@Test
public void testContainsInt() throws Exception {

    assertFalse(rbll.containsInt(4));
    rbll.addInterval(0, 2);
    assertFalse(rbll.containsInt(4));
    assertTrue(rbll.containsInt(0));
    assertTrue(rbll.containsInt(1));
    assertTrue(rbll.containsInt(2));
}