Allow faking a terminal for testing about atty HOT 6 OPEN

Actually, I'm not entirely certain this is so useful. I was able to relatively cleanly add testing to my own project, so I don't have a strong use case for it. Other projects that use atty might be structured differently and thus benefit from the ability to mock atty, but not mine.

from atty.

Nice. I'll leave this open in case you need it. Also neat project!

from atty.

@casey how did you do this in just?

This might also be useful for #15.

from atty.

Hmm, it's been a while since I wrote the tests. I think that I had an option to force color, regardless of if we were printing to a terminal, so if I wanted to test formatting I could set that option to be true.

from atty.

We have something like:

fn permission_prompt(message: String) -> DenoResult<()> {
  if !atty::is(atty::Stream::Stdin) || !atty::is(atty::Stream::Stderr) { return Err(permission_denied()) };
  eprint!("{} Grant? yN", message);
  ...  // more stuff

What maybe you'd want to do is refactor to use dependency injection instead? https://stackoverflow.com/a/28370712/1240268 but then you not able to get an atty::Stream.

from atty.

Okay, here's one way to fake TTYs in stdin, stdout and stderr:
https://stackoverflow.com/a/52954716/1240268
https://gist.github.com/hayd/4f46a68fc697ba8888a7b517a414583e

from atty.