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playwright-best-practices

Use when writing or modifying Playwright tests (.spec.ts, .test.ts with @playwright/test imports).

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aiskillstore/marketplace
Works withPlaywright
See how to install

Files included (3)

  • SKILL.md2.7 KB
  • playwright-patterns.md11.6 KB
  • skill-report.json58.5 KB

SKILL.md (original)

Review the instructions the agent will receive before you install.

Playwright Best Practices

CLI Context: Prevent Context Overflow

When running Playwright tests from Claude Code or any CLI agent, always use minimal reporters to prevent verbose output from consuming the context window.

Use --reporter=line or --reporter=dot for CLI test runs. Configure playwright.config.ts to default to minimal reporters when CI or CLAUDE env vars are set — see playwright-patterns.md for the config snippet.

Locator Priority (Most to Least Resilient)

Always prefer user-facing attributes:

  1. page.getByRole('button', { name: 'Submit' }) — accessibility roles
  2. page.getByLabel('Email') — form control labels
  3. page.getByPlaceholder('Search...') — input placeholders
  4. page.getByText('Welcome') — visible text (non-interactive)
  5. page.getByAltText('Logo') — image alt text
  6. page.getByTitle('Settings') — title attributes
  7. page.getByTestId('submit-btn') — explicit test contracts
  8. CSS/XPath — last resort, avoid

Core Rules

  • Web-first assertions: always await expect(locator).toBeVisible(), never expect(await locator.isVisible()).toBe(true) — web-first matchers auto-wait and retry
  • Test isolation: each test creates its own data; never share state between tests
  • Auth state reuse: save authenticated state via setup project + storageState; never log in via UI in every test
  • Fixtures over beforeEach: fixtures encapsulate setup + teardown, run on-demand, and compose

Anti-Patterns

  • page.waitForTimeout(ms) — use auto-waiting locators instead
  • page.locator('.class') — use role/label/testid
  • XPath selectors — fragile, use user-facing attributes
  • Shared state between tests — each test creates own data
  • UI login in every test — use setup project + storageState
  • Manual assertions without await — use web-first assertions
  • Hardcoded waits — rely on Playwright's auto-waiting
  • Default reporter in CI/agent — use --reporter=line or --reporter=dot

Checklist

  • Locators use role/label/testid, not CSS classes or XPath
  • All assertions use await expect() web-first matchers
  • Page objects define locators in constructor
  • No page.waitForTimeout() — use auto-waiting
  • Tests isolated — no shared state
  • Auth state reused via setup project
  • Network mocks set up before navigation
  • Test data created per-test or via fixtures
  • Debug logging added for complex flows
  • Minimal reporter (line/dot) used in CI/agent contexts

See playwright-patterns.md for Page Object Model, fixtures, network mocking, and configuration examples.

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