Factory used to create a new entity manager

tests/Doctrine/Performance/EntityManagerFactory.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace Doctrine\Performance;
+
+use Doctrine\DBAL\Driver\PDOSqlite\Driver;
+use Doctrine\ORM\Configuration;
+use Doctrine\ORM\EntityManager;
+use Doctrine\ORM\EntityManagerInterface;
+use Doctrine\ORM\Proxy\ProxyFactory;
+use Doctrine\ORM\Tools\SchemaTool;
+
+final class EntityManagerFactory
+{
+    public static function getEntityManager(array $schemaClassNames) : EntityManagerInterface
+    {
+        $config = new Configuration();
+
+        $config->setProxyDir(__DIR__ . '/../Tests/Proxies');
+        $config->setProxyNamespace('Doctrine\Tests\Proxies');
+        $config->setAutoGenerateProxyClasses(ProxyFactory::AUTOGENERATE_EVAL);
+        $config->setMetadataDriverImpl($config->newDefaultAnnotationDriver([
+            realpath(__DIR__ . '/Models/Cache'),
+            realpath(__DIR__ . '/Models/GeoNames')
+        ], true));
+
+        $entityManager = EntityManager::create(
+            [
+                'driverClass' => Driver::class,
+                'memory'      => true,
+            ],
+            $config
+        );
+
+        (new SchemaTool($entityManager))
+            ->createSchema(array_map([$entityManager, 'getClassMetadata'], $schemaClassNames));
+
+        return $entityManager;
+    }
+}