public void Equals_DifferentCalendars()
{
CalendarSystem calendar = CalendarSystem.Julian;
YearMonth yearMonth1 = new YearMonth(2011, 1, calendar);
YearMonth yearMonth2 = new YearMonth(2011, 1, CalendarSystem.Iso);
Assert.AreNotEqual(yearMonth1, yearMonth2);
Assert.AreNotEqual(yearMonth1.GetHashCode(), yearMonth2.GetHashCode());
Assert.IsFalse(yearMonth1 == yearMonth2);
Assert.IsTrue(yearMonth1 != yearMonth2);
Assert.IsFalse(yearMonth1.Equals(yearMonth2)); // IEquatable implementation
}