StringCharacterIterator it1 =
new StringCharacterIterator("testing", 2, 6, 4);
assertEquals("Wrong previous char1", 't', it1.previous());
assertEquals("Wrong previous char2", 's', it1.previous());
assertTrue("Wrong previous char3",
it1.previous() == CharacterIterator.DONE);
assertTrue("Wrong previous char4",
it1.previous() == CharacterIterator.DONE);
assertEquals("Wrong index", 2, it1.getIndex());
assertEquals("Wrong current char", 's', it1.current());
}