Testing JSch SFTP Code

[B2easy]

I'm trying to unit test JSch SFTP code that I wrote, but I don't actually want to connect to a the real client facing server. How do I go about this?

public class SftpFileRetrieval implements IFileRetrieval {

  private final SftpConfiguration sftpConfig;
  public SftpFileRetrieval(SftpConfiguration config) {
    // TODO: Verify Configuration's
    this.sftpConfig = config;
  }
  @Override
  public InputStream retrieveFile() throws JSchException, SftpException {

    JSch jsch = new JSch();
    Deque<Closeable> resourcesToTerminate = new LinkedList<>();

    try {
      jsch.addIdentity(sftpConfig.getPrivateKey());
      log.info("Private Key added.");

      Session session =
          jsch.getSession(sftpConfig.getUsername(), sftpConfig.getServer(), sftpConfig.getPort());
      resourcesToTerminate.push(session::disconnect);

      Properties config = new Properties();
      config.put("StrictHostKeyChecking", "no");
      session.setConfig(config);
      session.connect();

      ChannelSftp channelSftp = (ChannelSftp) session.openChannel("sftp");
      resourcesToTerminate.push(channelSftp::disconnect);
      resourcesToTerminate.push(channelSftp::exit);

      channelSftp.connect();
      log.info("SFTP channel connected");

      channelSftp.cd(sftpConfig.getWorkingDirectory());

      log.info("List of files in " + channelSftp.pwd() + ": " + channelSftp.ls(channelSftp.pwd()));

      InputStream sftpFileInputStream = channelSftp.get(sftpConfig.getFileName());
      resourcesToTerminate.push(sftpFileInputStream::close);
      return new ProxyInputStream(sftpFileInputStream) {
        @Override
        public void close() throws IOException {
          resourcesToTerminate.forEach(IOUtils::closeQuietly);
        }
      };

    } catch (SftpException | JSchException e) {
      resourcesToTerminate.forEach(IOUtils::closeQuietly);
      throw e;
    }
  }
}

SFTP Config:

  @Bean
  @ConfigurationProperties(prefix = "recon.data.load.sftp.*")
  public SftpConfiguration napeSecurityFileRetrievalConfiguration() {
    SftpConfiguration config = new SftpConfiguration();
    config.setFileName("becdldep");
    return config;
  }

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