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lcx9451lcx9451/dsh-engineering-skill-pack/skills/playwright-best-practices/SKILL.md

playwright-best-practices

Skill3 starsChanged 31 days agoMITView on GitHub

Use when writing Playwright tests, fixing flaky tests, debugging failures, implementing Page Object Model, configuring CI/CD, optimizing performance, mocking APIs, handling authentication or OAuth, testing accessibility (axe-core), file uploads/downloads, date/time mocking, WebSockets, geolocation, permissions, multi-tab/popup flows, mobile/responsive layouts, touch gestures, GraphQL, error handling, offline mode, multi-user collaboration, third-party services (payments, email verification), console error monitoring, global setup/teardown, test annotations (skip, fixme, slow), test tags (@smoke, @fast, @critical, filtering with --grep), project dependencies, security testing (XSS, CSRF, auth), performance budgets (Web Vitals, Lighthouse), iframes, component testing, canvas/WebGL, service workers/PWA, test coverage, i18n/localization, Electron apps, or browser extension testing. Covers E2E, component, API, visual, accessibility, security, Electron, and extension testing.

20 other projects use a version of this, 9 of them edited.

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Most recently taken up by

Used with

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The file

We split this skill into the rules it gives an agent

2 rules. 0 are common, 2 are distinctive, and 0 are very specific to this project.

  • 0

    Common

    Most of the 16 edited versions we read keep these.

  • 2

    Distinctive

    This author's own choices. Worth a look.

  • 0

    Very specific

    Tied to their project's names, files or tools. Probably skip.

  • Common
  • Distinctive
  • Very specific
  1. Distinctive:

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

    line 73
  2. Distinctive:

    After writing or modifying tests:

    line 295

“Common” is measured: kept by at least 6 in 10 of the 16 edited versions of this file we could read. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.
Files
SKILL.md

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

ActivityReference Files
Writing E2E teststest-suite-structure.md, locators.md, assertions-waiting.md
Writing component testscomponent-testing.md, test-suite-structure.md
Writing API testsapi-testing.md, test-suite-structure.md
Writing GraphQL testsgraphql-testing.md, api-testing.md
Writing visual regression testsvisual-regression.md, canvas-webgl.md
Structuring test code with POMpage-object-model.md, test-suite-structure.md
Setting up test data/fixturesfixtures-hooks.md, test-data.md
Handling authenticationauthentication.md, authentication-flows.md
Testing date/time featuresclock-mocking.md
Testing file upload/downloadfile-operations.md, file-upload-download.md
Testing forms/validationforms-validation.md
Testing drag and dropdrag-drop.md
Testing accessibilityaccessibility.md
Testing security (XSS, CSRF)security-testing.md
Using test annotationsannotations.md
Using test tagstest-tags.md
Testing iframesiframes.md
Testing canvas/WebGLcanvas-webgl.md
Internationalization (i18n)i18n.md
Testing Electron appselectron.md
Testing browser extensionsbrowser-extensions.md

Mobile & Responsive Testing

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

ActivityReference Files
Device emulationmobile-testing.md
Touch gestures (swipe, tap)mobile-testing.md
Viewport/breakpoint testingmobile-testing.md
Mobile-specific UImobile-testing.md, locators.md

Real-Time & Browser APIs

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

ActivityReference Files
WebSocket/real-time testingwebsockets.md
Geolocation mockingbrowser-apis.md
Permission handlingbrowser-apis.md
Clipboard testingbrowser-apis.md
Camera/microphone mockingbrowser-apis.md
Multi-tab/popup flowsmulti-context.md
OAuth popup handlingthird-party.md, multi-context.md

Debugging & Troubleshooting

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

ActivityReference Files
Debugging test failuresdebugging.md, assertions-waiting.md
Fixing flaky testsflaky-tests.md, debugging.md, assertions-waiting.md
Debugging flaky parallel runsflaky-tests.md, performance.md, fixtures-hooks.md
Ensuring test isolation / avoiding state leakflaky-tests.md, fixtures-hooks.md, performance.md
Fixing selector issueslocators.md, debugging.md
Investigating timeout issuesassertions-waiting.md, debugging.md
Using trace viewerdebugging.md
Debugging race conditionsflaky-tests.md, debugging.md, assertions-waiting.md
Debugging console/JS errorsconsole-errors.md, debugging.md

Error & Edge Case Testing

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

ActivityReference Files
Error boundary testingerror-testing.md
Network failure simulationerror-testing.md, network-advanced.md
Offline mode testingerror-testing.md, service-workers.md
Service worker testingservice-workers.md
Loading state testingerror-testing.md
Form validation testingerror-testing.md

Multi-User & Collaboration Testing

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

ActivityReference Files
Multiple users in one testmulti-user.md
Real-time collaborationmulti-user.md, websockets.md
Role-based access testingmulti-user.md
Concurrent action testingmulti-user.md

Architecture Decisions

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

ActivityReference Files
POM vs fixtures decisionpom-vs-fixtures.md
Test type selectiontest-architecture.md
Mock vs real serviceswhen-to-mock.md
Test suite structuretest-suite-structure.md

Framework-Specific Testing

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

ActivityReference Files
Testing React appsreact.md
Testing Angular appsangular.md
Testing Vue/Nuxt appsvue.md
Testing Next.js appsnextjs.md

Refactoring & Maintenance

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

ActivityReference Files
Refactoring to Page Object Modelpage-object-model.md, test-suite-structure.md
Improving test organizationtest-suite-structure.md, page-object-model.md
Extracting common setup/teardownfixtures-hooks.md
Replacing brittle selectorslocators.md
Removing explicit waitsassertions-waiting.md
Creating test data factoriestest-data.md
Configuration setupconfiguration.md

Infrastructure & Configuration

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

ActivityReference Files
Configuring Playwright projectconfiguration.md, projects-dependencies.md
Setting up CI/CD pipelinesci-cd.md, github-actions.md
GitHub Actions setupgithub-actions.md
GitLab CI setupgitlab.md
Other CI providersother-providers.md
Docker/container setupdocker.md
Global setup & teardownglobal-setup.md
Project dependenciesprojects-dependencies.md
Optimizing test performanceperformance.md, test-suite-structure.md
Configuring parallel executionparallel-sharding.md, performance.md
Isolating test data between workersfixtures-hooks.md, performance.md
Test coveragetest-coverage.md
Test reporting/artifactsreporting.md

Advanced Patterns

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

ActivityReference Files
Mocking API responsestest-suite-structure.md, network-advanced.md
Network interceptionnetwork-advanced.md, assertions-waiting.md
GraphQL mockingnetwork-advanced.md
HAR recording/playbacknetwork-advanced.md
Custom fixturesfixtures-hooks.md
Advanced waiting strategiesassertions-waiting.md
OAuth/SSO mockingthird-party.md, multi-context.md
Payment gateway mockingthird-party.md
Email/SMS verification mockingthird-party.md
Failing on console errorsconsole-errors.md
Security testing (XSS, CSRF)security-testing.md
Performance budgets & Web Vitalsperformance-testing.md
Lighthouse integrationperformance-testing.md
Test annotations (skip, fixme)annotations.md
Test tags (@smoke, @fast)test-tags.md
Test steps for reportingannotations.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:

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

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