Unverified50% confidenceBenchmarkExact time
Engineering practice data from Google shows that changes under 100 lines have notably better review pass rates and defect discovery rates than large changes.
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50%
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Long-term
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9/7/2026
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VerifiedGoogle's engineering practice research indicates that code review can detect approximately 60% of defects, far exceeding the approximately 30% detection rate of unit testing.78% similarUnverifiedGoogle内部研究显示，当工具误报率超过10%时，开发者的采纳率会急剧下降74% similarUnverifiedInternal Google research indicates that projects using TDD have a defect density 40%–90% lower than those developed with traditional approaches73% similarUnverifiedGoogle在2021年发表的研究论文指出，在其数据中心规模下静默数据损坏的发生率极低但绝非零70% similarUnverifiedGoogle 内部统计数据表明，E2E 测试与单元测试的数量比例建议维持在 1:10 乃至更低66% similar
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