Developer Finds 66% of Engine Assertions Untested Despite 100% Green Test Suite

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A software developer built a custom mutation-testing script to verify whether quality gates in their engine were actually catching errors, or merely running without detecting anything. The tool systematically disabled each fail() assertion one by one and checked whether any existing test would notice its absence. Out of 61 protection lines examined, 40 were completely untested, revealing a 66% blind spot rate. This occurred even though the standard test suite simultaneously reported a perfect score of 36 out of 36 mutants caught. The findings highlight a critical gap in software quality assurance: a fully green test suite can coexist with an engine where the majority of its guards offer no real protection.

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