public virtual void test_isRegular_null()
{
SchedulePeriod test = SchedulePeriod.of(JUN_16, JUL_18);
assertThrowsIllegalArg(() => test.isRegular(null, DAY_18));
assertThrowsIllegalArg(() => test.isRegular(P1M, null));
assertThrowsIllegalArg(() => test.isRegular(null, null));
}
