api-testing

To test a REST API endpoint using Supertest, you write a test script that imports your Express app and verifies the HTTP response, such as asserting a 200 status code for successful requests.

Contract testing for APIs validates that services adhere to agreed data schemas and interactions. You need contract testing when integrating REST or GraphQL services to catch regressions early and enforce robust behavior.

Yes, you can use mock servers with GraphQL testing workflows. Tools like MSW allow you to intercept and mock network requests, enabling isolated unit and integration tests for your GraphQL services.

Zod schema validation works for API testing by enforcing data contracts and validating API responses. It integrates into your testing strategy to ensure endpoint payloads match expected structures.

The best way to automate API testing across REST and GraphQL services is to implement opinionated testing guidance covering unit, integration, and end-to-end tests using tools like Supertest, Pact, and MSW.

Pact helps with API contract verification by defining consumer-driven contracts, ensuring that REST or GraphQL providers and consumers communicate correctly and preventing integration regressions across environments.