public void LocalComparer()
{
var localControl = new LocalDateTime(2013, 4, 2, 19, 54);
var control = new OffsetDateTime(localControl, Offset.Zero);
var negativeOffset = control.LocalDateTime.WithOffset(Offset.FromHours(-1));
var positiveOffset = control.LocalDateTime.WithOffset(Offset.FromHours(1));
var differentCalendar = control.LocalDateTime.WithCalendar(CalendarSystem.Coptic).WithOffset(Offset.FromHours(5));
// Later instant, earlier local
var earlierLocal = control.LocalDateTime.PlusHours(-2).WithOffset(Offset.FromHours(-10));
// Same offset, previous day
var muchEarlierLocal = control.PlusHours(-24);
// Earlier instant, later local
var laterLocal = control.LocalDateTime.PlusHours(2).WithOffset(Offset.FromHours(10));
// Same offset, next day
var muchLaterLocal = control.PlusHours(24);
var comparer = OffsetDateTime.Comparer.Local;
Assert.AreEqual(0, comparer.Compare(control, negativeOffset));
Assert.AreEqual(0, comparer.Compare(control, positiveOffset));
Assert.Throws <ArgumentException>(() => comparer.Compare(control, differentCalendar));
Assert.AreEqual(1, Math.Sign(comparer.Compare(control, earlierLocal)));
Assert.AreEqual(1, Math.Sign(comparer.Compare(control, muchEarlierLocal)));
Assert.AreEqual(-1, Math.Sign(comparer.Compare(earlierLocal, control)));
Assert.AreEqual(-1, Math.Sign(comparer.Compare(muchEarlierLocal, control)));
Assert.AreEqual(-1, Math.Sign(comparer.Compare(control, laterLocal)));
Assert.AreEqual(-1, Math.Sign(comparer.Compare(control, muchLaterLocal)));
Assert.AreEqual(1, Math.Sign(comparer.Compare(laterLocal, control)));
Assert.AreEqual(1, Math.Sign(comparer.Compare(muchLaterLocal, control)));
Assert.IsFalse(comparer.Equals(control, differentCalendar));
Assert.IsFalse(comparer.Equals(control, earlierLocal));
Assert.IsFalse(comparer.Equals(control, muchEarlierLocal));
Assert.IsFalse(comparer.Equals(control, laterLocal));
Assert.IsFalse(comparer.Equals(control, muchLaterLocal));
Assert.IsTrue(comparer.Equals(control, control));
Assert.AreEqual(comparer.GetHashCode(control), comparer.GetHashCode(negativeOffset));
Assert.AreEqual(comparer.GetHashCode(control), comparer.GetHashCode(positiveOffset));
Assert.AreNotEqual(comparer.GetHashCode(control), comparer.GetHashCode(earlierLocal));
Assert.AreNotEqual(comparer.GetHashCode(control), comparer.GetHashCode(muchEarlierLocal));
Assert.AreNotEqual(comparer.GetHashCode(control), comparer.GetHashCode(laterLocal));
Assert.AreNotEqual(comparer.GetHashCode(control), comparer.GetHashCode(muchLaterLocal));
Assert.AreNotEqual(comparer.GetHashCode(control), comparer.GetHashCode(differentCalendar));
}