prettier-cli test: migrate `write` tests

Copies the write tests from prettier.

Notable differences:

Unchanged files are still listed in the output in prettier, but not here (e.g. foo.js (unchanged))
Written files also log out the time taken in prettier (e.g. foo.js 0ms)

Mar 04 '25 13:03 43081j

Should we align with prettier here, outputting an elapsed time too (if it's big enough?) and outputting the "(unchanged)" bit? 🤔

Mar 06 '25 01:03 fabiospampinato

I'm not sure. It's given per file so seems a bit unnecessary in that case, since each one is usually "0ms" individually

Mar 06 '25 08:03 43081j

About

the "(unchanged)"

people are asking to remove it, I already mark this as accepted. https://github.com/prettier/prettier/issues/15480

Mar 06 '25 08:03 fisker

Ah awesome

I think we are already all good then 👍 for that particular behaviour

Mar 06 '25 08:03 43081j

"0ms" because we can't snapshot the real time , It's mocked.

Apr 22 '25 23:04 fisker

aha very good point! so we should drop the unchanged but keep the timing i suppose

Apr 23 '25 21:04 43081j