Contract testing is a form of automated testing that checks whether components of a system have broken their data contracts with one another. When breaking up a monolith into services, honoring these contracts or clearly communicating when they need to be broken is essential to building, integrating, and maintaining a high-performing system. Contract testing is not a form of formal specification per se, but rolling it out follows roughly the same process. It requires every endpoint to have a spec written in a specific markup language that the contract testing tool can parse and check for
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