public void testOccupationMatrix() {
        List<int[]> r;
        int bs = 3;
        int np = 1;
        for (int b = bs; b < 6; b++) {
            for (int n = np; n < 5; n++) {
                r = decisiontrees.DecisionTreesBuilderHelper.createOccupationMatrixList(b, n);
                assertFalse(r.isEmpty());
                assertEquals(org.apache.commons.math3.util.CombinatoricsUtils.binomialCoefficient(b * b, n), r.size());
            }
        }
    }