Your Go Tests Pass, But Do They Actually Test Anything? An Introduction to Mutation Testing
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GitHub Copilot, Cursor, Claude Code — these tools can generate hundreds of lines of Go in seconds. But there's a problem that doesn't get enough attention: AI-generated code ships with AI-generated confidence, not correctness. Your test suite says "all green." Your coverage report says 85%. But how many of those tests actually catch real bugs? How many are just going through the motions — executing code paths without verifying behavior? This is where mutation testing comes in. And this is why