public void GetLeapMonth()
{
GregorianCalendar gc = new GregorianCalendar();
Assert.AreEqual(0, gc.GetLeapMonth(2007), "#1-1");
Assert.AreEqual(0, gc.GetLeapMonth(2008), "#1-2");
Assert.AreEqual(0, gc.GetLeapMonth(2100), "#1-3");
Assert.AreEqual(0, gc.GetLeapMonth(2000), "#1-4");
JulianCalendar jc = new JulianCalendar();
Assert.AreEqual(0, jc.GetLeapMonth(2007), "#2-1");
Assert.AreEqual(0, jc.GetLeapMonth(2008), "#2-2");
Assert.AreEqual(0, jc.GetLeapMonth(2100), "#2-3");
Assert.AreEqual(0, jc.GetLeapMonth(2000), "#2-4");
Assert.AreEqual(0, jc.GetLeapMonth(2009), "#2-5");
Assert.AreEqual(0, jc.GetLeapMonth(2010), "#2-6");
HebrewCalendar hc = new HebrewCalendar();
// 3rd, 6th, 8th, 11th 14th and 17th year in every 19 are leap.
// 5339 % 19 = 0.
Assert.AreEqual(0, hc.GetLeapMonth(5343), "#3-1");
Assert.AreEqual(0, hc.GetLeapMonth(5344), "#3-2");
Assert.AreEqual(7, hc.GetLeapMonth(5345), "#3-3");
Assert.AreEqual(0, hc.GetLeapMonth(5346), "#3-4");
Assert.AreEqual(7, hc.GetLeapMonth(5347), "#3-5");
Assert.AreEqual(0, hc.GetLeapMonth(5348), "#3-6");
Assert.AreEqual(0, hc.GetLeapMonth(5349), "#3-7");
ThaiBuddhistCalendar tc = new ThaiBuddhistCalendar();
Assert.AreEqual(0, tc.GetLeapMonth(2520), "#4-1");
Assert.AreEqual(0, tc.GetLeapMonth(2521), "#4-2");
Assert.AreEqual(0, tc.GetLeapMonth(2522), "#4-3");
Assert.AreEqual(0, tc.GetLeapMonth(2523), "#4-4");
ChineseLunisolarCalendar cc = new ChineseLunisolarCalendar();
Assert.AreEqual(0, cc.GetLeapMonth(2000), "#5-1");
Assert.AreEqual(5, cc.GetLeapMonth(2001), "#5-2");
Assert.AreEqual(0, cc.GetLeapMonth(2002), "#5-3");
Assert.AreEqual(0, cc.GetLeapMonth(2003), "#5-4");
Assert.AreEqual(3, cc.GetLeapMonth(2004), "#5-5");
Assert.AreEqual(0, cc.GetLeapMonth(2005), "#5-6");
Assert.AreEqual(8, cc.GetLeapMonth(2006), "#5-7");
Assert.AreEqual(0, cc.GetLeapMonth(2007), "#5-8");
Assert.AreEqual(0, cc.GetLeapMonth(2008), "#5-9");
Assert.AreEqual(6, cc.GetLeapMonth(2009), "#5-10");
Assert.AreEqual(0, cc.GetLeapMonth(2010), "#5-11");
Assert.AreEqual(0, cc.GetLeapMonth(2011), "#5-12");
Assert.AreEqual(5, cc.GetLeapMonth(2012), "#5-13");
Assert.AreEqual(0, cc.GetLeapMonth(2013), "#5-14");
Assert.AreEqual(10, cc.GetLeapMonth(2014), "#5-15");
Assert.AreEqual(0, cc.GetLeapMonth(2015), "#5-16");
Assert.AreEqual(0, cc.GetLeapMonth(2016), "#5-17");
Assert.AreEqual(7, cc.GetLeapMonth(2017), "#5-18");
Assert.AreEqual(0, cc.GetLeapMonth(2018), "#5-19");
Assert.AreEqual(0, cc.GetLeapMonth(2019), "#5-20");
KoreanLunisolarCalendar kc = new KoreanLunisolarCalendar();
Assert.AreEqual(0, kc.GetLeapMonth(2000), "#6-1");
Assert.AreEqual(5, kc.GetLeapMonth(2001), "#6-2");
Assert.AreEqual(0, kc.GetLeapMonth(2002), "#6-3");
Assert.AreEqual(0, kc.GetLeapMonth(2003), "#6-4");
Assert.AreEqual(3, kc.GetLeapMonth(2004), "#6-5");
Assert.AreEqual(0, kc.GetLeapMonth(2005), "#6-6");
Assert.AreEqual(8, kc.GetLeapMonth(2006), "#6-7");
Assert.AreEqual(0, kc.GetLeapMonth(2007), "#6-8");
Assert.AreEqual(0, kc.GetLeapMonth(2008), "#6-9");
Assert.AreEqual(6, kc.GetLeapMonth(2009), "#6-10");
Assert.AreEqual(0, kc.GetLeapMonth(2010), "#6-11");
Assert.AreEqual(0, kc.GetLeapMonth(2011), "#6-12");
Assert.AreEqual(4, kc.GetLeapMonth(2012)); // off from cn by 1, "#6-13");
Assert.AreEqual(0, kc.GetLeapMonth(2013), "#6-14");
Assert.AreEqual(10, kc.GetLeapMonth(2014), "#6-15");
Assert.AreEqual(0, kc.GetLeapMonth(2015), "#6-16");
Assert.AreEqual(0, kc.GetLeapMonth(2016), "#6-17");
Assert.AreEqual(6, kc.GetLeapMonth(2017)); // off from cn by 1, "#6-18");
Assert.AreEqual(0, kc.GetLeapMonth(2018), "#6-19");
Assert.AreEqual(0, kc.GetLeapMonth(2019), "#6-20");
}