test code v1

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+# Test Case: LZ4 Compression Large File Handling
+
+**Test ID**: TC085-lz4-large-file  
+
+**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  
+**Regression**: None
+
+## Objective
+Verify LZ4 decompression correctness for large files (>100MB).
+
+## Preconditions
+- Generated image: `images/lz4-large.erofs`
+- Test file: `/large.bin`, exactly 268435456 bytes
+- Reference: `sources/large/large.bin` and its generated SHA256
+- Mount point: `/mnt/test`
+
+## Test Steps
+1. Mount the image:
+   ```
+   mount -t erofs /dev/md0 /mnt/test
+   ```
+
+2. Verify file size reported correctly:
+   ```
+   stat -f %z /mnt/test/files/large-lz4.bin
+   ```
+
+3. Read entire file and compute checksum:
+   ```
+   sha256 -q /mnt/test/large.bin
+   sha256 -q sources/large/large.bin
+   cmp sources/large/large.bin /mnt/test/large.bin
+   ```
+
+4. Test partial reads at various offsets:
+   ```
+   read_probe pread /mnt/test/large.bin 52428800 10485760 guest.bin
+   read_probe pread sources/large/large.bin 52428800 10485760 source.bin
+   cmp source.bin guest.bin
+   read_probe pread /mnt/test/large.bin 209715200 10485760 guest.bin
+   read_probe pread sources/large/large.bin 209715200 10485760 source.bin
+   cmp source.bin guest.bin
+   ```
+
+5. Test random access reads:
+   ```
+   # Compare both guest ranges with the same source offsets.
+   read_probe pread /mnt/test/large.bin 4096000 4096 chunk1
+   read_probe pread /mnt/test/large.bin 204800000 4096 chunk2
+   ```
+
+## Expected Results
+- Step 2: Size is 268435456 bytes (256MB)
+- Step 3: Checksum matches reference value
+- Step 4: Partial reads succeed, no errors
+- Step 5: Random access works correctly
+
+## Verification Method
+- Verify data integrity via checksum
+- Confirm partial/random reads decompress correctly
+- Test memory usage during decompression reasonable
+- Verify no memory leaks or buffer overflows
+
+## Cleanup
+```
+umount /mnt/test
+mdconfig -d -u "${unit#md}"
+rm /tmp/chunk1 /tmp/chunk2
+```
+
+## Notes
+- Large file decompression tests pcluster handling
+- LZ4 decompression should be streaming (low memory)
+- Related tests: TC089 (pcluster mapping)