What is the recommended way to test cliffy cli ap?

[maxkoretskyi]

Let's say I have this very basic command:

async function setupSMPT() {
  let smtpUsername = "NA";
  let smtpPassword = "NA";

  const confirm = await Confirm.prompt(
    "Do you want to setup a connection with a SMTP server?",
  );

  if (confirm) {
    smtpUsername = await Input.prompt(
      "Please specify the username to connect to your SMTP server:",
    );
    smtpPassword = await Input.prompt(
      "Please specify the password to connect to your SMTP server:",
    );
  }

  return { smtpUsername, smtpPassword };
}

const smtp = new Command()
  .name("smtp")
  .option(
    "--interactive [interactive:boolean]",
    "Enable or disable interactive mode.",
    { default: true },
  )
  .action(setupSMPT)

await new Command()
  .name("root")
  .command("smtp", smtp)
  .parse(Deno.args);

How can I test it? Basically, it's 2 sub-tasks I need to do:

1. Provide a stub for promps used in the action function. Is there a helper for this?
2. Run the command either as a subprocess with Deno.run/spawnChild or directly calling an action function setupSMPT({...})

Any help is appreciated!