@Test(expectedExceptions = NullPointerException.class)
public void testWithMonthOfYearInvalidNull() throws Exception {
testDate.withMonthOfYear(null);
}
// -----------------------------------------------------------------------
// withMonthOfYear()
// -----------------------------------------------------------------------
@Test
public void testWithMonthOfYear() {
MinguoDate date = testDate.withMonthOfYear(MonthOfYear.APRIL);
assertEquals(date, MinguoDate.of(testYear, MonthOfYear.APRIL, testDayOfMonth));
}