Mutation Testing of 50 Python Libraries Finds Tests Miss 41% of Planted Faults
A study of 2,312 planted faults across 50 Python libraries found tests in younger libraries missed 41% of them, and surfaced four real bugs, including a Windows data-loss issue.
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- 2026-11-12 15:00 · Towards Data Science
I Mutation-Tested 50 Python Libraries. Tests in the Young Ones Missed 41% of Planted Faults.