Lock Output File Hashes Before Refactoring Legacy Scripts, Dev Guide Advises

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A software development guide published on DEV Community recommends capturing SHA-256 hashes of output files as a safety net before refactoring brownfield codebases. The approach involves running a script against fixture data, hashing the resulting file tree, and saving that hash manifest as a golden reference. On subsequent refactoring passes, the test suite re-runs the script and compares fresh output hashes against the saved manifest to confirm behavior has not changed. The method deliberately excludes volatile data such as timestamps, process IDs, and working-directory paths to keep the manifest stable across machines. A sample inventory CLI called stocktake.py, along with helper scripts hash_tree.py and test_stocktake_tree.py, is provided to illustrate the full workflow.

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