public function testGetRootCode()
{
$admin = new PostAdmin('sonata.post.admin.post', 'NewsBundle\\Entity\\Post', 'SonataNewsBundle:PostAdmin');
$this->assertSame('sonata.post.admin.post', $admin->getRootCode());
$parentAdmin = new PostAdmin('sonata.post.admin.post.parent', 'NewsBundle\\Entity\\PostParent', 'SonataNewsBundle:PostParentAdmin');
$parentFieldDescription = $this->getMock('Sonata\\AdminBundle\\Admin\\FieldDescriptionInterface');
$parentFieldDescription->expects($this->once())->method('getAdmin')->will($this->returnValue($parentAdmin));
$this->assertNull($admin->getParentFieldDescription());
$admin->setParentFieldDescription($parentFieldDescription);
$this->assertSame($parentFieldDescription, $admin->getParentFieldDescription());
$this->assertSame('sonata.post.admin.post.parent', $admin->getRootCode());
}