Wraps Hasura GraphQL Engine testing patterns: docker-compose test instance, the metadata API for declarative schema/permission setup, x-hasura-role and x-hasura-user-id session headers for role-based permission tests, the v1/graphql endpoint via curl/HTTPie/native HTTP clients, and the role-by-table-by-operation permission-matrix pattern. Use for a metadata-driven Hasura engine where row-level permissions dominate; for a code-first server runtime harness use graphql-yoga-tests (Mercurius in its references) or apollo-server-tests instead, not this skill.