test code v1

tests/TC061-setattr-chmod-reject.md

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+# Test Case: chmod Rejection
+
+**Test ID**: TC061-setattr-chmod-reject
+**Category**: Read-Only Enforcement
+**Priority**: Critical
+
+## Objective
+
+Verify a direct chmod request returns EROFS and leaves metadata unchanged.
+
+## Procedure
+
+Mount vfs/vfs-plain.erofs and run:
+
+    ./g3_vfs_probe stat /tmp/repo22-g3/mnt/testdir/file.txt > TC061-before.txt
+    ./g3_vfs_probe expect-error chmod \
+      /tmp/repo22-g3/mnt/testdir/file.txt 30
+    ./g3_vfs_probe stat /tmp/repo22-g3/mnt/testdir/file.txt > TC061-after.txt
+    cmp TC061-before.txt TC061-after.txt
+
+## Expected Results
+
+chmod reports errno 30 and complete metadata remains unchanged. Record output,
+fixture hash, and cleanup.