@Test
public void testLongTermCorrection() {

    double w = .88;
    EasterRelatedDay day = new EasterRelatedDay(-39, w);
    double[][] le = day.getLongTermMeanEffect(12);
    double p = 0;
    for (int i = 0; i < 6; ++i) {
        for (int j = 0; j < le.length; ++j) {
            if (le[j] != null) {
                p += le[j][i];
            }
        }
    }
    org.junit.Assert.assertTrue(Math.abs(p - w) < 1e-9);
}