@Test
public void testReduceOutOfDiskSpace() throws Throwable {

  LOG.info("testReduceOutOfDiskSpace");
  
  Fetcher<Text,Text> underTest = new FakeFetcher<Text,Text>(job, id, ss, mm,
      r, metrics, except, key, connection);
  String replyHash = SecureShuffleUtils.generateHash(encHash.getBytes(), key);
  ShuffleHeader header = new ShuffleHeader(map1ID.toString(), 10, 10, 1);
  ByteArrayOutputStream bout = new ByteArrayOutputStream();
  header.write(new DataOutputStream(bout));
  ByteArrayInputStream in = new ByteArrayInputStream(bout.toByteArray());
  
  when(connection.getResponseCode()).thenReturn(200);
  when(connection.getHeaderField(ShuffleHeader.HTTP_HEADER_NAME))
  .thenReturn(ShuffleHeader.DEFAULT_HTTP_HEADER_NAME);
  when(connection.getHeaderField(ShuffleHeader.HTTP_HEADER_VERSION))
  .thenReturn(ShuffleHeader.DEFAULT_HTTP_HEADER_VERSION);
  when(connection.getHeaderField(SecureShuffleUtils.HTTP_HEADER_REPLY_URL_HASH))
  .thenReturn(replyHash);
  when(connection.getInputStream()).thenReturn(in);
  
  when(mm.reserve(any(TaskAttemptID.class), anyLong(), anyInt()))
  .thenThrow(new DiskErrorException("No disk space available"));

  underTest.copyFromHost(host);
  verify(ss).reportLocalError(any(IOException.class));
}