[hirasso]

Closes #255

npm test validated 0 pages and always passed. This fixes the validator run and adds browser smoke tests.

Changes

• Update @swup/cli to 5.0.5: swup validate now reads the sitemap (61/61 pages validated) and fails if it finds no pages. The existing animation checks are kept.
• Fix test:serve: --silent _site made _site the value of --silent, so the test server served the repo root instead of the built site
• Add Playwright smoke tests (tests/smoke.spec.mjs, run via npm run test:e2e, part of npm test):
  • initial load
  • swup navigation without a full reload
  • back navigation
  • switching to each theme (Fade, Overlay, Slide), then navigating with it
  • every test fails on uncaught JS errors
  • third-party requests (analytics) are blocked to keep tests hermetic
• Rename swup.config.js to swup.config.mjs to silence Node's MODULE_TYPELESS_PACKAGE_JSON warning
• Add @swup/prettier-config as a devDependency (it was only installed via @swup/plugin)
• Flaky tests fixed in the cli

Checks

• The PR is submitted to the main branch
• All tests are passing (npm run test)
• New or updated tests are included

[daun]

🍇

[hirasso]

Putting this on hold until swup/cli#68 is merged and released....

[hirasso]

Flaky tests are fixed upstream in swup/cli 5.0.5! Ready to finally merge this. That Validate swup.js.org in CI is not really required but good to have anyways.