chore: add test bootstrap, update phpunit config, and add Laravel 13 support to README

- Add tests/bootstrap.php to suppress PHP 8.4 vendor deprecation notices (Mockery implicit-nullable)
- Update phpunit.xml.dist to reference bootstrap, use PHPUnit 11.5 schema, and ignore indirect deprecations
- Note Laravel 13 support in README

README.md

@@ -9,11 +9,12 @@
 
 A Cart Implementation for Laravel.
 
-Supported Laravel Versions: 10, 11, and 12.
+Supported Laravel Versions: 10, 11, 12, and 13.
 
 For Laravel 9.0 and below, please use version [1.0](https://github.com/wearepixel/laravel-cart/releases/tag/1.0.12)
 
 ## Table of Contents
+
 - [Getting Started](#-getting-started)
 - [Demo](#-deni)
 - [Documentation](#-documentation)
@@ -27,6 +28,7 @@ ## Table of Contents
 - [License](#-license)
 
 ## 🚀 Getting Started
+
 ### 🔥 Installing
 
 Install the package through [Composer](http://getcomposer.org/).
@@ -107,7 +109,6 @@ #### Round Mode
 'round_mode' => env('LARAVEL_CART_ROUND_MODE', 'down'),
 ```
 
-
 ### Basic Usage
 
 The cart has a default sessionKey that holds the cart data and stores it in the session, so you can have multiple carts for multiple users.

phpunit.xml.dist

@@ -1,15 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         bootstrap="vendor/autoload.php"
-         colors="true"
-         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.4/phpunit.xsd"
->
-<source>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" bootstrap="tests/bootstrap.php" colors="true" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/11.5/phpunit.xsd">
+  <source ignoreIndirectDeprecations="true">
     <include>
       <directory suffix=".php">./src</directory>
     </include>
   </source>
-    <testsuites>
+  <testsuites>
     <testsuite name="Laravel Cart Test Suite">
       <directory>tests</directory>
     </testsuite>

tests/bootstrap.php

@@ -0,0 +1,14 @@
+<?php
+
+require __DIR__ . '/../vendor/autoload.php';
+
+// Suppress PHP 8.4 deprecation notices that originate from vendor code.
+// These are typically from third-party packages (e.g. Mockery) that have not
+// yet updated implicit-nullable parameter signatures and are not actionable here.
+set_error_handler(static function (int $errno, string $errstr, string $errfile): bool {
+    if ($errno === E_DEPRECATED && str_contains($errfile, DIRECTORY_SEPARATOR . 'vendor' . DIRECTORY_SEPARATOR)) {
+        return true;
+    }
+
+    return false;
+}, E_DEPRECATED);