@Test
public void testLocateForLessThan() {

    assertEquals(all,  test.locateForLessThan(exp(M, 0)));
    assertEquals(all,  test.locateForLessThan(exp(M, 1)));
    assertEquals(all,  test.locateForLessThan(exp(M, 2)));
    assertEquals(all,  test.locateForLessThan(exp(M, 3)));
    assertEquals(all,  test.locateForLessThan(exp(M, 4)));
}