Testing
E2E testing for GraphQL-powered apps requires different techniques than REST APIs. With REST, you intercept by URL (/api/users). With GraphQL, every query hits the same endpoint (/graphql), so you intercept by operation name or query content. Both Playwright and Cypress support GraphQL intercepting well. This guide shows you how
Testing
Apollo Server's executeOperation is excellent for most GraphQL testing. But sometimes you need to test the full HTTP stack — middleware, authentication headers, CORS, rate limiting, and HTTP error codes. Supertest lets you do that: it sends real HTTP requests against your Express/Fastify application without starting a network
Testing
Apollo Server is the most popular GraphQL server for Node.js. Its testing story is surprisingly good: executeOperation lets you run queries against an in-memory server without HTTP overhead, making integration tests fast and deterministic. This guide focuses on the practical patterns you need for testing Apollo Server 4 applications
Testing
"Should we use Pact or integration tests?" is a question that comes up whenever a team starts decomposing a monolith into services. The honest answer is: it depends on your team structure, deployment cadence, and tolerance for the complexity each approach introduces. This article explains both approaches clearly,
Testing
Local pact files work fine when you have one consumer and one provider. As soon as you have five consumers and ten providers, file-sharing falls apart. You need a central store for pacts and verification results — somewhere all teams can publish to and read from. That's what PactFlow
Testing
Contract testing with Pact shines brightest in Node.js microservice environments. Most Node.js APIs are Express or Fastify apps — they're relatively thin, the test setup is familiar, and pact-js integrates cleanly with Jest. This guide walks through a complete, realistic example from consumer test to provider verification
Testing
Testing GraphQL APIs is fundamentally different from testing REST. With REST, each endpoint has a specific contract. With GraphQL, a single endpoint handles arbitrary queries, and the surface area is determined by your schema. A change to a resolver can affect dozens of queries the client might send. This guide
Testing
GraphQL schema evolution is a double-edged sword. The schema gives you a formal contract between clients and servers. But that contract is only useful if you enforce it — if you can detect when a server-side change would break existing clients before it reaches production. This guide covers the tools and
Testing
Contract tests are only valuable if they run automatically and block bad deployments. A pact that exists locally but isn't in your CI pipeline is theater. This guide shows you how to wire Pact into GitHub Actions and Jenkins so that contract verification is a real deployment gate,
Testing
Running Detox tests locally is one thing. Getting them running reliably in CI is another. Mobile E2E tests have historically been the most painful part of CI/CD pipelines: emulators crash, builds are slow, and tests that pass locally fail for reasons that are hard to diagnose. This guide covers
Testing
Unit tests are the foundation of a React Native test strategy. They run fast, give immediate feedback, and catch logic errors long before they reach a device or simulator. Yet many React Native teams skip them or write tests that test nothing meaningful. This guide covers the practical patterns you
Testing
Native modules are the bridge between your JavaScript code and platform APIs — camera, geolocation, biometrics, push notifications, Bluetooth. They're essential for real apps, but they're also the reason React Native unit tests break: native modules don't exist in a Jest environment running on Node.