Support Glimmer

[marcoow]

ember-test-selectors might already work (more or less) well with Glimmer but I'm not sure anyone has checked yet does not currently work with Glimmer. There are some things we need to get done before we can officially support it:

• fix stripping of data-test-* attributes from templates
• setup testing with Glimmer
• don't patch Ember.Component when in a Glimmer app
• don't register Babel plugins when in a Glimmer app (as dataAttributeBindings doesn't exist in Glimmer anyway)

[Turbo87]

I think we should wait until Glimmer has a somewhat stable testing story before tackling this problem

[marcoow]

Actually this should be more or less unrelated to how Glimmer's testing story looks in detail though.

[marcoow]

I think the only way to setup proper testing with Glimmer (and Ember) would be to use ember-cli-addon-tests. I experimented with that a bit (see https://github.com/simplabs/ember-test-selectors/compare/ember-cli-addon-tests) and it should work (and it should also be possible to add a fixture app that uses the Glimmer blueprint so we could test against that). However, the massive downside is that we cannot actually tests the app as it is running in the browser but would have to make HTTP request and assert on the response body. That means we can only

• assert on whatever is in app.js; this basically means we have to assert on the Glimmer wire format (see e.g. https://github.com/simplabs/ember-test-selectors/compare/ember-cli-addon-tests#diff-60623ee8d9c9d63756a3abe26cb1c5bdR23) which is pretty bad as it will break whenever that changes and also requires all data-test- attributes we use in tests to be unique which makes the tests brittle
• we can add FastBoot as another dependency so that we can assert on the rendered HTML as opposed to the contents of app.js; this is obviously not great neither as we're adding another dependency which adds quite a bit of complexity; asserting on the rendered HTML though would make asserting as such much better (e.g. using something like https://www.npmjs.com/package/cheerio would even allow us to select attributes on specific elements etc.)

At the moment (and I couldn't see how that would change in the future) I don't see any other solutions than the above 2…

[Turbo87]

I think we should wait until Glimmer has a somewhat stable testing story before tackling this problem

☝️

if we need to make this addon so much more complicated to support glimmer then IMHO it might make more sense to create a glimmer-test-selectors project instead to reduce the overhead for Ember users.

[marcoow]

I don't think this situation will improve when Glimmer's testing story improves. After all, this is not a problem with Glimmer testing but with testing 2 very different Ember CLI projects. We'd be in the same situation if we needed to test with Ember CLI 1.x and and 2.x probably.

Forking glimmer-test-selectors also doesn't really seem like a viable solution. I think one of the key things we need to make sure in order for the Glimmer/Ember mid to long term plan to succeed is to not split the ecosystem (and community) in 2.

[Turbo87]

closing due to inactivity

if this ever becomes viable we can still reopen the issue...