public void CalculateTimeToRunInMonths() { //arrange Scheduler.Scheduler scheduler = new Scheduler.Scheduler(); DateTime currentDateTime = new DateTime(2018, 06, 11, 21, 30, 00); DateTime expectedDateTime = new DateTime(2018, 08, 11, 21, 30, 00); int interval = 2; //act var actualDateTime = scheduler.CalculateTimeToRunInMonths(interval, currentDateTime); //assert Assert.AreEqual(expectedDateTime, actualDateTime); }