playwright-testing

Playwright E2E tests become less flaky and slow when you use auto-retrying web-first assertions like expect(locator) and resilient user-centric locators such as getByRole instead of manual DOM checks.

Mocking network responses in Playwright tests is best done using page.route() to intercept requests and page.waitForResponse() to coordinate real calls, preventing race conditions and ensuring deterministic network testing.

Migrating Cypress or Selenium tests to Playwright requires adopting web-first assertions, user-visible locators like getByRole, and structured suites with test.describe, hooks, and fixtures to ensure deterministic UI verification.

Playwright supports authenticated sessions in E2E testing through the storageState configuration option, which saves and reuses login states across tests to streamline authenticated UI verification.

Playwright tests break during UI refactors when relying on brittle CSS or XPath selectors instead of user-visible locators like getByRole, getByLabel, getByText, or getByTestId, which reduce breakage during structural changes.

Configuring Playwright for CI pipelines involves setting best-practice playwright.config.ts options for parallelization, CI-safe retries, tracing, and screenshots-on-failure to achieve reliable, production-oriented automated test execution.