test code v1

tests/TC062-setattr-chown-reject.md

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+# Test Case: chown Rejection
+
+**Test ID**: TC062-setattr-chown-reject
+**Category**: Read-Only Enforcement
+**Priority**: Critical
+
+## Objective
+
+Verify a privileged direct chown request returns EROFS and leaves ownership
+unchanged.
+
+## Procedure
+
+Mount vfs/vfs-plain.erofs as root and run:
+
+    ./g3_vfs_probe stat /tmp/repo22-g3/mnt/testdir/file.txt > TC062-before.txt
+    ./g3_vfs_probe expect-error chown \
+      /tmp/repo22-g3/mnt/testdir/file.txt 30
+    ./g3_vfs_probe stat /tmp/repo22-g3/mnt/testdir/file.txt > TC062-after.txt
+    cmp TC062-before.txt TC062-after.txt
+
+## Expected Results
+
+chown to uid/gid 65534 reports errno 30 and metadata remains unchanged. Record
+output and cleanup.