test code v1

tests/TC042-dirent-large-dir.md

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+# Test Case: Directory Entry Decoding - Multi-Block Directory
+
+**Test ID**: TC042-dirent-large-dir
+**Category**: Directory Operations
+**Priority**: High
+
+## Objective
+
+Decode a real multi-block directory without missing, duplicating, or
+truncating entries across directory-block boundaries.
+
+## Procedure
+
+Mount metadata/namei-base.erofs and run:
+
+    ./readdir_probe /tmp/repo22-g3/mnt/wide 128
+    find /tmp/repo22-g3/mnt/wide -maxdepth 1 -type f |
+      sed 's#.*/##' | sort > actual-wide.txt
+    cmp fixtures/metadata/expected-wide.txt actual-wide.txt
+    stat /tmp/repo22-g3/mnt/wide/entry-000-abcdefghijklmnopqrstuvwxyz.txt
+    stat /tmp/repo22-g3/mnt/wide/entry-159-abcdefghijklmnopqrstuvwxyz.txt
+    stat /tmp/repo22-g3/mnt/wide/entry-319-abcdefghijklmnopqrstuvwxyz.txt
+
+## Expected Results
+
+All 320 real files plus dot and dotdot are returned once. The helper reports
+322 restartable kernel and libc positions and the three boundary samples stat
+successfully. Record the image hash and cleanup.