test code v1

tests/TC023-extended-inode-normal.md

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+# Test Case: Extended Inode Decoding
+
+**Test ID**: TC023-extended-inode-normal
+
+## Objective
+
+Verify a real 64-byte extended regular inode, including size, full-width
+metadata, timestamps, and source-exact content.
+
+## Fixture
+
+Use `images/extended.erofs` and `source/extended/large-file.bin`.
+`fixture-evidence.txt` records the NID, byte offset, size, and `inode_size=64`.
+
+## Procedure
+
+```sh
+stat -f 'ino=%i size=%z mode=%p nlink=%l mtime=%m ctime=%c blocks=%b' "$mnt/large-file.bin"
+cmp /tmp/repo22-g1/source/extended/large-file.bin "$mnt/large-file.bin"
+sha256 /tmp/repo22-g1/source/extended/large-file.bin "$mnt/large-file.bin"
+```
+
+## Expected Results
+
+- The file reports the evidence/source size, regular `0644`, link count 1,
+  deterministic timestamps, and a 64-byte on-disk inode.
+- Full source compare and SHA256 match; cleanup succeeds.