Function callback

test/test-misc-client-server.js:211–215

(err, stream)

  client.on('ready', mustCall(() => {
    function callback(err, stream) {
      assert(err, 'Expected error');
      assert(err.message === 'No response from server',
             `Wrong error message: ${err.message}`);
    }
    client.exec('uptime', mustCall(callback));
    client.shell(mustCall(callback));
    client.sftp(mustCall(callback));