@Test(expected=UnsupportedEncodingException.class) public void copyByteArrayValidWriterJunkEncoding() throws Exception {
  String probe="A string \u2345\u00ef";
  StringWriter writer=new DontCloseStringWriter();
  IOUtil.copy(probe.getBytes(),writer,"junk");
  assertThat(writer.toString().getBytes(),is(probe.getBytes()));
}