playwright

To write reliable Playwright e2e tests for Next.js, apply structured rules covering test architecture, stable selectors, and deterministic waiting. Best practices ensure reliability across App Router, Server Components, and hydration behaviors to reduce flaky tests and accelerate CI feedback.

Playwright tests fail during Next.js hydration when selectors trigger before client-side rendering completes. Enforcing deterministic assertions and waiting for hydration-specific state ensures tests interact with fully rendered components, preventing flaky failures in CI pipelines.

Handling authentication state in Playwright tests for Next.js involves reusing login sessions across test suites. Best practices guide configuring authentication and state management to maintain reliable, deterministic tests without redundant login overhead.

Playwright mocking can test Next.js client-server interactions by intercepting network requests. Best practices guide mocking strategies that ensure deterministic test execution and validate application behavior without relying on live backend dependencies.

Running Playwright tests in Next.js CI pipelines faces limitations with flaky execution and slow feedback. Best practices address these constraints by enforcing CI-ready configurations, performance optimizations, and debugging strategies to maintain stable, deterministic test runs.