   @Test
   public void testCompare() {

      System.out.println("compare");
      String s1 = "i";
      String s2 = "I";
      int expResult = 0;
      int result = NaturalOrder.compareStrings(s1, s2);
      assertEquals(expResult, result);

      s1 = "ISAAC metadata (ISAAC)";
      s2 = "health concept";
      result = NaturalOrder.compareStrings(s1, s2);      
      assertTrue(result > 0);
      
      s1 = "1";
      s2 = "10";
      result = NaturalOrder.compareStrings(s1, s2);      
      assertTrue(result < 0);

      s1 = "2";
      s2 = "10";
      result = NaturalOrder.compareStrings(s1, s2);      
      assertTrue(result < 0);
      
   }