public void WriteData()
{
var storage = new XmlStorage(_driver, _index);
Assert.Throws <ArgumentNullException>(() => storage.Write <DataInfo>(null, "as"));
Assert.Throws <ArgumentException>(() => storage.Write <DataInfo>(_info, ""));
_driver.GetRandomName().Returns(TestFileName);
_driver.Write(Arg.Any <string>()).Returns(x => new MemoryStream());
Assert.DoesNotThrow(() => storage.Write(_info, _info.Url));
_driver.Received(1).Write(Arg.Is(TestFileName));
_index.Received(1).Add(Arg.Any <StorageItem>());
}
