The current tests don't cover anything non-trivial.
Created attachment 380432 [details] patch
Created attachment 380433 [details] patch
Comment on attachment 380433 [details] patch Clearing flags on attachment: 380433 Committed r250862: <https://trac.webkit.org/changeset/250862>
All reviewed patches have been landed. Closing bug.
<rdar://problem/56089542>