Testing
When it comes to end-to-end testing for React Native apps, two frameworks dominate the conversation: Detox and Appium. Both can drive real devices and simulators. Both support iOS and Android. But they take fundamentally different approaches, and that difference matters enormously for React Native projects specifically. This article breaks down
Testing
Microservices break in integration. A provider team updates an API response format, the consumer team doesn't know for two weeks, and then production falls over. The standard answer — integration tests against a shared staging environment — is slow, flaky, and doesn't scale. Pact takes a different approach:
Testing
Network requests are at the core of every modern web application — and they're one of the biggest sources of test instability. A backend that's slow, unavailable, or returns unexpected data can fail tests that have nothing to do with the code you're testing. cy.
Testing
Cypress is one of the most developer-friendly testing frameworks available. It runs in the browser, shows you exactly what's happening in real time, and has an interactive UI that makes debugging failures fast. If you've never written a test before — or you're coming from
Testing
Cypress Component Testing lets you mount individual components in a real browser and test them in isolation — without starting your full application. This approach fills the gap between unit tests (jsdom, fast but imprecise) and E2E tests (full browser, accurate but slow and expensive to maintain). This guide covers setup
Testing
Getting Cypress tests to run reliably in CI is more than installing a package. Browser tests need headless browsers, system dependencies, shared state management, and enough parallelism to keep pipelines fast. This guide covers the complete setup: GitHub Actions workflow, browser installation, parallelization, artifacts, and reporting. Basic GitHub Actions Setup
Testing
A Cypress test suite that starts clean can become a maintenance nightmare if it grows without structure. Duplicated login flows, fragile selectors, and tests that share state all contribute to slow, flaky, hard-to-debug pipelines. This guide covers the patterns that keep Cypress test suites maintainable as they grow. Use data-cy
Testing
Mocks lie. They model your assumptions about a dependency, not the dependency itself. When a PostgreSQL query behaves differently across versions, when a Redis EXPIRE command has subtle timing behavior, or when Kafka consumer group rebalancing breaks your processing logic — mocks won't catch it. Testcontainers will. Testcontainers is
Testing
End-to-end tests are great for validating full user flows, but they're slow to write and slow to run when you're testing a single component. Playwright Component Testing lets you mount individual React, Vue, or Svelte components in a real browser — without standing up your full app
Testing
Playwright has quickly become the go-to tool for end-to-end browser testing. It's fast, reliable, and supports all major browsers out of the box. If you're new to Playwright, this guide walks you through everything you need to get your first tests running — from installation to writing
Testing
Playwright is famous for browser automation, but it ships with a capable HTTP client that lets you test REST APIs directly — no browser required. This makes it a powerful all-in-one tool: write your UI tests and API tests in the same framework, share authentication, and chain API calls with browser
Testing
Getting Playwright tests to run reliably in CI is one of the most common challenges teams face. Tests that pass locally fail in CI, pipelines are slow, and flaky results erode trust in the suite. This guide covers everything you need: GitHub Actions setup, Docker configuration, parallel sharding, retries, and