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Count the Argument Shapes Your Fixtures Never See Before Refactoring a Messy Module

This story is from 2026-10-26. It is preserved in the archive; the latest stories are on the live feed.

A shipping-cost module has twelve tests, all passing, and a refactor that looks mechanical. Someone extracts the rate calculation into a helper, the suite stays green, and the change ships. Three days later a batch job that passes an empty line-item list starts returning None instead of 0.0 , becau…

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  1. 2026-10-26 11:30 · DEV Community — AI
    Count the Argument Shapes Your Fixtures Never See Before Refactoring a Messy Module

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