rc-minitest-openapi

https://github.com/RailsComposer/minitest-openapi

rc-minitest-openapi turns Rails minitest integration tests into the source of truth for an OpenAPI 3.0 document. Tests declare each operation and its response schema, the live response is validated against that schema as the suite runs, and the openapi:generate rake task writes the document. An rswag-style block DSL and plain helper methods are both supported.