test code v1

tests/TC033-tailpacking-normal.md

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+# Test Case: FLAT_INLINE Tailpacking
+
+**Test ID**: TC033-tailpacking-normal
+
+## Objective
+
+Verify a 5000-byte file reads exactly across its full data block and 904-byte
+inline tail boundary.
+
+## Fixture
+
+Use `images/inline.erofs` and `source/inline/tailpacked.dat`. Evidence asserts
+layout 2 and size 5000.
+
+## Procedure
+
+```sh
+stat -f 'size=%z blocks=%b' "$mnt/tailpacked.dat"
+cmp /tmp/repo22-g1/source/inline/tailpacked.dat "$mnt/tailpacked.dat"
+sha256 /tmp/repo22-g1/source/inline/tailpacked.dat "$mnt/tailpacked.dat"
+./read_probe pread "$mnt/tailpacked.dat" 4080 64 /tmp/tc033-mounted-range
+dd if=/tmp/repo22-g1/source/inline/tailpacked.dat \
+  of=/tmp/tc033-source-range bs=1 skip=4080 count=64 2>/dev/null
+cmp /tmp/tc033-source-range /tmp/tc033-mounted-range
+```
+
+Remove outputs, unmount, and detach.
+
+## Expected Results
+
+- Full file and the range crossing logical offset 4096 match the source.
+- The transition from plain block data to metadata tail is seamless and
+  cleanup succeeds.