A module-scoped pytest fixture shares one mutable clone, so execution order decides green or red

Domain: testing · Evidence E1 — Maintainer reviewed

pytestfixture-scopetest-isolationorder-dependencepytest-randomlyregression-guard

Summary

A pytest fixture declared with `scope="module"` handed the **same mutable clone** to three sandbox tests. A mutator test wrote a probe file and ran the generato…

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