Running `npx playwright test` results in a cryptic error message that says to check `--help` for more information.
I started to rewrite it, but I think instead it would be much nicer if we just treated `npx playwright test` as an alias for `npx playwright test -c .`. There is a comment in the code that worries this will be slow because it will scan the world. However we need to support this case anyway for the tests-next-to-code pattern.
It looks like this should be fast because we ignore node_modules/.gitignore entries. If this is still too slow we should make it faster. If we can't make it faster we should throw a more specific error telling the user how to make it faster.
- Source now lives at `src/test`.
- Former folio tests live at `tests/playwright-test`.
- We use `src/test/internal.ts` that exposes base test without
Playwright fixtures for most tests (to avoid modifications for now).
- Test types live in `types/testFoo.d.ts`.
- Stable test runner is installed to `tests/config/test-runner` during `npm install`.
- All deps including test-only are now listed in `package.json`.
Non-test deps must also be listed in `build_package.js` to get included.
