diff --git a/cookbook/form/unit_testing.rst b/cookbook/form/unit_testing.rst
index 8522f39efa9..9e0d84b2b63 100644
--- a/cookbook/form/unit_testing.rst
+++ b/cookbook/form/unit_testing.rst
@@ -117,7 +117,7 @@ might look like this::
To create your form correctly, you need to make the type available to the
form factory in your test. The easiest way is to register it manually
-before creating the parent form::
+before creating the parent form using PreloadedExtension class::
// src/Acme/TestBundle/Tests/Form/Type/TestedTypeTests.php
namespace Acme\TestBundle\Tests\Form\Type;
@@ -125,13 +125,20 @@ before creating the parent form::
use Acme\TestBundle\Form\Type\TestedType;
use Acme\TestBundle\Model\TestObject;
use Symfony\Component\Form\Test\TypeTestCase;
+ use Symfony\Component\Form\PreloadedExtension;
class TestedTypeTest extends TypeTestCase
{
- public function testSubmitValidData()
+ protected function getExtensions()
{
- $this->factory->addType(new TestChildType());
+ $childType = new TestChildType();
+ return array(new PreloadedExtension(array(
+ $childType->getName() => $childType,
+ ), array()));
+ }
+ public function testSubmitValidData()
+ {
$type = new TestedType();
$form = $this->factory->create($type);
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