assertEquals("0123456789", readFile("target/scp/out.txt"));
OutputStream os = c.put(target.getPath(), null, ChannelSftp.APPEND, -5);
os.write("a".getBytes());
os.close();
c.disconnect();
assertTrue(target.exists());
assertEquals("01234a", readFile("target/scp/out.txt"));
target.delete();