@Test
public void verifyShiftPeriod()
{

    Period p1 = PeriodOffsetUtils.shiftPeriod( createMonthlyPeriod( 2020, 1 ), 12 );
    assertThat( p1.getIsoDate(), is( "202101" ) );
    Period p2 = PeriodOffsetUtils.shiftPeriod( createQuarterPeriod( 2020, 1 ), 12 );
    assertThat( p2.getIsoDate(), is( "2023Q1" ) );
    Period p3 = PeriodOffsetUtils.shiftPeriod( createWeeklyType( 2020, 5, 1 ), 2 );
    assertThat( p3.getIsoDate(), is( "2020W20" ) );
}