API Test Pipelines Often Miss Business Logic Bugs, Not Just Coverage Gaps

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Many engineering teams believe their API testing is solid because pipelines run on every pull request and coverage metrics look healthy, yet production bugs still slip through. The core issue is a disconnect between test automation maturity — the tooling, CI integration, and reporting — and test substance, meaning whether tests actually cover real business logic and domain rules. Bugs that reach production rarely stem from a single invalid field; they typically arise from invalid combinations of fields that each appear correct in isolation. Experts argue that teams plateau when they stop at spec-conformance testing and never advance to validating the business rules the system truly depends on. The recommended fix is not adopting new tools but auditing the gap between automation depth and coverage depth, then prioritising tests for high-risk flows where failures would be most costly.

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