@Test
 public void testLevenshtein() {
   Assert.assertEquals(2, StringDistance.levenshtein("GUMBO", "GAMBOL"));
   Assert.assertEquals(6, StringDistance.levenshtein("", "GAMBOL"));
   Assert.assertEquals(3, StringDistance.levenshtein("Windows", "XP Windows"));
   Assert.assertEquals(3, StringDistance.levenshtein("XP Windows", "Windows"));
   Assert.assertEquals(0, StringDistance.levenshtein("Windows", "Windows"));
 }