API Testing Skills for AI Agents

API testing with Playwright APIRequestContext for REST and GraphQL endpoints

Production-grade REST API automation framework with REST Assured, POJO serialization using GSON, PayloadManager pattern, E2E integration workflows with TestNG ITestContext, and Allure reporting.

HTTP assertion library for Node.js API testing with Express, Koa, and Fastify

GraphQL API testing with schema validation, query testing, and mutation verification

Postman collections, environments, pre-request scripts, and Newman CI

Testing API versioning strategies including URL path, header, and query parameter versioning with backward compatibility validation.

gRPC service testing including protobuf validation, streaming tests, error handling, deadline testing, and load testing for gRPC endpoints.

Comprehensive RESTful API testing patterns covering HTTP methods, status codes, request/response validation, authentication, error handling, and contract testing.

Automatically generate comprehensive API test suites from OpenAPI specifications covering CRUD operations, error handling, authentication, pagination, and edge cases

FastAPI application testing with TestClient, dependency injection overrides, async testing, database testing with SQLAlchemy, and OpenAPI validation.

Validate API responses against OpenAPI/Swagger specifications, JSON Schema definitions, and consumer-driven contracts to prevent breaking changes

Express.js API testing with supertest, middleware testing, route handler testing, error handling verification, and authentication testing.

Java REST API testing with REST Assured including JSON schema validation

Testing webhook implementations including delivery verification, retry logic, signature validation, idempotency, and failure handling patterns.

Generate consumer-driven contract tests using Pact framework to verify API provider-consumer compatibility and prevent integration breaking changes

NestJS application testing with @nestjs/testing, dependency injection mocking, e2e testing with supertest, guard testing, and pipe validation testing.

Automated detection of breaking API changes including response format changes, removed endpoints, type changes, and deprecation enforcement.

Automatically generating API tests from OpenAPI/Swagger specifications including request validation, response schema checking, and edge case generation.

API endpoint fuzzing for discovering unexpected behaviors, crashes, and security vulnerabilities through malformed requests, boundary values, and protocol violations.

Flask application testing with test client, fixture patterns, SQLAlchemy model testing, blueprint testing, and Flask-specific extension testing.

Testing pagination implementations including cursor-based, offset-based, keyset pagination with edge cases, performance, and consistency verification.

OpenAPI/Swagger specification validation and testing to ensure API implementations match their documented contracts with automated drift detection.

Automated API testing using Postman collections with Newman CLI for CI/CD integration, environment management, and test reporting.

SOAP web service testing including WSDL validation, XML schema testing, WS-Security, and SOAP fault handling verification.

Consumer-driven contract testing with Pact and Pact Broker

Testing API schema evolution patterns including additive changes, field deprecation, type widening, and backward-compatible migration strategies.

Enterprise-grade Playwright test automation framework using 8-layer architecture with Page Object Model, Module Pattern, custom fixtures, API testing layer, structured logging, data generators, multi-browser support, Docker, CI/CD pipelines, and custom HTML reporting.