As a developer I would like to have Karma evaluated for unit testing

thescientist13 commented 6 years ago

Type of Change

[x] New Feature Request
[ ] Documentation
[ ] Future Spec
[ ] Improvement / Suggestion
[ ] Bug
[ ] Other (please clarify below)

Summary

In chatting with community members in Polymer Slack, I had a productive discussion about the merits of using WCT, Jest and Karma. A few of my thoughts coming out of that chat:

Jest

would only use JSDOM, and so wouldn't actually be a real browser environment
pretty easy to get started with
well supported by the React community, but not React specific

WCT

Was made when tooling didn't well support browser based testing for things like Web Components
Required a lot of code that maybe is not needed as much now that Web Components interop well with the npm ecosystem (more intuitive developer experience
setting up tests requires a scaffold
had issues trying to use import in a test

Karma

Provides real browser based testing
Well supported by the AngularJS / Angular ecosystems (though not specific to those frameworks)
Supports "modern" developer workflows that supports "tdd" mode, code coverage, and has interop with webpack via karma-webpack
Configuration can be kind of a pain, but is pretty stable after that
Docs and community support are good, with releases still ongoing

Use Case

TBD - need to do some discovery first

Code Sample

TBD - need to do some discovery first

Pros / Cons

I think evaluating alternate options for testing is a good idea, especially if that option can provide a more ergonomic developer experience. I guess the question should be after this exercise is complete, is there a place for two solutions, or just one?

If Karma can provide a compelling / better experience, I say it might make sense to stick with one solution, just for support / documentation sake. Links to other docs would be good too.

thescientist13 commented 6 years ago

Links

thescientist13 commented 5 years ago

Got an implementation working in CEA https://github.com/ProjectEvergreen/create-evergreen-app/pull/14/

thescientist13 commented 5 years ago

Implemented with Karma in CEA. Open to anyone who wants to add this to the Todo App or the website.

Wiki updated here https://github.com/ProjectEvergreen/project-evergreen/wiki/Unit-Testing

ProjectEvergreen / project-evergreen