@Test
public void testCotains() {

  Assert.assertTrue(CharSequences.containsIgnoreCase("asdgafsdHgas", ""));
  Assert.assertTrue(CharSequences.containsIgnoreCase("asdgafsdHgas", "sdh"));
  Assert.assertFalse(CharSequences.containsIgnoreCase("asdgafsdHgas", "sdhf"));
}