1 files changed, 66 insertions, 0 deletions
diff --git a/railties/test/application/server_test.rb b/railties/test/application/server_test.rb
new file mode 100644
index 0000000000..ab9e910aed
--- /dev/null
+++ b/railties/test/application/server_test.rb
@@ -0,0 +1,66 @@
+# frozen_string_literal: true
+
+require "isolation/abstract_unit"
+require "console_helpers"
+require "rails/command"
+require "rails/commands/server/server_command"
+
+module ApplicationTests
+  class ServerTest < ActiveSupport::TestCase
+    include ActiveSupport::Testing::Isolation
+    include ConsoleHelpers
+
+    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: Using `Rails::Application` subclass to start the server is deprecated/, log)
+    end
+
+    test "restart rails server with custom pid file path" do
+      skip "PTY unavailable" unless available_pty?
+
+      File.open("#{app_path}/config/boot.rb", "w") do |f|
+        f.puts "ENV['BUNDLE_GEMFILE'] = '#{Bundler.default_gemfile}'"
+        f.puts "require 'bundler/setup'"
+      end
+
+      primary, replica = PTY.open
+      pid = nil
+
+      begin
+        pid = Process.spawn("#{app_path}/bin/rails server -P tmp/dummy.pid", in: replica, out: replica, err: replica)
+        assert_output("Listening", primary)
+
+        rails("restart")
+
+        assert_output("Restarting", primary)
+        assert_output("Inherited", primary)
+      ensure
+        kill(pid) if pid
+      end
+    end
+
+    private
+      def kill(pid)
+        Process.kill("TERM", pid)
+        Process.wait(pid)
+      rescue Errno::ESRCH
+      end
+  end
+end