update

tests/TC122-deep-directory-tree.md

@@ -0,0 +1,56 @@
+# Test Case: Deep Directory Tree
+
+**Test ID**: TC122-deep-directory-tree  
+**Category**: Boundary & Stress  
+**Priority**: Medium  
+**Regression**: None
+
+## Objective
+
+Verify exact traversal, lookup, `getcwd`, and payload integrity through 128
+directory levels.
+
+## Preconditions
+
+- Complete `G7-MANUAL-SETUP.md`.
+- `DEEP-PATH` came from the verified fixture, not a hand-written `a/b/...`
+  placeholder.
+
+## Manual Steps
+
+```sh
+G7=/root/repo22-g7
+FIX=$G7/fixtures
+SRCROOT=$FIX/sources/boundaries
+IMAGE=$FIX/images/boundaries.erofs
+MNT=/mnt/repo22-g7-tc122
+E=$G7/evidence/TC122
+mkdir -p "$MNT" "$E"
+deep_path=$(cat "$FIX/DEEP-PATH")
+levels=$(printf '%s\n' "$deep_path" | awk -F/ '{ print NF - 2 }')
+printf 'levels=%s\npath=%s\n' "$levels" "$deep_path" \
+  | tee "$E/path.txt"
+test "$levels" -eq 128
+unit=$(mdconfig -a -t vnode -f "$IMAGE")
+mount -t erofs -o ro "/dev/$unit" "$MNT"
+cmp "$SRCROOT/$deep_path" "$MNT/$deep_path"
+source_hash=$(sha256 -q "$SRCROOT/$deep_path")
+target_hash=$(sha256 -q "$MNT/$deep_path")
+printf 'source=%s\ntarget=%s\n' "$source_hash" "$target_hash" \
+  | tee "$E/hashes.txt"
+test "$source_hash" = "$target_hash"
+deep_dir=$(dirname "$deep_path")
+(cd "$MNT/$deep_dir" && pwd -P) | tee "$E/getcwd.txt"
+test "$(cat "$E/getcwd.txt")" = "$MNT/$deep_dir"
+umount "$MNT"
+mdconfig -d -u "${unit#md}"
+test -z "$(mount -p | awk -v m="$MNT" '$2 == m { print }')"
+test -z "$(mdconfig -l | tr ' ' '\n' | grep -x "$unit")"
+```
+
+## PASS Gate
+
+- The metadata count is exactly 128 directory levels.
+- Deepest source/mount `cmp` and SHA256 values match.
+- `pwd -P` returns the exact mounted deepest directory.
+- No stack warning, panic, hang, or leaked mount/provider occurs.