GraphQL Testing
GraphQL testing verifies a GraphQL API's schema, resolvers, and query behavior — checking that queries and mutations return correctly shaped data, that authorization is enforced per-field where needed, and that deeply nested or complex queries don't cause performance or resource problems.
GraphQL's flexibility — clients can request exactly the fields they want, nested arbitrarily deep — creates testing challenges REST APIs don't have in the same way: a query can be technically valid but request an enormous, expensive nested payload, and authorization needs to be checked at the field level, not just the endpoint level, since a single query can touch many different resources at once.
Schema validation is central to GraphQL testing specifically because the schema is strongly typed and self-documenting — tools can generate test queries directly from the schema, and breaking schema changes (removing a field a client depends on) are detectable automatically by comparing schema versions.
