@Before
    public void setUp() {
        this._instance = new ChristmasDay();
        this._years = new LinkedList<Integer>();
        for (int year = 1974; year < 2021; year++)
            this._years.add(year);
        this._ChristmasDayUnitedKingdoms = new HashMap<Integer, GregorianCalendar>();
        for (int year : this._years) {
            GregorianCalendar ChristmasDayUnitedKingdom = new GregorianCalendar(year, 11, 25);
            switch (year){
                case 1976:
                case 1982:
                case 1993:
                case 1999:
                case 2004:
                case 2010:
                    ChristmasDayUnitedKingdom.add(GregorianCalendar.DATE, 2);
            }
            this._ChristmasDayUnitedKingdoms.put(year, ChristmasDayUnitedKingdom);
        }
    }