test code v1

tests/TC035-file-read-sequential.md

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+# Test Case: Sequential Regular-File Read
+
+**Test ID**: TC035-file-read-sequential
+
+## Objective
+
+Verify buffered sequential reads return every byte of a deterministic
+multi-block regular file.
+
+## Fixture
+
+Use `images/flat.erofs` and `source/flat/data.txt`. Evidence asserts
+`FLAT_PLAIN`, NID, and size 262163.
+
+## Procedure
+
+```sh
+stat -f 'size=%z blocks=%b' "$mnt/data.txt"
+dd if="$mnt/data.txt" of=/tmp/tc035.out bs=4096
+cmp /tmp/repo22-g1/source/flat/data.txt /tmp/tc035.out
+sha256 /tmp/repo22-g1/source/flat/data.txt /tmp/tc035.out
+```
+
+Remove output, unmount, and detach.
+
+## Expected Results
+
+- `dd` reaches exact EOF and the complete output matches the source/hash.
+- No short read, data corruption, dmesg error, or cleanup failure occurs.