refactor: extract tunnel creation logic into a separate function for test

const service = new EnumType(["localhost.run", "serveo.net"]);

export const command = new Command()

  .type("service", service)

  .arguments("<port:integer>")

  .description(

    "Expose a local HTTP server to the public internet using a secure tunnel.\n\n" +

      "Note that the HTTP requests through the tunnel have X-Forwarded-* headers.",

  )

  .option("-s, --service <service:service>", "The localtunnel service to use.")

  .action(async (options, port: number) => {

    const spinner = ora({

export async function tunnelAction(

  options: { service?: "localhost.run" | "serveo.net" },

  port: number,

  deps: {

    openTunnel: typeof openTunnel;

    ora: typeof ora;

    console: typeof console;

    addSignalListener: typeof Deno.addSignalListener;

    exit: typeof Deno.exit;

  } = {

    openTunnel,

    ora,

    console,

    addSignalListener: Deno.addSignalListener,

    exit: Deno.exit,

  },

) {

  const spinner = deps.ora({

    text: "Creating a secure tunnel...",

    discardStdin: false,

  }).start();

  let tunnel: Tunnel;

  try {

      tunnel = await openTunnel({ port, service: options.service });

    tunnel = await deps.openTunnel({ port, service: options.service });

  } catch {

    spinner.fail("Failed to create a secure tunnel.");

      Deno.exit(1);

    deps.exit(1);

  }

  spinner.succeed(

    `Your local server at ${port} is now publicly accessible:\n`,

  );

    console.log(tunnel.url.href);

    console.error("\nPress ^C to close the tunnel.");

    Deno.addSignalListener("SIGINT", async () => {

  deps.console.log(tunnel.url.href);

  deps.console.error("\nPress ^C to close the tunnel.");

  deps.addSignalListener("SIGINT", async () => {

    await tunnel.close();

  });

  });

}

export const command = new Command()

  .type("service", service)

  .arguments("<port:integer>")

  .description(

    "Expose a local HTTP server to the public internet using a secure tunnel.\n\n" +

      "Note that the HTTP requests through the tunnel have X-Forwarded-* headers.",

  )

  .option("-s, --service <service:service>", "The localtunnel service to use.")

  .action(tunnelAction);