Add E2E testing, static analysis, continuous integration, dbreset with test user, Webpack cache busting

[lowlyocean]

• Please enable requirement for tests to succeed in order for Pull Request to be eligible for merge. [For users forking the boilerplate into GitLab, see this instead]

  • Before tests finish:
  • After tests succeed:

• .gitlab-ci.yml should be synchronized with .github/workflows/test.yml

• Recommend to add the missing tests to auth.spec.js

• Recommend to add spec.js test for each example module in the Dashboard (have provided inbox.spec.js as incomplete example)

• The .eslintrc.json is perhaps too lenient, but without these rules the existing codebase would have failed static analysis

• Probably worth to mention these new items in the Readme

Launching the auth.spec.js integration test using npx cypress open in order to view step-by-step results:

[lowlyocean]

Great! Please provide documentation for testing and webpack. It's still not clear for me how to use webpackchunks names.

Have added commit with updates to relevant documentation. The webpackChunkName is so that there are some recognizable names rather than numeric IDs (see red underline). Similarly [chunkhash] in webpack.common.js will force browser to download latest result of npm run dev if there are changes to corresponding source code (see green underline).