public function testToStorageValue()
{
$value = new FieldValue();
$value->data = $this->time;
$value->sortKey = $this->time;
$storageFieldValue = new StorageFieldValue();
$this->converter->toStorageValue($value, $storageFieldValue);
self::assertSame($value->data, $storageFieldValue->dataInt);
self::assertSame($value->sortKey, $storageFieldValue->sortKeyInt);
self::assertSame('', $storageFieldValue->sortKeyString);
}