@Test
public void testShort() {

    EasterVariable var = new EasterVariable();
    DataBlock x = new DataBlock(12), y = new DataBlock(12);
    TsPeriod start = new TsPeriod(TsFrequency.Monthly, 1980, 0);
    var.data(start, x);
    for (int i = 0; i < 12; ++i) {
        DataBlock yc = y.range(i, i+1);
        var.data(start, yc);
        start.move(1);
    }
    assertTrue(x.distance(y)==0);
}