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tests/TC053-vfs-hash-integration.md

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+# Test Case: Stable Vnode Identity Behavior
+
+**Test ID**: TC053-vfs-hash-integration
+**Category**: VFS Integration
+**Priority**: High
+
+## Objective
+
+Verify repeated resolutions of one EROFS NID expose one stable vnode identity
+and file handle within a mount. This is behavior-level coverage of the
+vfs_hash contract; it does not directly observe the internal hash bucket.
+
+## Procedure
+
+Mount vfs/vfs-plain.erofs and run:
+
+    stat -f 'ino=%i gen=%v size=%z' \
+      /tmp/repo22-g3/mnt/testdir/file.txt > TC053-a.txt
+    stat -f 'ino=%i gen=%v size=%z' \
+      /tmp/repo22-g3/mnt/testdir/./file.txt > TC053-b.txt
+    cmp TC053-a.txt TC053-b.txt
+    ./nfs_fh_tool capture /tmp/repo22-g3/mnt/testdir/file.txt TC053-a.fh
+    ./nfs_fh_tool capture /tmp/repo22-g3/mnt/testdir/./file.txt TC053-b.fh
+    ./nfs_fh_tool compare TC053-a.fh TC053-b.fh
+    ./nfs_fh_tool describe TC053-a.fh
+
+## Expected Results
+
+Metadata and handles are identical and the handle NID/generation matches stat.
+Record this observable identity behavior, handle hash, and cleanup.