test code v1

tests/TC044-lookup-not-found.md

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+# Test Case: Lookup - Missing Entry
+
+**Test ID**: TC044-lookup-not-found
+**Category**: Directory Operations
+**Priority**: High
+
+## Objective
+
+Verify direct missing lookups return exact ENOENT without masking existing
+entries or turning other errors into a miss.
+
+## Procedure
+
+Mount vfs/vfs-plain.erofs and run:
+
+    ./g3_vfs_probe expect-error stat \
+      /tmp/repo22-g3/mnt/testdir/nonexistent.txt 2
+    ./g3_vfs_probe expect-error stat \
+      /tmp/repo22-g3/mnt/testdir/nonexistent.txt 2
+    ./g3_vfs_probe expect-error stat \
+      /tmp/repo22-g3/mnt/no-such-directory/file.txt 2
+    ./g3_vfs_probe expect-success stat \
+      /tmp/repo22-g3/mnt/testdir/file.txt
+
+## Expected Results
+
+Each missing syscall reports errno 2 and the positive control succeeds.
+Wrapper text alone is not evidence; record the helper output and cleanup.