rails/railties/test/application/server_test.rb

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require "isolation/abstract_unit"
require "rails/command"
require "rails/commands/server/server_command"
module ApplicationTests
class ServerTest < ActiveSupport::TestCase
include ActiveSupport::Testing::Isolation
def setup
build_app
end
def teardown
teardown_app
end
test "deprecate support of older `config.ru`" do
remove_file "config.ru"
app_file "config.ru", <<-RUBY
require_relative 'config/environment'
run AppTemplate::Application
RUBY
server = Rails::Server.new(config: "#{app_path}/config.ru")
server.app
log = File.read(Rails.application.config.paths["log"].first)
assert_match(/DEPRECATION WARNING: Use `Rails::Application` subclass to start the server is deprecated/, log)
end
end
end