The added test uses methods not available on POSIX systems.
Created attachment 442835 [details] Patch
Created attachment 442841 [details] Patch
Created attachment 442860 [details] Patch
Committed r285061 (243704@main): <https://commits.webkit.org/243704@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 442860 [details].
<rdar://problem/84827838>