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+# Test Case: DEFLATE Level 1 Read Correctness
+
+**Test ID**: TC102-deflate-level1
+
+**G5 fixture contract**: Use [G5-MANUAL-SETUP.md](G5-MANUAL-SETUP.md).
+Its generated paths, source comparisons, structured corruption offsets, and
+cleanup rules supersede placeholder examples in this file.
+**Category**: Compression
+**Priority**: High
+
+## Objective
+
+Verify full and offset reads from an erofs-utils 1.8.6 DEFLATE level 1 image.
+
+## Fixture and Helper
+
+```sh
+work=$(mktemp -d /tmp/repo22-tc102.XXXXXX)
+tests/prepare_error_fixtures.sh "$work/fixtures"
+cc -O2 -Wall -Wextra -std=c17 tests/read_probe.c -o "$work/read_probe"
+dump.erofs -s "$work/fixtures/valid-deflate-level1.erofs"
+dump.erofs --path=/compressed.bin -e \
+  "$work/fixtures/valid-deflate-level1.erofs"
+```
+
+The superblock and extent output must identify DEFLATE-compressed data. The
+image is generated with `-zdeflate,level=1 -C65536`.
+
+## FreeBSD Procedure
+
+```sh
+mkdir "$work/mnt"
+unit=$(mdconfig -a -t vnode \
+  -f "$work/fixtures/valid-deflate-level1.erofs")
+mount -t erofs -o ro "/dev/$unit" "$work/mnt"
+
+expected=$(sha256 -q "$work/fixtures/source/compressed.bin")
+actual=$(sha256 -q "$work/mnt/compressed.bin")
+test "$actual" = "$expected"
+"$work/read_probe" pread "$work/mnt/compressed.bin" 32768 4096 \
+  "$work/guest-range.bin"
+"$work/read_probe" pread "$work/fixtures/source/compressed.bin" 32768 4096 \
+  "$work/source-range.bin"
+cmp "$work/source-range.bin" "$work/guest-range.bin"
+
+umount "$work/mnt"
+mdconfig -d -u "${unit#md}"
+```
+
+## Expected Results
+
+The complete mounted-file hash equals the source hash, and the fixed 4 KiB
+range compares byte-for-byte. The invalid former command
+`sha256 output vs original` is not used.