test code v1

tests/TC020-compact-inode-basic.md

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+# Test Case: Compact Inode Decoding
+
+**Test ID**: TC020-compact-inode-basic
+
+## Objective
+
+Verify a real 32-byte compact regular inode exposes correct mode, link count,
+size, allocation, and source-exact data.
+
+## Fixture
+
+Use `images/compact.erofs` and `source/compact/small.txt`. The evidence records
+the NID and asserts `inode_size=32`.
+
+## Procedure
+
+After mounting on `$mnt`:
+
+```sh
+stat -f 'ino=%i size=%z mode=%p nlink=%l blocks=%b mtime=%m' "$mnt/small.txt"
+wc -c /tmp/repo22-g1/source/compact/small.txt "$mnt/small.txt"
+cmp /tmp/repo22-g1/source/compact/small.txt "$mnt/small.txt"
+sha256 /tmp/repo22-g1/source/compact/small.txt "$mnt/small.txt"
+```
+
+Unmount and detach the exact md unit.
+
+## Expected Results
+
+- The inode is compact, regular mode `0644`, link count 1, timestamp 0, and
+  size equal to the source.
+- Full content and hashes match; all operations and cleanup return zero.