source: class RBLLTest {
  
       RBLL rbll;
  
      @Test
      public void testContainsInt() throws Exception {
  
target:         assertFalse(rbll.containsInt(4));
          rbll.addInterval(0, 2);
          assertFalse(rbll.containsInt(4));
          assertTrue(rbll.containsInt(0));
          assertTrue(rbll.containsInt(1));
          assertTrue(rbll.containsInt(2));
      }
  
  }