@Test
public void io_chars() throws IOException {

    test(new CB() {
        public void run(boolean close) throws IOException {
            SR in = new SR(chars);
            SW out = new SW();
            StreamUtil.io(in, out, close, close);
            assertEquals(chars, out.toString());
            in.assertClosed(close);
            out.assertClosed(close);
        }
    });
}