Add failing test for rendering turbo stream tags

[boardfish]

Summary

Replicates #1137 with the aim of supporting #1106.

Other Information

I'm not sure how to get this test to pass. I've tried using helpers.tag.turbo_stream and helpers.tag.template too, but neither seems to change the output.

Desired output (whitespace formatted for readability):

<turbo-stream action="update" target="area1">
    <template>
        <span>Hello, world!</span>
    </template>
</turbo-stream>

Actual output (whitespace formatted for readability):

<span>Hello, world!</span>
<turbo-stream action="update" target="area1">
    <template>
        &lt;span&gt;Hello, world!&lt;/span&gt;
    </template>
</turbo-stream>

Regardless of whether helpers.tag.turbo_stream or turbo_stream.update is used, what seems to be happening is that the block that is received is concatenated to the view as normal, then done again without being marked as html_safe within the tags.

Implementation of the turbo_stream tag builder starts around here.This is the object returned by calling turbo_stream against the view.

[boardfish]

Turbo doesn't support Rails < 6 - that seems to come right down to installation, since the builds are failing on dependencies. Was Appraisal ever added to our testing setup? I seem to remember seeing talk about it in another PR. I think that'd resolve this issue.

[Spone]

Turbo doesn't support Rails < 6 - that seems to come right down to installation, since the builds are failing on dependencies. Was Appraisal ever added to our testing setup? I seem to remember seeing talk about it in another PR. I think that'd resolve this issue.

Yes this is still a work in progress here: #1225

Feel free to review :)

[Spone]

@boardfish #1225 is merged, you can rebase and add turbo as a conditional dependency!

[boardfish]

@Spone I've tried to move things over to using Appraisal, but CI seems to be failing because it doesn't recognize turbo-rails as having been installed. I'm not having this problem locally when I run bundle exec appraisal install && bundle exec appraisal rake on a version that's compatible with turbo-rails (Ruby 3, rails-head). It doesn't look to me as though the tests are running via appraisal in CI, but I'm not confident around the source of the issue - would you be able to look into it?

[Spone]

It doesn't look to me as though the tests are running via appraisal in CI, but I'm not confident around the source of the issue - would you be able to look into it?

I guess we will have to wait for #1230 (see this comment)

[Spone]

We're now waiting for #1308 :)