rails--rails/railties/test/application/load_test.rb

require "isolation/abstract_unit"
require "rails"
require 'action_dispatch'

module ApplicationTests
  class LoadTest < Test::Unit::TestCase
    include ActiveSupport::Testing::Isolation

    def rackup
      ActionDispatch::Utils.parse_config("#{app_path}/config.ru")
    end

    def setup
      build_app
    end

    test "rails app is present" do
      assert File.exist?(app_path("config"))
    end

    test "config.ru can be racked up" do
      @app = rackup
      assert_welcome get("/")
    end

    test "Rails.application is available after config.ru has been racked up" do
      rackup
      assert Rails.application.is_a?(Rails::Application)
    end

    test "class_evaling config/environment.rb returns the application object" do
      assert Rails::Application.load("#{app_path}/config/environment.rb").is_a?(Rails::Application)
    end

    test "the config object is available on the application object" do
      rackup
      assert_equal 'UTC', Rails.application.config.time_zone
    end
  end
end