[ticket/12620] Add a test using a custom DI extension in an extension

PHPBB3-12620

tests/di/fixtures/ext/vendor/enabled_4/di/extension.php

@@ -0,0 +1,31 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace vendor\enabled_4\di;
+
+use phpbb\extension\di\extension_base;
+use Symfony\Component\Config\FileLocator;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
+
+/**
+* Container core extension
+*/
+class extension extends extension_base
+{
+	protected function load_services(ContainerBuilder $container)
+	{
+		$loader = new YamlFileLoader($container, new FileLocator(phpbb_realpath($this->ext_path)));
+		$loader->load('environment.yml');
+	}
+}

tests/di/fixtures/ext/vendor/enabled_4/environment.yml

@@ -0,0 +1,2 @@
+parameters:
+    enabled_4: true