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tests/TC045-lookup-case-sensitive.md

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+# Test Case: Lookup - Case Sensitivity
+
+**Test ID**: TC045-lookup-case-sensitive
+**Category**: Directory Operations
+**Priority**: High
+
+## Objective
+
+Verify four distinct case variants resolve independently and an unrecorded
+case variant returns ENOENT.
+
+## Procedure
+
+Mount vfs/vfs-plain.erofs and run:
+
+    stat -f 'name=%N ino=%i size=%z' \
+      /tmp/repo22-g3/mnt/testdir/file.txt \
+      /tmp/repo22-g3/mnt/testdir/File.txt \
+      /tmp/repo22-g3/mnt/testdir/FILE.TXT \
+      /tmp/repo22-g3/mnt/testdir/FiLe.TxT
+    ./g3_vfs_probe expect-error stat \
+      /tmp/repo22-g3/mnt/testdir/fILE.txt 2
+
+## Expected Results
+
+The four exact variants have four nonzero, distinct NIDs and their recorded
+sizes. The unmatched spelling returns errno 2. Record output and cleanup.