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How to Build Contract-Driven API Tests With OpenAPI and AI

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Hi! I’m Oleg, a QA Engineering Manager focused on test strategy, automation, and AI-assisted QA workflows.

This is a continuation of a series on where AI actually earns its place in QA — and this time the answer starts somewhere less glamorous than AI: with the OpenAPI spec.

The short version: we generate a Java API client from Swagger, write tests against that generated client, measure coverage against the spec automatically in GitLab CI, and hand the resulting gaps to an LLM as a structured JSON report so it can write the missing tests.
The problem: tests that drift away from the contract
A very common failure mode in API testing is that tests live separately from the API contract.

A QA engineer assembles URLs by hand, writes JSON by hand, parses responses by hand. Swagger exists somewhere nearby — analysts and developers keep it updated, the tests nominally check...

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