public function testFolderGetterAndSetter()
 {
     $folder = $this->getMock('Oro\\Bundle\\EmailBundle\\Entity\\EmailFolder');
     $entity = new TestEmailOrigin();
     $entity->addFolder($folder);
     $folders = $entity->getFolders();
     $this->assertInstanceOf('Doctrine\\Common\\Collections\\ArrayCollection', $folders);
     $this->assertCount(1, $folders);
     $this->assertTrue($folder === $folders[0]);
 }