public void TestGetWriteConcern_WTimeout(int? ms, string connectionString)
{
var wtimeout = (ms == null) ? (TimeSpan?)null : TimeSpan.FromMilliseconds(ms.Value);
var url = new MongoUrl(connectionString);
var writeConcern = url.GetWriteConcern(true);
Assert.AreEqual(wtimeout, writeConcern.WTimeout);
}