playwright-best-practices

par currents-dev

Utiliser lors de l'écriture de tests Playwright, de la correction de tests instables, du débogage d'échecs, de l'implémentation du modèle Page Object, de la configuration CI/CD, de l'optimisation des performances, du mock d'API, de la gestion de l'authentification ou OAuth, des tests d'accessibilité (axe-core), des téléchargements/uploads de fichiers, du mock de date/heure, des WebSockets, de la géolocalisation, des permissions, des flux multi-onglets/popups, des dispositions mobiles/responsives, des gestes tactiles, de GraphQL, de la gestion des erreurs, du mode hors ligne, de la collaboration multi-utilisateurs, des services tiers (paiements, vérification par e-mail),...

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Playwright Best Practices

This skill provides comprehensive guidance for all aspects of Playwright test development, from writing new tests to debugging and maintaining existing test suites.

Activity-Based Reference Guide

Consult these references based on what you're doing:

Writing New Tests

When to use: Creating new test files, writing test cases, implementing test scenarios

Activity	Reference Files
Writing E2E tests	test-suite-structure.md, locators.md, assertions-waiting.md
Writing component tests	component-testing.md, test-suite-structure.md
Writing API tests	api-testing.md, test-suite-structure.md
Writing GraphQL tests	graphql-testing.md, api-testing.md
Writing visual regression tests	visual-regression.md, canvas-webgl.md
Structuring test code with POM	page-object-model.md, test-suite-structure.md
Setting up test data/fixtures	fixtures-hooks.md, test-data.md
Handling authentication	authentication.md, authentication-flows.md
Testing date/time features	clock-mocking.md
Testing file upload/download	file-operations.md, file-upload-download.md
Testing forms/validation	forms-validation.md
Testing drag and drop	drag-drop.md
Testing accessibility	accessibility.md
Testing security (XSS, CSRF)	security-testing.md
Using test annotations	annotations.md
Using test tags	test-tags.md
Testing iframes	iframes.md
Testing canvas/WebGL	canvas-webgl.md
Internationalization (i18n)	i18n.md
Testing Electron apps	electron.md
Testing browser extensions	browser-extensions.md

Mobile & Responsive Testing

When to use: Testing mobile devices, touch interactions, responsive layouts

Activity	Reference Files
Device emulation	mobile-testing.md
Touch gestures (swipe, tap)	mobile-testing.md
Viewport/breakpoint testing	mobile-testing.md
Mobile-specific UI	mobile-testing.md, locators.md

Real-Time & Browser APIs

When to use: Testing WebSockets, geolocation, permissions, multi-tab flows

Activity	Reference Files
WebSocket/real-time testing	websockets.md
Geolocation mocking	browser-apis.md
Permission handling	browser-apis.md
Clipboard testing	browser-apis.md
Camera/microphone mocking	browser-apis.md
Multi-tab/popup flows	multi-context.md
OAuth popup handling	third-party.md, multi-context.md

Debugging & Troubleshooting

When to use: Test failures, element not found, timeouts, unexpected behavior

Activity	Reference Files
Debugging test failures	debugging.md, assertions-waiting.md
Fixing flaky tests	flaky-tests.md, debugging.md, assertions-waiting.md
Debugging flaky parallel runs	flaky-tests.md, performance.md, fixtures-hooks.md
Ensuring test isolation / avoiding state leak	flaky-tests.md, fixtures-hooks.md, performance.md
Fixing selector issues	locators.md, debugging.md
Investigating timeout issues	assertions-waiting.md, debugging.md
Using trace viewer	debugging.md
Debugging race conditions	flaky-tests.md, debugging.md, assertions-waiting.md
Debugging console/JS errors	console-errors.md, debugging.md

Error & Edge Case Testing

When to use: Testing error states, offline mode, network failures, validation

Activity	Reference Files
Error boundary testing	error-testing.md
Network failure simulation	error-testing.md, network-advanced.md
Offline mode testing	error-testing.md, service-workers.md
Service worker testing	service-workers.md
Loading state testing	error-testing.md
Form validation testing	error-testing.md

Multi-User & Collaboration Testing

When to use: Testing features involving multiple users, roles, or real-time collaboration

Activity	Reference Files
Multiple users in one test	multi-user.md
Real-time collaboration	multi-user.md, websockets.md
Role-based access testing	multi-user.md
Concurrent action testing	multi-user.md

Architecture Decisions

When to use: Choosing test patterns, deciding between approaches, planning test architecture

Activity	Reference Files
POM vs fixtures decision	pom-vs-fixtures.md
Test type selection	test-architecture.md
Mock vs real services	when-to-mock.md
Test suite structure	test-suite-structure.md

Framework-Specific Testing

When to use: Testing React, Angular, Vue, or Next.js applications

Activity	Reference Files
Testing React apps	react.md
Testing Angular apps	angular.md
Testing Vue/Nuxt apps	vue.md
Testing Next.js apps	nextjs.md

Refactoring & Maintenance

When to use: Improving existing tests, code review, reducing duplication

Activity	Reference Files
Refactoring to Page Object Model	page-object-model.md, test-suite-structure.md
Improving test organization	test-suite-structure.md, page-object-model.md
Extracting common setup/teardown	fixtures-hooks.md
Replacing brittle selectors	locators.md
Removing explicit waits	assertions-waiting.md
Creating test data factories	test-data.md
Configuration setup	configuration.md

Infrastructure & Configuration

When to use: Setting up projects, configuring CI/CD, optimizing performance

Activity	Reference Files
Configuring Playwright project	configuration.md, projects-dependencies.md
Setting up CI/CD pipelines	ci-cd.md, github-actions.md
GitHub Actions setup	github-actions.md
GitLab CI setup	gitlab.md
Other CI providers	other-providers.md
Docker/container setup	docker.md
Global setup & teardown	global-setup.md
Project dependencies	projects-dependencies.md
Optimizing test performance	performance.md, test-suite-structure.md
Configuring parallel execution	parallel-sharding.md, performance.md
Isolating test data between workers	fixtures-hooks.md, performance.md
Test coverage	test-coverage.md
Test reporting/artifacts	reporting.md

Advanced Patterns

When to use: Complex scenarios, API mocking, network interception

Activity	Reference Files
Mocking API responses	test-suite-structure.md, network-advanced.md
Network interception	network-advanced.md, assertions-waiting.md
GraphQL mocking	network-advanced.md
HAR recording/playback	network-advanced.md
Custom fixtures	fixtures-hooks.md
Advanced waiting strategies	assertions-waiting.md
OAuth/SSO mocking	third-party.md, multi-context.md
Payment gateway mocking	third-party.md
Email/SMS verification mocking	third-party.md
Failing on console errors	console-errors.md
Security testing (XSS, CSRF)	security-testing.md
Performance budgets & Web Vitals	performance-testing.md
Lighthouse integration	performance-testing.md
Test annotations (skip, fixme)	annotations.md
Test tags (@smoke, @fast)	test-tags.md
Test steps for reporting	annotations.md

Quick Decision Tree

What are you doing?
│
├─ Writing a new test?
│  ├─ E2E test → core/test-suite-structure.md, core/locators.md, core/assertions-waiting.md
│  ├─ Component test → testing-patterns/component-testing.md
│  ├─ API test → testing-patterns/api-testing.md, core/test-suite-structure.md
│  ├─ GraphQL test → testing-patterns/graphql-testing.md
│  ├─ Visual regression → testing-patterns/visual-regression.md
│  ├─ Visual/canvas test → testing-patterns/canvas-webgl.md, core/test-suite-structure.md
│  ├─ Accessibility test → testing-patterns/accessibility.md
│  ├─ Mobile/responsive test → advanced/mobile-testing.md
│  ├─ i18n/locale test → testing-patterns/i18n.md
│  ├─ Electron app test → testing-patterns/electron.md
│  ├─ Browser extension test → testing-patterns/browser-extensions.md
│  ├─ Multi-user test → advanced/multi-user.md
│  ├─ Form validation test → testing-patterns/forms-validation.md
│  └─ Drag and drop test → testing-patterns/drag-drop.md
│
├─ Testing specific features?
│  ├─ File upload/download → testing-patterns/file-operations.md, testing-patterns/file-upload-download.md
│  ├─ Date/time dependent → advanced/clock-mocking.md
│  ├─ WebSocket/real-time → browser-apis/websockets.md
│  ├─ Geolocation/permissions → browser-apis/browser-apis.md
│  ├─ OAuth/SSO mocking → advanced/third-party.md, advanced/multi-context.md
│  ├─ Payments/email/SMS → advanced/third-party.md
│  ├─ iFrames → browser-apis/iframes.md
│  ├─ Canvas/WebGL/charts → testing-patterns/canvas-webgl.md
│  ├─ Service workers/PWA → browser-apis/service-workers.md
│  ├─ i18n/localization → testing-patterns/i18n.md
│  ├─ Security (XSS, CSRF) → testing-patterns/security-testing.md
│  └─ Performance/Web Vitals → testing-patterns/performance-testing.md
│
├─ Architecture decisions?
│  ├─ POM vs fixtures → architecture/pom-vs-fixtures.md
│  ├─ Test type selection → architecture/test-architecture.md
│  ├─ Mock vs real services → architecture/when-to-mock.md
│  └─ Test suite structure → core/test-suite-structure.md
│
├─ Framework-specific testing?
│  ├─ React app → frameworks/react.md
│  ├─ Angular app → frameworks/angular.md
│  ├─ Vue/Nuxt app → frameworks/vue.md
│  └─ Next.js app → frameworks/nextjs.md
│
├─ Authentication testing?
│  ├─ Basic auth patterns → advanced/authentication.md
│  └─ Complex flows (MFA, reset) → advanced/authentication-flows.md
│
├─ Test is failing/flaky?
│  ├─ Flaky test investigation → debugging/flaky-tests.md
│  ├─ Element not found → core/locators.md, debugging/debugging.md
│  ├─ Timeout issues → core/assertions-waiting.md, debugging/debugging.md
│  ├─ Race conditions → debugging/flaky-tests.md, debugging/debugging.md
│  ├─ Flaky only with multiple workers → debugging/flaky-tests.md, infrastructure-ci-cd/performance.md
│  ├─ State leak / isolation → debugging/flaky-tests.md, core/fixtures-hooks.md
│  ├─ Console/JS errors → debugging/console-errors.md, debugging/debugging.md
│  └─ General debugging → debugging/debugging.md
│
├─ Testing error scenarios?
│  ├─ Network failures → debugging/error-testing.md, advanced/network-advanced.md
│  ├─ Offline (unexpected) → debugging/error-testing.md
│  ├─ Offline-first/PWA → browser-apis/service-workers.md
│  ├─ Error boundaries → debugging/error-testing.md
│  └─ Form validation → testing-patterns/forms-validation.md, debugging/error-testing.md
│
├─ Refactoring existing code?
│  ├─ Implementing POM → core/page-object-model.md
│  ├─ Improving selectors → core/locators.md
│  ├─ Extracting fixtures → core/fixtures-hooks.md
│  ├─ Creating data factories → core/test-data.md
│  └─ Configuration setup → core/configuration.md
│
├─ Setting up infrastructure?
│  ├─ CI/CD → infrastructure-ci-cd/ci-cd.md
│  ├─ GitHub Actions → infrastructure-ci-cd/github-actions.md
│  ├─ GitLab CI → infrastructure-ci-cd/gitlab.md
│  ├─ Other CI providers → infrastructure-ci-cd/other-providers.md
│  ├─ Docker/containers → infrastructure-ci-cd/docker.md
│  ├─ Sharding/parallel → infrastructure-ci-cd/parallel-sharding.md
│  ├─ Reporting/artifacts → infrastructure-ci-cd/reporting.md
│  ├─ Global setup/teardown → core/global-setup.md
│  ├─ Project dependencies → core/projects-dependencies.md
│  ├─ Test performance → infrastructure-ci-cd/performance.md
│  ├─ Test coverage → infrastructure-ci-cd/test-coverage.md
│  └─ Project config → core/configuration.md, core/projects-dependencies.md
│
├─ Organizing tests?
│  ├─ Skip/fixme/slow tests → core/annotations.md
│  ├─ Test tags (@smoke, @fast) → core/test-tags.md
│  ├─ Filtering tests (--grep) → core/test-tags.md
│  ├─ Test steps → core/annotations.md
│  └─ Conditional execution → core/annotations.md
│
└─ Running subset of tests?
   ├─ By tag (@smoke, @critical) → core/test-tags.md
   ├─ Exclude slow/flaky tests → core/test-tags.md
   ├─ PR vs nightly tests → core/test-tags.md, infrastructure-ci-cd/ci-cd.md
   └─ Project-specific filtering → core/test-tags.md, core/configuration.md

Test Validation Loop

After writing or modifying tests:

Run tests: npx playwright test --reporter=list
If tests fail:
- Review error output and trace (npx playwright show-trace)
- Fix locators, waits, or assertions
- Re-run tests
Only proceed when all tests pass
Run multiple times for critical tests: npx playwright test --repeat-each=5