public static IEnumerable<object[]> AddTicks_TestData()
{
yield return new object[] { new DateTimeOffset(new DateTime(1000, DateTimeKind.Utc)), 10, new DateTimeOffset(new DateTime(1010, DateTimeKind.Utc)) };
yield return new object[] { new DateTimeOffset(new DateTime(1000, DateTimeKind.Utc)), 0, new DateTimeOffset(new DateTime(1000, DateTimeKind.Utc)) };
yield return new object[] { new DateTimeOffset(new DateTime(1000, DateTimeKind.Utc)), -10, new DateTimeOffset(new DateTime(990, DateTimeKind.Utc)) };
}