Add PHPUnit test bootstrap to silence exception-handler risky warnings

Register Symfony's `ErrorHandler` in `tests/bootstrap.php` and point `phpunit.xml.dist`
at it, removing the "did not remove its own exception handlers" risky warnings on
PHP 8.4/8.5. Add `symfony/error-handler` to require-dev so the bootstrap no longer
relies on a transitive dependency.

Author: endelwar

composer.json

@@ -47,6 +47,7 @@
         "symfony/css-selector": "^5.4 || ^6.0 || ^7.0 || ^8.0",
         "symfony/doctrine-bridge": "^5.4 || ^6.0 || ^7.0 || ^8.0",
         "symfony/dom-crawler": "^5.4 || ^6.0 || ^7.0 || ^8.0",
+        "symfony/error-handler": "^5.4 || ^6.0 || ^7.0 || ^8.0",
         "symfony/form": "^5.4 || ^6.0 || ^7.0 || ^8.0",
         "symfony/framework-bundle": "^5.4 || ^6.0 || ^7.0 || ^8.0",
         "symfony/phpunit-bridge": "^7.3",

phpunit.xml.dist

@@ -2,7 +2,7 @@
 
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="vendor/phpunit/phpunit/phpunit.xsd"
-         bootstrap="vendor/autoload.php"
+         bootstrap="tests/bootstrap.php"
          colors="true">
     <testsuites>
         <testsuite name="VichUploaderBundle Test Suite">

tests/bootstrap.php

@@ -0,0 +1,8 @@
+<?php
+
+use Symfony\Component\ErrorHandler\ErrorHandler;
+
+require \dirname(__DIR__).'/vendor/autoload.php';
+
+// see https://github.com/symfony/symfony/issues/53812#issuecomment-1962740145
+\set_exception_handler([new ErrorHandler(), 'handleException']);