assertNotNull(tokens);
        assertEquals(3, tokens.size());
        assertEquals(0, tokens.get(0).getStartOffset());
        assertEquals(3, tokens.get(0).getEndOffset());
        assertEquals(4, tokens.get(1).getStartOffset());
        assertEquals(7, tokens.get(1).getEndOffset());
        assertEquals(8, tokens.get(2).getStartOffset());
        assertEquals(13, tokens.get(2).getEndOffset());
    }

    @Test