public function testFileKey()
{
$fileId = 123;
$ownerEntityClass = 'Acme\\MyClass';
$ownerEntityId = 456;
$key = $this->attachmentManager->buildFileKey($fileId, $ownerEntityClass, $ownerEntityId);
$this->assertNotEmpty($key);
$this->assertTrue(is_string($key));
list($extractedFileId, $extractedOwnerEntityClass, $extractedOwnerEntityId) = $this->attachmentManager->parseFileKey($key);
$this->assertSame($fileId, $extractedFileId);
$this->assertSame($ownerEntityClass, $extractedOwnerEntityClass);
$this->assertSame($ownerEntityId, $extractedOwnerEntityId);
}
