e "${GREEN}✓ Created docker-compose.yml${NC}"
+    fi
+
+    if [ ! -f "${PROJECT_DIR}/codeception.yml" ]; then
+        cp "${SKILL_DIR}/templates/docker/codeception.yml" "${PROJECT_DIR}/"
+        echo -e "${GREEN}✓ Created codeception.yml${NC}"
+    fi
+
+    # Initialize Codeception
+    if [ ! -d "${PROJECT_DIR}/Tests/Acceptance/_support" ]; then
+        vendor/bin/codecept bootstrap
+        echo -e "${GREEN}✓ Initialized Codeception${NC}"
+    fi
+else
+    echo -e "${YELLOW}[6/6] Skipping acceptance testing setup (use -a flag to include)${NC}"
+fi
+
+echo
+echo -e "${GREEN}=== Setup Complete ===${NC}"
+echo
+echo "Next steps:"
+echo "1. Generate your first test:"
+echo "   ${SKILL_DIR}/scripts/generate-test.sh unit MyClass"
+echo
+echo "2. Run tests:"
+echo "   composer ci:test:php:unit"
+echo "   composer ci:test:php:functional"
+echo
+echo "3. Add CI/CD workflow (optional):"
+echo "   cp ${SKILL_DIR}/templates/github-actions-tests.yml .github/workflows/tests.yml"
--- a/scripts/validate-setup.sh
+++ b/scripts/validate-setup.sh
@@ -0,0 +1,135 @@
+#!/usr/bin/env bash
+
+#
+# Validate TYPO3 testing infrastructure setup
+#
+# Checks:
+# - Required dependencies
+# - PHPUnit configurations
+# - Directory structure
+# - Docker (for acceptance tests)
+#
+
+set -e
+
+# Colors
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m'
+
+PROJECT_DIR="$(pwd)"
+ERRORS=0
+WARNINGS=0
+
+echo -e "${GREEN}=== TYPO3 Testing Setup Validation ===${NC}"
+echo
+
+# Check composer.json
+echo -e "${YELLOW}[1/5] Checking composer.json dependencies...${NC}"
+if [ ! -f "${PROJECT_DIR}/composer.json" ]; then
+    echo -e "${RED}✗ composer.json not found${NC}"
+    ((ERRORS++))
+else
+    if grep -q "typo3/testing-framework" "${PROJECT_DIR}/composer.json"; then
+        echo -e "${GREEN}✓ typo3/testing-framework installed${NC}"
+    else
+        echo -e "${RED}✗ typo3/testing-framework missing${NC}"
+        ((ERRORS++))
+    fi
+
+    if grep -q "phpunit/phpunit" "${PROJECT_DIR}/composer.json"; then
+        echo -e "${GREEN}✓ phpunit/phpunit installed${NC}"
+    else
+        echo -e "${RED}✗ phpunit/phpunit missing${NC}"
+        ((ERRORS++))
+    fi
+fi
+
+# Check PHPUnit configurations
+echo -e "${YELLOW}[2/5] Checking PHPUnit configurations...${NC}"
+if [ -f "${PROJECT_DIR}/Build/phpunit/UnitTests.xml" ]; then
+    echo -e "${GREEN}✓ UnitTests.xml present${NC}"
+else
+    echo -e "${RED}✗ UnitTests.xml missing${NC}"
+    ((ERRORS++))
+fi
+
+if [ -f "${PROJECT_DIR}/Build/phpunit/FunctionalTests.xml" ]; then
+    echo -e "${GREEN}✓ FunctionalTests.xml present${NC}"
+else
+    echo -e "${RED}✗ FunctionalTests.xml missing${NC}"
+    ((ERRORS++))
+fi
+
+if [ -f "${PROJECT_DIR}/Build/phpunit/FunctionalTestsBootstrap.php" ]; then
+    echo -e "${GREEN}✓ FunctionalTestsBootstrap.php present${NC}"
+else
+    echo -e "${RED}✗ FunctionalTestsBootstrap.php missing${NC}"
+    ((ERRORS++))
+fi
+
+# Check directory structure
+echo -e "${YELLOW}[3/5] Checking directory structure...${NC}"
+for dir in "Tests/Unit" "Tests/Functional" "Tests/Functional/Fixtures"; do
+    if [ -d "${PROJECT_DIR}/${dir}" ]; then
+        echo -e "${GREEN}✓ ${dir}/ exists${NC}"
+    else
+        echo -e "${YELLOW}⚠ ${dir}/ missing${NC}"
+        ((WARNINGS++))
+    fi
+done
+
+# Check AGENTS.md files
+echo -e "${YELLOW}[4/5] Checking AGENTS.md documentation...${NC}"
+for dir in "Tests/Unit" "Tests/Functional"; do
+    if [ -f "${PROJECT_DIR}/${dir}/AGENTS.md" ]; then
+        echo -e "${GREEN}✓ ${dir}/AGENTS.md present${NC}"
+    else
+        echo -e "${YELLOW}⚠ ${dir}/AGENTS.md missing${NC}"
+        ((WARNINGS++))
+    fi
+done
+
+# Check Docker (optional, for acceptance tests)
+echo -e "${YELLOW}[5/5] Checking Docker availability (for acceptance tests)...${NC}"
+if command -v docker &> /dev/null; then
+    echo -e "${GREEN}✓ Docker installed${NC}"
+
+    if docker ps &> /dev/null; then
+        echo -e "${GREEN}✓ Docker daemon running${NC}"
+    else
+        echo -e "${YELLOW}⚠ Docker daemon not running${NC}"
+        ((WARNINGS++))
+    fi
+else
+    echo -e "${YELLOW}⚠ Docker not installed (required for acceptance tests)${NC}"
+    ((WARNINGS++))
+fi
+
+# Summary
+echo
+echo -e "${GREEN}=== Validation Summary ===${NC}"
+
+if [ ${ERRORS} -eq 0 ] && [ ${WARNINGS} -eq 0 ]; then
+    echo -e "${GREEN}✓ All checks passed!${NC}"
+    echo
+    echo "Your testing infrastructure is ready to use."
+    echo "Generate your first test:"
+    echo "  ~/.claude/skills/typo3-testing/scripts/generate-test.sh unit MyClass"
+    exit 0
+elif [ ${ERRORS} -eq 0 ]; then
+    echo -e "${YELLOW}⚠ ${WARNINGS} warnings found${NC}"
+    echo
+    echo "Basic setup is complete, but some optional components are missing."
+    exit 0
+else
+    echo -e "${RED}✗ ${ERRORS} errors found${NC}"
+    if [ ${WARNINGS} -gt 0 ]; then
+        echo -e "${YELLOW}⚠ ${WARNINGS} warnings found${NC}"
+    fi
+    echo
+    echo "Run setup script to fix errors:"
+    echo "  ~/.claude/skills/typo3-testing/scripts/setup-testing.sh"
+    exit 1
+fi
--- a/templates/AGENTS.md
+++ b/templates/AGENTS.md
@@ -0,0 +1,154 @@
+# Testing Context for AI Assistants
+
+This directory contains tests for the TYPO3 extension.
+
+## Test Type
+
+**[Unit|Functional|Acceptance]** tests
+
+## Test Strategy
+
+<!-- Describe what this directory tests and why -->
+<!-- Example: "Unit tests for domain models - validates business logic without database" -->
+<!-- Example: "Functional tests for repositories - verifies database queries and persistence" -->
+<!-- Example: "Acceptance tests for checkout workflow - validates complete user journey from cart to payment" -->
+
+**Scope:**
+
+**Key Scenarios:**
+
+**Not Covered:** <!-- What is intentionally not tested here -->
+
+## Testing Framework
+
+- **TYPO3 Testing Framework** (typo3/testing-framework)
+- **PHPUnit** for assertions and test execution
+- **[Additional tools for this test type]:**
+  - Unit: Prophecy for mocking
+  - Functional: CSV fixtures for database data
+  - Acceptance: Codeception + Selenium for browser automation
+
+## Test Structure
+
+### Base Class
+
+Tests in this directory extend:
+- **Unit**: `TYPO3\TestingFramework\Core\Unit\UnitTestCase`
+- **Functional**: `TYPO3\TestingFramework\Core\Functional\FunctionalTestCase`
+- **Acceptance**: Codeception Cest classes
+
+### Naming Convention
+
+- **Unit/Functional**: `*Test.php` (e.g., `ProductTest.php`, `ProductRepositoryTest.php`)
+- **Acceptance**: `*Cest.php` (e.g., `LoginCest.php`, `CheckoutCest.php`)
+
+## Key Patterns
+
+### setUp() and tearDown()
+
+```php
+protected function setUp(): void
+{
+    parent::setUp();
+    // Initialize test dependencies
+}
+
+protected function tearDown(): void
+{
+    // Clean up resources
+    parent::tearDown();
+}
+```
+
+### Assertions
+
+Use specific assertions over generic ones:
+- `self::assertTrue()`, `self::assertFalse()` for booleans
+- `self::assertSame()` for strict equality
+- `self::assertInstanceOf()` for type checks
+- `self::assertCount()` for arrays/collections
+
+### Fixtures (Functional Tests Only)
+
+```php
+$this->importCSVDataSet(__DIR__ . '/../Fixtures/MyFixture.csv');
+```
+
+**Fixture Files:** `Tests/Functional/Fixtures/`
+
+**Strategy:**
+- Keep fixtures minimal (only required data)
+- One fixture per test scenario
+- Document fixture contents in test or below
+
+### Mocking (Unit Tests Only)
+
+```php
+use Prophecy\PhpUnit\ProphecyTrait;
+
+$repository = $this->prophesize(UserRepository::class);
+$repository->findByEmail('test@example.com')->willReturn($user);
+```
+
+## Running Tests
+
+```bash
+# All tests in this directory
+composer ci:test:php:[unit|functional|acceptance]
+
+# Via runTests.sh
+Build/Scripts/runTests.sh -s [unit|functional|acceptance]
+
+# Specific test file
+vendor/bin/phpunit Tests/[Unit|Functional]/Path/To/TestFile.php
+
+# Specific test method
+vendor/bin/phpunit --filter testMethodName
+```
+
+## Fixtures Documentation (Functional Tests)
+
+<!-- Document what each fixture contains -->
+
+### `Fixtures/BasicProducts.csv`
+- 3 products in category 1
+- 2 products in category 2
+- All products visible and published
+
+### `Fixtures/PageTree.csv`
+- Root page (uid: 1)
+- Products page (uid: 2, pid: 1)
+- Services page (uid: 3, pid: 1)
+
+## Test Dependencies
+
+<!-- List any special dependencies or requirements -->
+
+- [ ] Database (functional tests only)
+- [ ] Docker (acceptance tests only)
+- [ ] Specific TYPO3 extensions: <!-- list if any -->
+- [ ] External services: <!-- list if any -->
+
+## Common Issues
+
+<!-- Document common test failures and solutions -->
+
+**Database connection errors:**
+- Verify database driver configuration in `FunctionalTests.xml`
+- Check Docker database service is running
+
+**Fixture import errors:**
+- Verify CSV format (proper escaping, matching table structure)
+- Check file paths are correct relative to test class
+
+**Flaky tests:**
+- Use proper waits in acceptance tests (`waitForElement`)
+- Avoid timing dependencies in unit/functional tests
+- Ensure test independence (no shared state)
+
+## Resources
+
+- [Unit Testing Guide](~/.claude/skills/typo3-testing/references/unit-testing.md)
+- [Functional Testing Guide](~/.claude/skills/typo3-testing/references/functional-testing.md)
+- [Acceptance Testing Guide](~/.claude/skills/typo3-testing/references/acceptance-testing.md)
+- [TYPO3 Testing Documentation](https://docs.typo3.org/m/typo3/reference-coreapi/main/en-us/Testing/)
--- a/templates/FunctionalTests.xml
+++ b/templates/FunctionalTests.xml
@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:noNamespaceSchemaLocation="../../vendor/phpunit/phpunit.xsd"
+    bootstrap="FunctionalTestsBootstrap.php"
+    cacheResult="false"
+    beStrictAboutTestsThatDoNotTestAnything="true"
+    beStrictAboutOutputDuringTests="true"
+    failOnDeprecation="true"
+    failOnNotice="true"
+    failOnWarning="true"
+    failOnRisky="true"
+    colors="true">
+    <testsuites>
+        <testsuite name="Functional tests">
+            <directory>../../Tests/Functional/</directory>
+        </testsuite>
+    </testsuites>
+    <php>
+        <const name="TYPO3_TESTING_FUNCTIONAL_REMOVE_ERROR_HANDLER" value="true" />
+        <env name="TYPO3_CONTEXT" value="Testing"/>
+        <env name="typo3DatabaseDriver" value="mysqli" force="true"/>
+        <env name="typo3DatabaseHost" value="localhost" force="true"/>
+        <env name="typo3DatabasePort" value="3306" force="true"/>
+        <env name="typo3DatabaseName" value="typo3_test" force="true"/>
+        <env name="typo3DatabaseUsername" value="root" force="true"/>
+        <env name="typo3DatabasePassword" value="" force="true"/>
+    </php>
+    <coverage>
+        <report>
+            <clover outputFile="../../var/log/coverage/clover.xml"/>
+            <html outputDirectory="../../var/log/coverage/html"/>
+            <text outputFile="php://stdout" showOnlySummary="true"/>
+        </report>
+    </coverage>
+</phpunit>
--- a/templates/FunctionalTestsBootstrap.php
+++ b/templates/FunctionalTestsBootstrap.php
@@ -0,0 +1,21 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * Bootstrap file for TYPO3 functional tests
+ *
+ * This file initializes the testing environment for functional tests.
+ * It sets up the necessary directory structure and prepares the TYPO3 instance.
+ */
+
+call_user_func(static function () {
+    $testbase = new \TYPO3\TestingFramework\Core\Testbase();
+
+    // Define original root path
+    $testbase->defineOriginalRootPath();
+
+    // Create necessary directories for test execution
+    $testbase->createDirectory(ORIGINAL_ROOT . 'typo3temp/var/tests');
+    $testbase->createDirectory(ORIGINAL_ROOT . 'typo3temp/var/transient');
+});
--- a/templates/UnitTests.xml
+++ b/templates/UnitTests.xml
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:noNamespaceSchemaLocation="../../vendor/phpunit/phpunit/phpunit.xsd"
+    bootstrap="../../vendor/autoload.php"
+    cacheResult="false"
+    beStrictAboutTestsThatDoNotTestAnything="true"
+    beStrictAboutOutputDuringTests="true"
+    failOnDeprecation="true"
+    failOnNotice="true"
+    failOnWarning="true"
+    failOnRisky="true"
+    colors="true">
+    <testsuites>
+        <testsuite name="Unit tests">
+            <directory>../../Tests/Unit/</directory>
+        </testsuite>
+    </testsuites>
+    <coverage>
+        <report>
+            <clover outputFile="../../var/log/coverage/clover.xml"/>
+            <html outputDirectory="../../var/log/coverage/html"/>
+            <text outputFile="php://stdout" showOnlySummary="true"/>
+        </report>
+    </coverage>
+</phpunit>
--- a/templates/docker/codeception.yml
+++ b/templates/docker/codeception.yml
@@ -0,0 +1,39 @@
+paths:
+    tests: Tests/Acceptance
+    output: var/log/acceptance
+    data: Tests/Acceptance/_data
+    support: Tests/Acceptance/_support
+    envs: Tests/Acceptance/_envs
+
+actor_suffix: Tester
+
+extensions:
+    enabled:
+        - Codeception\Extension\RunFailed
+
+suites:
+    acceptance:
+        actor: AcceptanceTester
+        path: .
+        modules:
+            enabled:
+                - WebDriver:
+                    url: http://web:8000
+                    browser: chrome
+                    host: selenium
+                    port: 4444
+                    wait: 2
+                    window_size: 1920x1080
+                    capabilities:
+                        chromeOptions:
+                            args: ["--no-sandbox", "--disable-dev-shm-usage"]
+                - \\Helper\\Acceptance
+            config:
+                WebDriver:
+                    browser: '%BROWSER%'
+
+settings:
+    shuffle: false
+    lint: true
+    colors: true
+    memory_limit: 1024M
--- a/templates/docker/docker-compose.yml
+++ b/templates/docker/docker-compose.yml
@@ -0,0 +1,51 @@
+services:
+  web:
+    image: php:8.4-apache
+    container_name: typo3-test-web
+    volumes:
+      - ../../../:/var/www/html
+    ports:
+      - "8000:80"
+    environment:
+      - TYPO3_CONTEXT=Testing
+      - typo3DatabaseDriver=mysqli
+      - typo3DatabaseHost=db
+      - typo3DatabaseName=typo3_test
+      - typo3DatabaseUsername=typo3
+      - typo3DatabasePassword=typo3
+    depends_on:
+      db:
+        condition: service_healthy
+    networks:
+      - typo3-test
+
+  db:
+    image: mysql:8.0
+    container_name: typo3-test-db
+    environment:
+      MYSQL_ROOT_PASSWORD: root
+      MYSQL_DATABASE: typo3_test
+      MYSQL_USER: typo3
+      MYSQL_PASSWORD: typo3
+    ports:
+      - "3306:3306"
+    healthcheck:
+      test: ["CMD", "mysqladmin", "ping", "-h", "localhost"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+    networks:
+      - typo3-test
+
+  selenium:
+    image: selenium/standalone-chrome:latest
+    container_name: typo3-test-selenium
+    ports:
+      - "4444:4444"
+    shm_size: 2gb
+    networks:
+      - typo3-test
+
+networks:
+  typo3-test:
+    driver: bridge
--- a/templates/example-tests/ExampleAcceptanceCest.php
+++ b/templates/example-tests/ExampleAcceptanceCest.php
@@ -0,0 +1,87 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Vendor\Extension\Tests\Acceptance;
+
+use Vendor\Extension\Tests\Acceptance\AcceptanceTester;
+
+/**
+ * Example acceptance test demonstrating TYPO3 testing patterns
+ *
+ * Acceptance tests use a real browser to test complete user workflows.
+ * They verify frontend functionality and user interactions.
+ */
+final class LoginCest
+{
+    public function _before(AcceptanceTester $I): void
+    {
+        // Runs before each test method
+        // Setup: Import fixtures, reset state, etc.
+    }
+
+    public function loginAsBackendUser(AcceptanceTester $I): void
+    {
+        // Navigate to login page
+        $I->amOnPage('/typo3');
+
+        // Fill login form
+        $I->fillField('username', 'admin');
+        $I->fillField('password', 'password');
+
+        // Submit form
+        $I->click('Login');
+
+        // Verify successful login
+        $I->see('Dashboard');
+        $I->seeInCurrentUrl('/typo3/module/dashboard');
+    }
+
+    public function loginFailsWithInvalidCredentials(AcceptanceTester $I): void
+    {
+        $I->amOnPage('/typo3');
+
+        $I->fillField('username', 'admin');
+        $I->fillField('password', 'wrong_password');
+        $I->click('Login');
+
+        // Verify login failed
+        $I->see('Login error');
+        $I->seeInCurrentUrl('/typo3');
+    }
+
+    public function searchesForProducts(AcceptanceTester $I): void
+    {
+        // Navigate to product listing
+        $I->amOnPage('/products');
+
+        // Wait for page to load
+        $I->waitForElement('.product-list', 5);
+
+        // Use search
+        $I->fillField('#search', 'laptop');
+        $I->click('Search');
+
+        // Wait for results
+        $I->waitForElement('.search-results', 5);
+
+        // Verify search results
+        $I->see('laptop', '.product-title');
+        $I->seeNumberOfElements('.product-item', [1, 10]);
+    }
+
+    public function addsProductToCart(AcceptanceTester $I): void
+    {
+        $I->amOnPage('/products/1');
+
+        // Click add to cart button
+        $I->click('#add-to-cart');
+
+        // Wait for AJAX response
+        $I->waitForElement('.cart-badge', 3);
+
+        // Verify cart updated
+        $I->see('1', '.cart-badge');
+        $I->see('Product added to cart');
+    }
+}
--- a/templates/example-tests/ExampleFunctionalTest.php
+++ b/templates/example-tests/ExampleFunctionalTest.php
@@ -0,0 +1,91 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Vendor\Extension\Tests\Functional\Domain\Repository;
+
+use TYPO3\TestingFramework\Core\Functional\FunctionalTestCase;
+use Vendor\Extension\Domain\Model\Product;
+use Vendor\Extension\Domain\Repository\ProductRepository;
+
+/**
+ * Example functional test demonstrating TYPO3 testing patterns
+ *
+ * Functional tests use a real database and full TYPO3 instance.
+ * They test repositories, controllers, and integration scenarios.
+ */
+final class ProductRepositoryTest extends FunctionalTestCase
+{
+    protected ProductRepository $subject;
+
+    /**
+     * Extensions to load for this test
+     */
+    protected array $testExtensionsToLoad = [
+        'typo3conf/ext/my_extension',
+    ];
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        // Get repository from dependency injection container
+        $this->subject = $this->get(ProductRepository::class);
+    }
+
+    /**
+     * @test
+     */
+    public function findsProductsByCategory(): void
+    {
+        // Import test data from CSV fixture
+        $this->importCSVDataSet(__DIR__ . '/../Fixtures/Products.csv');
+
+        // Execute repository method
+        $products = $this->subject->findByCategory(1);
+
+        // Assert results
+        self::assertCount(3, $products);
+        self::assertInstanceOf(Product::class, $products[0]);
+    }
+
+    /**
+     * @test
+     */
+    public function findsVisibleProductsOnly(): void
+    {
+        $this->importCSVDataSet(__DIR__ . '/../Fixtures/ProductsWithHidden.csv');
+
+        $products = $this->subject->findAll();
+
+        // Only visible products should be returned
+        self::assertCount(2, $products);
+
+        foreach ($products as $product) {
+            self::assertFalse($product->isHidden());
+        }
+    }
+
+    /**
+     * @test
+     */
+    public function persistsNewProduct(): void
+    {
+        $this->importCSVDataSet(__DIR__ . '/../Fixtures/Pages.csv');
+
+        $product = new Product();
+        $product->setTitle('New Product');
+        $product->setPrice(19.99);
+        $product->setPid(1);
+
+        $this->subject->add($product);
+
+        // Persist to database
+        $this->persistenceManager->persistAll();
+
+        // Verify product was saved
+        $savedProducts = $this->subject->findAll();
+        self::assertCount(1, $savedProducts);
+        self::assertSame('New Product', $savedProducts[0]->getTitle());
+    }
+}
--- a/templates/example-tests/ExampleUnitTest.php
+++ b/templates/example-tests/ExampleUnitTest.php
@@ -0,0 +1,66 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Vendor\Extension\Tests\Unit\Domain\Validator;
+
+use TYPO3\TestingFramework\Core\Unit\UnitTestCase;
+use Vendor\Extension\Domain\Validator\EmailValidator;
+
+/**
+ * Example unit test demonstrating TYPO3 testing patterns
+ *
+ * Unit tests are fast, isolated tests without external dependencies.
+ * They test individual components (validators, utilities, domain logic).
+ */
+final class EmailValidatorTest extends UnitTestCase
+{
+    protected EmailValidator $subject;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+        $this->subject = new EmailValidator();
+    }
+
+    /**
+     * @test
+     */
+    public function validEmailPassesValidation(): void
+    {
+        $result = $this->subject->validate('user@example.com');
+
+        self::assertFalse($result->hasErrors());
+    }
+
+    /**
+     * @test
+     */
+    public function invalidEmailFailsValidation(): void
+    {
+        $result = $this->subject->validate('invalid-email');
+
+        self::assertTrue($result->hasErrors());
+    }
+
+    /**
+     * @test
+     * @dataProvider invalidEmailProvider
+     */
+    public function rejectsInvalidEmails(string $email): void
+    {
+        $result = $this->subject->validate($email);
+
+        self::assertTrue($result->hasErrors(), "Email '$email' should be invalid");
+    }
+
+    public static function invalidEmailProvider(): array
+    {
+        return [
+            'missing @' => ['userexample.com'],
+            'missing domain' => ['user@'],
+            'empty string' => [''],
+            'spaces' => ['user @example.com'],
+        ];
+    }
+}
--- a/templates/github-actions-tests.yml
+++ b/templates/github-actions-tests.yml
@@ -0,0 +1,215 @@
+name: Tests
+
+on:
+  push:
+    branches: [main, develop]
+  pull_request:
+    branches: [main]
+
+jobs:
+  lint:
+    name: PHP Lint
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php: ['8.1', '8.2', '8.3', '8.4']
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup PHP ${{ matrix.php }}
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+
+      - name: Get Composer Cache Directory
+        id: composer-cache
+        run: echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
+
+      - name: Cache Composer dependencies
+        uses: actions/cache@v3
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - name: Install dependencies
+        run: composer install --no-progress --prefer-dist
+
+      - name: Run PHP linting
+        run: composer ci:test:php:lint
+
+  phpstan:
+    name: PHPStan (Latest PHP)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.4'
+
+      - name: Cache Composer dependencies
+        uses: actions/cache@v3
+        with:
+          path: ~/.composer/cache
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+
+      - name: Install dependencies
+        run: composer install --no-progress
+
+      - name: Run PHPStan
+        run: composer ci:test:php:phpstan
+
+  security:
+    name: Security Audit
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.4'
+
+      - name: Cache Composer dependencies
+        uses: actions/cache@v3
+        with:
+          path: ~/.composer/cache
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+
+      - name: Install dependencies
+        run: composer install --no-progress
+
+      - name: Run Composer audit
+        run: composer audit
+
+  cgl:
+    name: Code Style
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.4'
+
+      - name: Cache Composer dependencies
+        uses: actions/cache@v3
+        with:
+          path: ~/.composer/cache
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+
+      - name: Install dependencies
+        run: composer install --no-progress
+
+      - name: Check code style
+        run: composer ci:test:php:cgl
+
+  unit:
+    name: Unit Tests (PHP ${{ matrix.php }})
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php: ['8.1', '8.2', '8.3', '8.4']
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup PHP ${{ matrix.php }}
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          coverage: xdebug
+
+      - name: Cache Composer dependencies
+        uses: actions/cache@v3
+        with:
+          path: ~/.composer/cache
+          key: ${{ runner.os }}-php${{ matrix.php }}-composer-${{ hashFiles('**/composer.lock') }}
+
+      - name: Install dependencies
+        run: composer install --no-progress
+
+      - name: Run unit tests
+        run: composer ci:test:php:unit
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v3
+        with:
+          files: ./var/log/coverage/clover.xml
+          flags: unittests
+          name: unit-tests-php-${{ matrix.php }}
+
+  functional:
+    name: Functional Tests (PHP ${{ matrix.php }}, ${{ matrix.database }})
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php: ['8.1', '8.2', '8.3', '8.4']
+        database: ['mysqli', 'pdo_mysql', 'postgres', 'sqlite']
+        exclude:
+          # Reduce matrix for faster execution
+          - php: '8.2'
+            database: 'pdo_mysql'
+          - php: '8.3'
+            database: 'postgres'
+          - php: '8.4'
+            database: 'pdo_mysql'
+
+    services:
+      mysql:
+        image: mysql:8.0
+        env:
+          MYSQL_ROOT_PASSWORD: root
+          MYSQL_DATABASE: typo3_test
+        ports:
+          - 3306:3306
+        options: >-
+          --health-cmd="mysqladmin ping"
+          --health-interval=10s
+          --health-timeout=5s
+          --health-retries=3
+
+      postgres:
+        image: postgres:15
+        env:
+          POSTGRES_PASSWORD: postgres
+          POSTGRES_DB: typo3_test
+        ports:
+          - 5432:5432
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup PHP ${{ matrix.php }}
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          extensions: ${{ matrix.database == 'postgres' && 'pdo_pgsql' || 'mysqli' }}
+
+      - name: Cache Composer dependencies
+        uses: actions/cache@v3
+        with:
+          path: ~/.composer/cache
+          key: ${{ runner.os }}-php${{ matrix.php }}-composer-${{ hashFiles('**/composer.lock') }}
+
+      - name: Install dependencies
+        run: composer install --no-progress
+
+      - name: Run functional tests
+        env:
+          typo3DatabaseDriver: ${{ matrix.database }}
+          typo3DatabaseHost: 127.0.0.1
+          typo3DatabaseName: typo3_test
+          typo3DatabaseUsername: ${{ matrix.database == 'postgres' && 'postgres' || 'root' }}
+          typo3DatabasePassword: ${{ matrix.database == 'postgres' && 'postgres' || 'root' }}
+        run: composer ci:test:php:functional