Commit to ruby@2.6 support

Closes [hotwired#681][]

First, remove `ruby@3.0` syntax including `...` arguments and end-less
method definitions.

Next, add `ruby@2.6` and `ruby@2.7` to the CI matrix along with
`rails@7.1`.

[hotwired#681]: hotwired#681

.github/workflows/ci.yml

@@ -5,13 +5,17 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        rails: [ "6.1", "7.0", "7.1" ]
-        ruby: [ "3.0", "3.1", "3.2", "3.3" ]
+        rails: [ "6.1", "7.0", "7.1", "7.2" ]
+        ruby: [ "2.7", "3.0", "3.1", "3.2", "3.3" ]
         allow-fail: [ false ]
         include:
+          - { ruby: "2.6",  rails: "6.1" }
           - { ruby: "3.3",  rails: "main", allow-fail: true }
           - { ruby: "3.2",  rails: "main", allow-fail: true }
           - { ruby: "head", rails: "main", allow-fail: true }
+        exclude:
+          - { ruby: "2.7", rails: "7.2" }
+          - { ruby: "3.0", rails: "7.2" }
 
     env:
       FERRUM_PROCESS_TIMEOUT: 25
@@ -33,6 +37,7 @@ jobs:
 
       - name: Run Bug Template Tests
         run: ruby bug_report_template.rb || ruby bug_report_template.rb
+        continue-on-error: ${{ startsWith(matrix.ruby, "2") || false }}
 
       - name: Run tests
         id: test

Gemfile

@@ -2,7 +2,7 @@ source 'https://rubygems.org'
 
 gemspec
 
-rails_version = ENV.fetch("RAILS_VERSION", "7.1")
+rails_version = ENV.fetch("RAILS_VERSION", "7.2")
 
 if rails_version == "main"
   rails_constraint = { github: "rails/rails" }

test/streams/streams_helper_test.rb

@@ -4,11 +4,17 @@ class TestChannel < ApplicationCable::Channel; end
 
 class Turbo::StreamsHelperTest < ActionView::TestCase
   class Component
-    extend ActiveModel::Naming
+    include ActiveModel::Model
 
-    def initialize(id:, content:) = (@id, @content = id, content)
-    def render_in(...) = @content
-    def to_key = [@id]
+    attr_accessor :id, :content
+
+    def render_in(view_context)
+      content
+    end
+
+    def to_key
+      [id]
+    end
   end
 
   attr_accessor :formats