api-testing

Schema validation for GraphQL APIs checks query and mutation responses against a published GraphQL schema to prevent API drift. It validates types, required fields, and payload structures, catching contract violations during CI before they reach production environments.

Functional API testing covers successful requests and failure scenarios like missing authentication, wrong inputs, and duplicates. It validates expected behavior by asserting correct status codes and payload structures for both positive and negative test cases across HTTP endpoints.

Monitoring-style API assertions establish synthetic checks for response time, required fields, and SLA breaches. These deterministic checks run in CI to catch performance regressions quickly and ensure HTTP endpoints stay healthy under production conditions.

GraphQL API testing validates both queries and mutations through contract conformance checks against the published schema. It verifies response structures, detects schema drift, and ensures deterministic failure detection for GraphQL endpoints in CI pipelines.

A complete API test plan includes functional validation for expected behavior, auth verification for access control, edge case handling for wrong inputs, and contract checks against OpenAPI or GraphQL schemas. It combines status code assertions with payload structure validation.