> **clerk-testing** — chapter 10 of 22 in [clerk/skills](https://skillsdocs.com/clerk/skills).
>
> Book (all chapters, one file): https://skillsdocs.com/clerk/skills.md
> Machine manifest: https://skillsdocs.com/clerk/skills/.well-known/agent-skills/index.json
> Install the book: `npx skills add clerk/skills`
> Upstream: https://github.com/clerk/skills/blob/main/skills/features/clerk-testing/SKILL.md @ `main`
> Raw bytes, no header: https://raw.githubusercontent.com/clerk/skills/main/skills/features/clerk-testing/SKILL.md
> Base for relative paths: https://raw.githubusercontent.com/clerk/skills/main/skills/features/clerk-testing/
> Licence: MIT — https://spdx.org/licenses/MIT.html
>
> Content © its authors, served unmodified. Takedown: https://github.com/kyleledbetter/skillsdocs/issues/new?labels=takedown&title=Takedown+request

<!-- Verbatim upstream SKILL.md follows, YAML frontmatter included. -->

---
name: clerk-testing
description: E2E testing for Clerk apps. Use with Playwright or Cypress for auth flow
  tests.
allowed-tools: WebFetch
license: MIT
metadata:
  author: clerk
  version: 1.2.0
compatibility: Requires CLERK_TESTING_TOKEN from Clerk dashboard
---

# Testing

## Decision Tree

| Framework | Documentation |
|-----------|---------------|
| Overview | https://clerk.com/docs/guides/development/testing/overview |
| Playwright | https://clerk.com/docs/guides/development/testing/playwright/overview |
| Cypress | https://clerk.com/docs/guides/development/testing/cypress/overview |

## Mental Model

Test auth = isolated session state. Each test needs fresh auth context.
- `clerkSetup()` initializes test environment
- `setupClerkTestingToken()` bypasses bot detection
- `storageState` persists auth between tests for speed

## Workflow

1. Identify test framework (Playwright or Cypress)
2. WebFetch the appropriate URL from decision tree above
3. Follow official setup instructions
4. Use `pk_test_*` and `sk_test_*` keys only

## Best Practices

- Use `setupClerkTestingToken()` before navigating to auth pages
- Use test API keys: `pk_test_xxx`, `sk_test_xxx`
- Save auth state with `storageState` for faster tests
- Use `page.waitForSelector('[data-clerk-component]')` for Clerk UI

## Anti-Patterns

| Pattern | Problem | Fix |
|---------|---------|-----|
| Production keys in tests | Security risk | Use `pk_test_*` keys |
| No `setupClerkTestingToken()` | Auth fails | Call before navigation |
| UI-based sign-in every test | Slow tests | Use `storageState` |

## Framework-Specific

**Playwright**: Use `globalSetup` for auth state
**Cypress**: Add `addClerkCommands({ Cypress, cy })` to support file

## See Also

- `clerk-setup` - Install Clerk before adding tests
- `clerk-nextjs-patterns` - Next.js patterns being tested
- [Demo Repo](https://github.com/clerk/clerk-playwright-nextjs/tree/main/e2e)