public static IEnumerable<object[]> AddMonths_TestData()
{
yield return new object[] { new DateTimeOffset(new DateTime(1986, 8, 15, 10, 20, 5, 70, DateTimeKind.Utc)), 2, new DateTimeOffset(new DateTime(1986, 10, 15, 10, 20, 5, 70, DateTimeKind.Utc)) };
yield return new object[] { new DateTimeOffset(new DateTime(1986, 8, 15, 10, 20, 5, 70, DateTimeKind.Utc)), 0, new DateTimeOffset(new DateTime(1986, 8, 15, 10, 20, 5, 70, DateTimeKind.Utc)) };
yield return new object[] { new DateTimeOffset(new DateTime(1986, 8, 15, 10, 20, 5, 70, DateTimeKind.Utc)), -2, new DateTimeOffset(new DateTime(1986, 6, 15, 10, 20, 5, 70, DateTimeKind.Utc)) };
}