test code v1

tests/TC032-flat-inline-zero.md

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+# Test Case: FLAT_INLINE Zero-Length File
+
+**Test ID**: TC032-flat-inline-zero
+
+## Objective
+
+Verify an explicitly layout-2 zero-length compact inode returns clean EOF and
+zero allocation.
+
+## Fixture
+
+Use `images/inline-zero.erofs` and `source/inline/empty.txt`. The transformer
+asserts compact `FLAT_INLINE`, size 0, valid CRC, and records the image/source
+hashes.
+
+## Procedure
+
+```sh
+stat -f 'size=%z blocks=%b mode=%p' "$mnt/empty.txt"
+cmp /tmp/repo22-g1/source/inline/empty.txt "$mnt/empty.txt"
+test "$(wc -c < "$mnt/empty.txt")" -eq 0
+sha256 /tmp/repo22-g1/source/inline/empty.txt "$mnt/empty.txt"
+```
+
+## Expected Results
+
+- Size and byte count are zero, `st_blocks=0`, hashes match the empty source,
+  and no read error occurs.
+- Mount and cleanup succeed.