Test updates#144

Merged

sunfishcode merged 2 commits intomainfrom

sunfishcode/test-updates

Jan 26, 2021

Commits on Jan 25, 2021

Update the is-read-write.rs test for the rename to `IsFileReadWrite`.
sunfishcode
committed

Commits on Jan 26, 2021

Port the symlink_hard_link test from Rust.
sunfishcode
committed