Schemathesis

Schemathesis generates test cases automatically from OpenAPI and GraphQL schemas. It applies property-based testing to produce a large number of valid and invalid requests, including boundary values, without test cases having to be written by hand.

Each response is validated against the API specification, which reveals server errors, schema violations and inconsistencies between the documentation and the implementation.

Schemathesis is distributed under the MIT licence and is actively developed on GitHub.