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Count the Clocks Before Characterization Tests: A Nondeterminism Census for Messy Repos

This story is from 2026-10-27. It is preserved in the archive; the latest stories are on the live feed.

Characterization tests fail for a boring reason: the code reads the wall clock. You cannot pin behavior you cannot reproduce twice. So count the clocks first, then move code. There is a second trap. unittest.mock.patch targets a dotted path, not an object. A refactor that moves a module silently br…

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  1. 2026-10-27 09:37 · DEV Community — AI
    Count the Clocks Before Characterization Tests: A Nondeterminism Census for Messy Repos

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