Mutation testing reveals 50% of faults survive in MonkeyCode agent-generated code

Tactics · Dev.to · stat: 2/4 faults

MonkeyCode's code-generation model produced a bounded queue implementation and test suite that passed all initial unit checks. Developer datacpp_8185 reports that mutation testing, which deliberately seeds faults to verify test coverage, revealed two of four seeded faults survived the agent-generated test suite.

Agents writing their own tests inherit their own blind spots. Founders using AI codegen must implement mutation testing pipelines to catch silent, critical bugs that standard green test suites miss.

Source