[andreaTP]

The WASI testsuite only ran on ZeroFs, so differences of the JDK's default file system on each OS went unnoticed (#274, #280). This also runs it on a JUnit @TempDir of the host file system.

• wasi-test-gen-plugin gets a hostFileSystem option that generates SuiteTestsuiteHostTest, with the same tests as the ZeroFs suite, through WasiTestRunner.executeOnHost.
• wasi-tests enables it on JDK 25 and later: older JDKs cannot set file times with nanosecond precision (JDK 11 for files, JDK 17 and 21 for symlinks on Linux), which the testsuite checks.
• On Windows the runner sets the testsuite's NO_RENAME_DIR_TO_EMPTY_DIR and skips path_link, as Java does not expose Windows file IDs and hard links get different inode numbers.
• The filestat test from wasi: read file stats without the "unix" attribute view #282 now also runs on a host directory.

Fixes found by the new suite:

• Renaming a directory onto a non-empty directory returned EIO instead of ENOTEMPTY on the default file system.
• Creating a file with O_CREAT failed with EACCES when the preopened directory is reached through a symlink, as with /tmp on macOS or the short temp path on Windows.

The first commit is #283, needed for the Windows run; it drops out on rebase once #283 is merged.

[andreaTP]

FYI @JosepMariaBlasco I'm trying to cover the testing gap here, let see how deep is the rabbit hole 😅

[JosepMariaBlasco]

Thanks, happy to run our Windows checks against it when it’s ready.