public static IEnumerable<object[]> AddMinutes_TestData()
{
yield return new object[] { new DateTime(1986, 8, 15, 10, 20, 5, 70), 5, new DateTime(1986, 8, 15, 10, 25, 5, 70) };
yield return new object[] { new DateTime(1986, 8, 15, 10, 20, 5, 70), 0, new DateTime(1986, 8, 15, 10, 20, 5, 70) };
yield return new object[] { new DateTime(1986, 8, 15, 10, 20, 5, 70), -5, new DateTime(1986, 8, 15, 10, 15, 5, 70) };
}