🧪 [Add tests for split_file_by_size in backup.py]

[marko1olo]

🎯 What: The testing gap addressed was the lack of unit tests for the split_file_by_size function in Dubsite_tgach/backup.py. This function is responsible for file splitting during backup mechanisms.
📊 Coverage: The scenarios now tested include:

• Files smaller than the chunk size (no split expected).
• Files exactly equal to the chunk size (no split expected).
• Files larger than the chunk size resulting in a partial remainder chunk (split into several full chunks and one partial).
• Files being exactly a multiple of the chunk size (split into equal full chunks).
• Full reconstruction of the split chunks verifying data integrity against the original payload.
  ✨ Result: The improvement in test coverage guarantees the structural safety and accuracy of the file splitting backup mechanism, mitigating risks of corrupted backups.

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PR created automatically by Jules for task 8110830457260414481 started by @marko1olo

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