rails--rails/actionpack/test/dispatch/mount_test.rb

require "abstract_unit"
require "rails/engine"

class TestRoutingMount < ActionDispatch::IntegrationTest
  Router = ActionDispatch::Routing::RouteSet.new

  class AppWithRoutes < Rails::Engine
    def self.routes
      @routes ||= ActionDispatch::Routing::RouteSet.new
    end
  end

  # Test for mounting apps that respond to routes, but aren't Rails-like apps.
  class SinatraLikeApp
    def self.routes; Object.new; end

    def self.call(env)
      [200, { "Content-Type" => "text/html" }, ["OK"]]
    end
  end

  Router.draw do
    SprocketsApp = lambda { |env|
      [200, { "Content-Type" => "text/html" }, ["#{env["SCRIPT_NAME"]} -- #{env["PATH_INFO"]}"]]
    }

    mount SprocketsApp, at: "/sprockets"
    mount SprocketsApp => "/shorthand"

    mount SinatraLikeApp, at: "/fakeengine", as: :fake
    mount SinatraLikeApp, at: "/getfake", via: :get

    scope "/its_a" do
      mount SprocketsApp, at: "/sprocket"
    end

    resources :users do
      mount AppWithRoutes, at: "/fakeengine", as: :fake_mounted_at_resource
    end

    mount SprocketsApp, at: "/", via: :get
  end

  APP = RoutedRackApp.new Router
  def app
    APP
  end

  def test_app_name_is_properly_generated_when_engine_is_mounted_in_resources
    assert Router.mounted_helpers.method_defined?(:user_fake_mounted_at_resource),
          "A mounted helper should be defined with a parent's prefix"
    assert Router.named_routes.key?(:user_fake_mounted_at_resource),
          "A named route should be defined with a parent's prefix"
  end

  def test_mounting_at_root_path
    get "/omg"
    assert_equal " -- /omg", response.body
  end

  def test_mounting_sets_script_name
    get "/sprockets/omg"
    assert_equal "/sprockets -- /omg", response.body
  end

  def test_mounting_works_with_nested_script_name
    get "/foo/sprockets/omg", headers: { "SCRIPT_NAME" => "/foo", "PATH_INFO" => "/sprockets/omg" }
    assert_equal "/foo/sprockets -- /omg", response.body
  end

  def test_mounting_works_with_scope
    get "/its_a/sprocket/omg"
    assert_equal "/its_a/sprocket -- /omg", response.body
  end

  def test_mounting_with_shorthand
    get "/shorthand/omg"
    assert_equal "/shorthand -- /omg", response.body
  end

  def test_mounting_works_with_via
    get "/getfake"
    assert_equal "OK", response.body

    post "/getfake"
    assert_response :not_found
  end

  def test_with_fake_engine_does_not_call_invalid_method
    get "/fakeengine"
    assert_equal "OK", response.body
  end
end