The interval for a repeat-harvest that has been rounded up to the next multiple of the harvest timestep.
        //---------------------------------------------------------------------

        private void AssertAreEqual(BaseHarvest.RoundedInterval expected,
                                    BaseHarvest.RoundedInterval actual)
        {
            Assert.AreEqual(expected.Original, actual.Original);
            Assert.AreEqual(expected.Adjusted, actual.Adjusted);
            Assert.AreEqual(expected.LineNumber, actual.LineNumber);
        }
 //---------------------------------------------------------------------
 private void AssertAreEqual(RoundedInterval expected,
                             RoundedInterval actual)
 {
     Assert.AreEqual(expected.Original, actual.Original);
     Assert.AreEqual(expected.Adjusted, actual.Adjusted);
     Assert.AreEqual(expected.LineNumber, actual.LineNumber);
 }