Validate root_namespace configuration

src/MakerBundle.php

@@ -32,7 +32,13 @@ class MakerBundle extends AbstractBundle
     {
         $definition->rootNode()
             ->children()
-                ->scalarNode('root_namespace')->defaultValue('App')->end()
+                ->scalarNode('root_namespace')
+                    ->defaultValue('App')
+                    ->validate()
+                        ->ifString()
+                        ->then(Validator::validateClassName(...))
+                    ->end()
+                ->end()
                 ->booleanNode('generate_final_classes')->defaultTrue()->end()
                 ->booleanNode('generate_final_entities')->defaultFalse()->end()
             ->end()

tests/BundleConfigurationTest.php

@@ -0,0 +1,84 @@
+<?php
+
+/*
+ * This file is part of the Symfony MakerBundle package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Bundle\MakerBundle\Tests;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Bundle\MakerBundle\MakerBundle;
+use Symfony\Component\Config\Definition\Builder\TreeBuilder;
+use Symfony\Component\Config\Definition\Configurator\DefinitionConfigurator;
+use Symfony\Component\Config\Definition\Exception\InvalidConfigurationException;
+use Symfony\Component\Config\Definition\Loader\DefinitionFileLoader;
+use Symfony\Component\Config\Definition\Processor;
+
+class BundleConfigurationTest extends TestCase
+{
+    public function testDefaultConfiguration()
+    {
+        $config = $this->processConfiguration([]);
+
+        $this->assertSame('App', $config['root_namespace']);
+        $this->assertTrue($config['generate_final_classes']);
+        $this->assertFalse($config['generate_final_entities']);
+    }
+
+    public function testAllOptionsConfigured()
+    {
+        $config = $this->processConfiguration([
+            'maker' => [
+                'root_namespace' => 'Custom\\Name\\Space',
+                'generate_final_classes' => false,
+                'generate_final_entities' => true,
+            ],
+        ]);
+
+        $this->assertSame('Custom\\Name\\Space', $config['root_namespace']);
+        $this->assertFalse($config['generate_final_classes']);
+        $this->assertTrue($config['generate_final_entities']);
+    }
+
+    public function testInvalidRootNamespaceWithReservedKeyword()
+    {
+        $this->expectException(InvalidConfigurationException::class);
+        $this->expectExceptionMessage('"Class" is a reserved keyword');
+
+        $this->processConfiguration([
+            'maker' => [
+                'root_namespace' => 'App\\Class',
+            ],
+        ]);
+    }
+
+    /**
+     * Processes the configuration using the MakerBundle's configure method.
+     *
+     * @param array<string, mixed> $configs
+     *
+     * @return array<string, mixed>
+     */
+    private function processConfiguration(array $configs): array
+    {
+        $bundle = new MakerBundle();
+        $treeBuilder = new TreeBuilder('maker');
+        $definitionConfigurator = new DefinitionConfigurator(
+            $treeBuilder,
+            $this->createStub(DefinitionFileLoader::class),
+            __DIR__,
+            __FILE__
+        );
+
+        $bundle->configure($definitionConfigurator);
+
+        $processor = new Processor();
+
+        return $processor->process($treeBuilder->buildTree(), $configs);
+    }
+}