public function testToStorageValue()
{
$value = new FieldValue();
$value->data = array('timestamp' => $this->date->getTimestamp(), 'rfc850' => $this->date->format(\DateTime::RFC850));
$value->sortKey = $this->date->getTimestamp();
$storageFieldValue = new StorageFieldValue();
$this->converter->toStorageValue($value, $storageFieldValue);
self::assertSame($value->data['timestamp'], $storageFieldValue->dataInt);
self::assertSame($value->sortKey, $storageFieldValue->sortKeyInt);
self::assertSame('', $storageFieldValue->sortKeyString);
}