public void TestExtractFromPartitionKey()
{
const string city = "city";
const string date = "2015-05-21";
string partitionKey = string.Format("{0};{1}", city, date);
Tuple <string, DateTime> values = NewsEntity.ExtractFromPartitionKey(partitionKey);
Assert.AreEqual(city, values.Item1);
Assert.AreEqual(DateTime.Parse(date), values.Item2);
}