}
// basic sanity check that the conversion algorithm round-trips
public void TestCopticToJD() {
CopticCalendar cal = new CopticCalendar();
cal.clear();
for (int y = -2; y < 3; ++y) {
for (int m = 0; m < 12; ++m) { // don't understand rules for 13th month
for (int d = 1; d < 25; d += 3) { // play it safe on days per month
int jd = CopticCalendar.copticToJD(y, m, d);
cal.set(Calendar.JULIAN_DAY, jd);