public void DifferenceInMintuesTest()
{
var ds1 = new DateSpan(2017, 1, 1, 11, 0, 0, 0);
var ds2 = new DateSpan(2017, 1, 1, 12, 0, 0, 0);
var difference = ds1.DifferenceInMinutes(ds2);
Assert.AreEqual(-60d, difference);
difference = ds2.DifferenceInMinutes(ds1);
Assert.AreEqual(60d, difference);
difference = ds1.DifferenceInMinutes(ds1);
Assert.AreEqual(0d, difference);
}
