test code v1

tests/TC040-symlink-broken.md

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+# Test Case: Broken Symlink
+
+**Test ID**: TC040-symlink-broken
+
+## Objective
+
+Verify `readlink(2)` succeeds for a deterministic broken link while following
+the target fails with exact `ENOENT`.
+
+## Fixture
+
+Use `images/inline.erofs` and `source/inline/brokenlink`. Evidence asserts
+symlink mode, layout 2, and target length 29.
+
+## Procedure
+
+```sh
+test -L "$mnt/brokenlink"
+readlink /tmp/repo22-g1/source/inline/brokenlink > /tmp/tc040-source-target
+readlink "$mnt/brokenlink" > /tmp/tc040-mount-target
+cmp /tmp/tc040-source-target /tmp/tc040-mount-target
+./read_probe expect-error "$mnt/brokenlink" 2
+./read_probe expect-error "$mnt/brokenlink" 2
+```
+
+## Expected Results
+
+- Both `readlink` targets equal `/nonexistent/repo22-g1-target`.
+- Both follow attempts return errno 2 (`ENOENT`), while the symlink itself
+  remains visible; no kernel error or cleanup failure occurs.