Running Automated Tests Against Vercel Preview URLs

Automated testing of Vercel preview deployments requires capturing the commit-specific preview URL from GitHub’s successful `deployment_status` event for the `Preview` environment, rather than using a branch URL that may change after later pushes. Deployment Protection can block CI tools and browser tests with a login screen, so automation must use Vercel’s `VERCEL_AUTOMATION_BYPASS_SECRET` through the `x-vercel-protection-bypass` header; browser-based, multi-page tests should also send `x-vercel-set-bypass-cookie: true` to preserve authorization across subsequent requests. A GitHub Actions workflow can store `deployment_status.target_url` as an environment variable and run Playwright or another testing tool against that exact deployment. The text also presents TestMu AI’s Kane CLI as a spec-free alternative for plain-language smoke tests using the same bypass header, while suggesting Playwright for stable, well-defined test flows. For broader testing, persistent custom environments such as staging or QA can support longer regression runs, whereas per-commit previews are suited to fast checks on each change.

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