rails--rails/railties/test/application/rake/restart_test.rb

require "isolation/abstract_unit"

module ApplicationTests
  module RakeTests
    class RakeRestartTest < ActiveSupport::TestCase
      include ActiveSupport::Testing::Isolation

      def setup
        build_app
      end

      def teardown
        teardown_app
      end

      test "rails restart touches tmp/restart.txt" do
        Dir.chdir(app_path) do
          `bin/rails restart`
          assert File.exist?("tmp/restart.txt")

          prev_mtime = File.mtime("tmp/restart.txt")
          sleep(1)
          `bin/rails restart`
          curr_mtime = File.mtime("tmp/restart.txt")
          assert_not_equal prev_mtime, curr_mtime
        end
      end

      test "rails restart should work even if tmp folder does not exist" do
        Dir.chdir(app_path) do
          FileUtils.remove_dir("tmp")
          `bin/rails restart`
          assert File.exist?("tmp/restart.txt")
        end
      end

      test "rails restart removes server.pid also" do
        Dir.chdir(app_path) do
          FileUtils.mkdir_p("tmp/pids")
          FileUtils.touch("tmp/pids/server.pid")
          `bin/rails restart`
          assert_not File.exist?("tmp/pids/server.pid")
        end
      end
    end
  end
end