refactor(webapp): fix coverage

[ulfgebhardt]

🍰 Pullrequest

Fixed coverage reporting. The coverage report is now properly generated using @vue/vue2-jest instead of vue-jest.

Additionally this defines coverageProvider: "v8" to get proper highlighting in the coverage html files.
See: https://jestjs.io/docs/configuration#coverageprovider-string

Apparently template and script elements are included in the coverage threshold and this leads to a high coverage value. Still this is an improvement since coverage now is correct(apparently was before as well) and is debugable via the html.

Issues

• relates to Coverage report is complaining about non existing lines of code vuejs/vue-jest#522
• relates to Coverage report incorrect vuejs/vue-jest#480
• relates to test utils coverage report broken for Vue2 projects vuejs/vue-test-utils#1977

Todo

• Investigate if we can use babel as coverage provider to get more meaningful coverage values. -> not working at the moment

[Mogge]

yarn test pages/search/search-results.spec.js

yarn test pages/post/edit/_id.spec.js

Throw warnings. Please fix this

fixed