public void Count()
{
_driver.GetRandomName().Returns(TestFileName);
_driver.Write(Arg.Any <string>()).Returns(x => new MemoryStream());
var storage = new XmlStorage(_driver, new XmlStorageIndex(_driver));
Assert.DoesNotThrow(() => storage.Count());
Assert.AreEqual(0, storage.Count());
storage.Write(_info, _info.Url);
Assert.AreEqual(1, storage.Count());
}