is there a programmatic api for interacting with stdout and stdin? I'm wanting to write some tests for some cli tools

I've had a hard time ascertaining how to do this from the readme, and could use some help, but I imagine something like this: a utility I may have: ```ts export function cli(args: string[] = []) { let cmd = `node ${cliPath} ${args.join(" ")}`; console.log(`Running '${styleText("cyan", cmd)}'`); let output = new MockWritable(); let input = new MockReadable(); let execaPromise = execa("node", args, { shell: true, stdout: output, stdin: input }); return { execaPromise, output, input, }; } ``` and then usage: ```js let { output, input } = cli('...') // runs until user is prompted await output.next(); if (output.text.last.includes("Confirm?")) { // confirm a prompt input.type('[Enter]'); } await output.next(); ``` idk 🤷 I've never really found good CLI testing tools before, so I'm open to whatever