test: e2e coverage

[hi-ogawa]

• relates to fix(remix-dev): fix linked sourcemap to enabled breakpoints for debugging remix-run/remix#2065

  • probably needs to upgrade remix packages

• vitest test: setup coverage (vitest) #57

• coverage for test-e2e

  • server test(e2e): setup coverage (server) #61
  • client test(e2e): setup coverage (client) #62
    • probably possible to use c8 report command for converting stopJSCoverage results into the same html
    • by default, remix emits separate source map file with sourceMappingURL=/build/_shared/chunk-GFQF5IRR.js.map, so c8 cannot actually use the sourcemap...

• merge coverage data from multiple sources (just throw all c8-compatible coverage json files to c8 report) test: merge coverage report #64

  • vitest
  • e2e server
  • e2e client

references

• https://playwright.dev/docs/api/class-coverage
• https://vitest.dev/guide/features.html#coverage
• https://github.com/bcoe/c8
• https://htmlpreview.github.io/

[hi-ogawa]

EDIT: solved in #61

We could pre-compile for e2e, but simply remix dev should work.

# precompile
npm run dev:prepare
NODE_ENV=development npx remix build --sourcemap
npx c8 "node_modules/.bin/remix-serve" build/remix/development/server/index.js

# usual dev
npx c8 "node_modules/.bin/remix" dev

It might be tricky to kill remix server specifically...