Is it possible to suppose on the current process IO ?

Sorry this is not an issue, just a question. I would like not to spawn new processes but use the same parent process stdin and stdout streams. In my case I would like just to use suppose in integration tests but, instead spawning new processes, call my functions (that perform some interactive cmdline stuff).

I tried with something like the following but without luck:

process.stdout
  .pipe(SupposeStream())
  .when('Hi')
  .respond('Bye')
  .pipe(process.stdin)

// the following stdout would be the function I would like to test. suppose should respond with Bye but is not :(
console.log('Hi')  
setTimeout(() => {
  console.log('Hi')
}, 1000)

Do you know If I'm missing something? Thanks and BTW great project

Start by reviewing the shown SupposeStream pipeline and Node.js process.stdin/process.stdout behavior. Determine whether the existing-process integration-test scenario is supported, and document the supported usage or limitation.