diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
new file mode 100644
index 0000000..8e4dd69
--- /dev/null
+++ b/.github/workflows/lint.yml
@@ -0,0 +1,39 @@
+name: Lint
+
+on:
+  push:
+    branches: ["*"]
+  pull_request:
+    branches: ["*"]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php-versions: [8.0", "8.1", "8.2"]
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-versions }}
+
+      - name: Cache Composer dependencies
+        uses: actions/cache@v2
+        with:
+          path: /tmp/composer-cache
+          key: ${{ runner.os }}-php${{ matrix.php-versions }}-${{ hashFiles('**/composer.lock') }}
+
+      - name: Install dependencies
+        uses: php-actions/composer@v5
+        with:
+          command: install
+          args: --prefer-dist --no-progress --no-suggest --verbose
+          php_version: ${{ matrix.php-versions }}
+          version: 1
+
+      - name: Run lint
+        run: make lint
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
new file mode 100644
index 0000000..56f8ec5
--- /dev/null
+++ b/.github/workflows/tests.yml
@@ -0,0 +1,36 @@
+name: Tests
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: true
+      matrix:
+        os: [ubuntu-latest, windows-latest]
+        php: [8.2, 8.1, 8.0]
+        stability: [prefer-lowest, prefer-stable]
+
+    name: P${{ matrix.php }} - ${{ matrix.stability }} - ${{ matrix.os }}
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          extensions: dom, curl, libxml, mbstring, zip, pcntl, pdo, sqlite, pdo_sqlite, bcmath, soap, intl, gd, exif, iconv, imagick, fileinfo
+          coverage: none
+
+      - name: Setup problem matchers
+        run: |
+          echo "::add-matcher::${{ runner.tool_cache }}/php.json"
+          echo "::add-matcher::${{ runner.tool_cache }}/phpunit.json"
+      - name: Install dependencies
+        run: composer update --${{ matrix.stability }} --prefer-dist --no-interaction
+
+      - name: Execute tests
+        run: vendor/bin/phpunit
diff --git a/.php_cs b/.php_cs
new file mode 100644
index 0000000..ea44de8
--- /dev/null
+++ b/.php_cs
@@ -0,0 +1,13 @@
+<?php
+
+$finder = PhpCsFixer\Finder::create()
+    ->in(__DIR__ . '/src')
+    ->in(__DIR__ . '/tests');
+
+return PhpCsFixer\Config::create()
+    ->setUsingCache(false)
+    ->setRules([
+        '@PSR2' => true,
+        'array_syntax' => ['syntax' => 'short'],
+    ])
+    ->setFinder($finder);
diff --git a/.phpunit.result.cache b/.phpunit.result.cache
new file mode 100644
index 0000000..a0a8c40
--- /dev/null
+++ b/.phpunit.result.cache
@@ -0,0 +1 @@
+{"version":1,"defects":{"Axiostudio\\FatturaElettronica\\Tests\\AnagraficaTest::testConstructorWithNullValues":4},"times":{"Axiostudio\\FatturaElettronica\\Tests\\AnagraficaTest::testConstructor":0.002,"Axiostudio\\FatturaElettronica\\Tests\\AnagraficaTest::testConstructorWithNullValues":0.001}}
\ No newline at end of file
diff --git a/.styleci.yml b/.styleci.yml
new file mode 100644
index 0000000..f4d3cbc
--- /dev/null
+++ b/.styleci.yml
@@ -0,0 +1,4 @@
+preset: laravel
+
+disabled:
+  - single_class_element_per_statement
diff --git a/CHANGELOG.md b/CHANGELOG.md
index c746c9d..c3e03a0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,6 @@
 
 All notable changes to `fattura-elettronica` will be documented in this file
 
-## beta - 2023-11-06
+## beta - Versione Bea
 
-- initial release
+- Versione iniziale "beta" con funzionalità base
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 0000000..b146003
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,55 @@
+# Contributing
+
+Contributions are welcome.
+
+Please read and understand the contribution guide before creating an issue or pull request.
+
+## Etiquette
+
+This project is open source, and as such, the maintainers give their free time to build and maintain the source code
+held within. They make the code freely available in the hope that it will be of use to other developers. It would be
+extremely unfair for them to suffer abuse or anger for their hard work.
+
+Please be considerate towards maintainers when raising issues or presenting pull requests. Let's show the
+world that developers are civilized and selfless people.
+
+It's the duty of the maintainer to ensure that all submissions to the project are of sufficient
+quality to benefit the project. Many developers have different skillsets, strengths, and weaknesses. Respect the maintainer's decision, and do not be upset or abusive if your submission is not used.
+
+## Viability
+
+When requesting or submitting new features, first consider whether it might be useful to others. Open
+source projects are used by many developers, who may have entirely different needs to your own. Think about
+whether or not your feature is likely to be used by other users of the project.
+
+## Procedure
+
+Before filing an issue:
+
+- Attempt to replicate the problem, to ensure that it wasn't a coincidental incident.
+- Check to make sure your feature suggestion isn't already present within the project.
+- Check the pull requests tab to ensure that the bug doesn't have a fix in progress.
+- Check the pull requests tab to ensure that the feature isn't already in progress.
+
+Before submitting a pull request:
+
+- Check the codebase to ensure that your feature doesn't already exist.
+- Check the pull requests to ensure that another person hasn't already submitted the feature or fix.
+
+## Requirements
+
+If the project maintainer has any additional requirements, you will find them listed here.
+
+- **[PSR-2 Coding Standard](https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-2-coding-style-guide.md)** - The easiest way to apply the conventions is to install [PHP Code Sniffer](https://pear.php.net/package/PHP_CodeSniffer).
+
+- **Add tests!** - Your patch won't be accepted if it doesn't have tests.
+
+- **Document any change in behaviour** - Make sure the `README.md` and any other relevant documentation are kept up-to-date.
+
+- **Consider our release cycle** - We try to follow [SemVer v2.0.0](https://semver.org/). Randomly breaking public APIs is not an option.
+
+- **One pull request per feature** - If you want to do more than one thing, send multiple pull requests.
+
+- **Send coherent history** - Make sure each individual commit in your pull request is meaningful. If you had to make multiple intermediate commits while developing, please [squash them](https://www.git-scm.com/book/en/v2/Git-Tools-Rewriting-History#Changing-Multiple-Commit-Messages) before submitting.
+
+**Happy coding**!
diff --git a/composer.json b/composer.json
index 6c782d4..60953d9 100644
--- a/composer.json
+++ b/composer.json
@@ -19,6 +19,11 @@
         "spatie/array-to-xml": "^3.2",
         "symfony/validator": "^6.3"
     },
+    "require-dev": {
+        "phpunit/phpunit": "^9.0",
+        "phpmd/phpmd" : "@stable",
+        "friendsofphp/php-cs-fixer": "^2.6"
+    },
     "autoload": {
         "psr-4": {
             "Axiostudio\\FatturaElettronica\\": "src"
@@ -29,6 +34,11 @@
             "Axiostudio\\FatturaElettronica\\Tests\\": "tests"
         }
     },
+    "scripts": {
+        "test": "vendor/bin/phpunit",
+        "test-coverage": "vendor/bin/phpunit --coverage-html coverage"
+
+    },
     "config": {
         "sort-packages": true
     }
diff --git a/phpunit.xml b/phpunit.xml
new file mode 100644
index 0000000..58f4c6c
--- /dev/null
+++ b/phpunit.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" bootstrap="vendor/autoload.php" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd">
+  <coverage processUncoveredFiles="true">
+    <include>
+      <directory suffix=".php">./src/</directory>
+    </include>
+  </coverage>
+  <testsuites>
+    <testsuite name="Fattura Elettronica">
+      <directory suffix=".php">./tests/</directory>
+    </testsuite>
+  </testsuites>
+</phpunit>
diff --git a/tests/AnagraficaTest.php b/tests/AnagraficaTest.php
new file mode 100644
index 0000000..0360a54
--- /dev/null
+++ b/tests/AnagraficaTest.php
@@ -0,0 +1,23 @@
+<?php
+
+namespace Axiostudio\FatturaElettronica\Tests;
+
+use Axiostudio\FatturaElettronica\Models\Anagrafica;
+use PHPUnit\Framework\TestCase;
+
+class AnagraficaTest extends TestCase
+{
+    public function testConstructor(): void
+    {
+        $denominazione = 'Company';
+        $nome = 'John';
+        $cognome = 'Doe';
+
+        $anagrafica = new Anagrafica($denominazione, $nome, $cognome);
+
+        $this->assertInstanceOf(Anagrafica::class, $anagrafica);
+        $this->assertEquals($denominazione, $anagrafica->Denominazione);
+        $this->assertEquals($nome, $anagrafica->Nome);
+        $this->assertEquals($cognome, $anagrafica->Cognome);
+    }
+}
diff --git a/tests/TestCase.php b/tests/TestCase.php
new file mode 100644
index 0000000..9669a5c
--- /dev/null
+++ b/tests/TestCase.php
@@ -0,0 +1,8 @@
+<?php
+
+use PHPUnit\Framework\TestCase as BaseTestCase;
+
+abstract class TestCase extends BaseTestCase
+{
+    //
+}