APIs need clear rules to work together. This skill helps you check those rules between different services. It uses contract testing to make sure changes don't break other parts of your system.
Tools like Pact and OpenAPI help you verify request and response formats. You can test consumer-provider contracts without running full integration tests. This saves time and catches issues early.
Teams use these tests in their CI pipeline to prevent breaking changes. Contract testing keeps services compatible as they evolve. It is a key practice for microservices and API versioning.
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