Turbo::StreamsChannel can set targets attribute on stream tag

[ceritium]

Background:

• Allow a single stream response to update multiple elements turbo#113 allowed for multiple targets in turbo frame streams.
• Turbo::Streams::TagBuilder can set targets attribute on stream tag #194 implemented it for Turbo::Streams::TagBuilder

This attempts to expose the feature on Turbo::StreamsChannel methods.

[dhh]

👍. Can you add some tests for this as well?

[ceritium]

Hi @dhh, sure I can do it.

I have three different approaches in mind:

• Just duplicate some of the tests cases with the targets argument.
• Add another assertion in some tests cases with the targets argument.
• Wrap some tests cases with a method to iterate over target and targets arguments.

Something like:

    with_target_options do |opts|
      assert_broadcast_on "stream", turbo_stream_action_tag("replace", template: "<p>hello!</p>", **opts) do
        Turbo::StreamsChannel.broadcast_replace_to "stream", partial: "messages/message", locals: { message: "hello!" }, **opts
      end
    end

I think covering the uses cases that match with broadcasting (remove/replace/update/append/prepend) (now/later) is enogh.

What do you think?

[dhh]

Think just adding another assert with the targets argument is fine. Doesn't need to be too clever!