✅ Mutation testing: kill “mutants” & catch hidden blind spots
✅ Strict mocks: no more anyValue masking failures
✅ Assert side effects, not just return values
✅ Practical checklist to make tests unbreakable
📖 Full guide + real examples → Read on Medium
https://levelup.gitconnected.com/level-up-go-testing-2025-mutation-scoring-no-excuse-mocks-961c60dc9cdd
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