System tests lack support for served_by

[s01ipsist]

What Ruby, Rails and RSpec versions are you using?

ruby 3.4.2 (2025-02-15 revision d2930f8e7a) +PRISM [aarch64-linux]
Rails 8.0.2
RSpec 3.13

• rspec-core 3.13.3
• rspec-expectations 3.13.3
• rspec-mocks 3.13.2
• rspec-rails 7.1.1
• rspec-support 3.13.2

Observed behaviour

https://api.rubyonrails.org/v8.0.2/classes/ActionDispatch/SystemTestCase.html
has a public helper method served_by introduced by
rails/rails@30506d2

This is used in the rails new devcontainer template for application_system_test_case.rb
https://github.com/rails/rails/blob/621aa49cefce3313fbc672e2f3681103da686a0e/railties/lib/rails/generators/rails/devcontainer/devcontainer_generator.rb#L163

If I use similar configuration within my rspec rails_helper.rb

  config.before(:each, type: :system, js: true) do
    if ENV['CAPYBARA_SERVER_PORT']
      served_by host: 'rails-app', port: ENV['CAPYBARA_SERVER_PORT']

      driven_by :selenium, using: :headless_chrome, screen_size: [1400, 1400], options: {
        browser: :remote,
        url: "http://#{ENV['SELENIUM_HOST']}:4444"
      }
    else
      driven_by :selenium, using: :headless_chrome, screen_size: [1400, 1400]
    end
  end

when I run rspec, I see a failure.

NoMethodError:
       undefined method 'served_by' for #<RSpec::ExampleGroups::MyExample:0x0000ffff74d3d398>

Expected behaviour

I would expect this method to be supported.

Proposed fix

An addition to lib/rspec/rails/example/system_example_group.rb of a method to pass through the call will allow this same config to pass.

        def served_by(**options)
          ::ActionDispatch::SystemTestCase.served_by(**options)
        end

[JonRowe]

Thanks!