@Test
public void testToString() {

    DayClustering cl0 = DayClustering.create(new int[]{1,1,1,1,1,0,0});
    DayClustering cl1 = DayClustering.create(new int[]{1,1,1,1,1,2,0});
    DayClustering cl2 = DayClustering.create(new int[]{1,2,3,4,5,6,0});
    assertTrue(cl0.toString().equalsIgnoreCase("td2"));
    assertTrue(cl1.toString().equalsIgnoreCase("td3"));
    assertTrue(cl2.toString().equalsIgnoreCase("td7"));
}