aboutsummaryrefslogtreecommitdiffstats
path: root/actionpack/lib/action_dispatch/testing/integration.rb
blob: 265459f79ef36ec89d35578d88303723645cc6d4 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
require "stringio"
require "uri"
require "active_support/core_ext/kernel/singleton_class"
require "active_support/core_ext/object/try"
require "active_support/core_ext/string/strip"
require "rack/test"
require "minitest"

require "action_dispatch/testing/request_encoder"

module ActionDispatch
  module Integration #:nodoc:
    module RequestHelpers
      # Performs a GET request with the given parameters.
      #
      # - +path+: The URI (as a String) on which you want to perform a GET
      #   request.
      # - +params+: The HTTP parameters that you want to pass. This may
      #   be +nil+,
      #   a Hash, or a String that is appropriately encoded
      #   (<tt>application/x-www-form-urlencoded</tt> or
      #   <tt>multipart/form-data</tt>).
      # - +headers+: Additional headers to pass, as a Hash. The headers will be
      #   merged into the Rack env hash.
      # - +env+: Additional env to pass, as a Hash. The headers will be
      #   merged into the Rack env hash.
      #
      # This method returns a Response object, which one can use to
      # inspect the details of the response. Furthermore, if this method was
      # called from an ActionDispatch::IntegrationTest object, then that
      # object's <tt>@response</tt> instance variable will point to the same
      # response object.
      #
      # You can also perform POST, PATCH, PUT, DELETE, and HEAD requests with
      # +#post+, +#patch+, +#put+, +#delete+, and +#head+.
      #
      # Example:
      #
      #   get '/feed', params: { since: 201501011400 }
      #   post '/profile', headers: { "X-Test-Header" => "testvalue" }
      def get(path, *args)
        process_with_kwargs(:get, path, *args)
      end

      # Performs a POST request with the given parameters. See +#get+ for more
      # details.
      def post(path, *args)
        process_with_kwargs(:post, path, *args)
      end

      # Performs a PATCH request with the given parameters. See +#get+ for more
      # details.
      def patch(path, *args)
        process_with_kwargs(:patch, path, *args)
      end

      # Performs a PUT request with the given parameters. See +#get+ for more
      # details.
      def put(path, *args)
        process_with_kwargs(:put, path, *args)
      end

      # Performs a DELETE request with the given parameters. See +#get+ for
      # more details.
      def delete(path, *args)
        process_with_kwargs(:delete, path, *args)
      end

      # Performs a HEAD request with the given parameters. See +#get+ for more
      # details.
      def head(path, *args)
        process_with_kwargs(:head, path, *args)
      end

      # Performs an XMLHttpRequest request with the given parameters, mirroring
      # an AJAX request made from JavaScript.
      #
      # The request_method is +:get+, +:post+, +:patch+, +:put+, +:delete+ or
      # +:head+; the parameters are +nil+, a hash, or a url-encoded or multipart
      # string; the headers are a hash.
      #
      # Example:
      #
      #   xhr :get, '/feed', params: { since: 201501011400 }
      def xml_http_request(request_method, path, *args)
        if kwarg_request?(args)
          params, headers, env = args.first.values_at(:params, :headers, :env)
        else
          params = args[0]
          headers = args[1]
          env = {}

          if params.present? || headers.present?
            non_kwarg_request_warning
          end
        end

        ActiveSupport::Deprecation.warn(<<-MSG.strip_heredoc)
          xhr and xml_http_request methods are deprecated in favor of
          `get "/posts", xhr: true` and `post "/posts/1", xhr: true`.
        MSG

        process(request_method, path, params: params, headers: headers, xhr: true)
      end
      alias xhr :xml_http_request

      # Follow a single redirect response. If the last response was not a
      # redirect, an exception will be raised. Otherwise, the redirect is
      # performed on the location header.
      def follow_redirect!
        raise "not a redirect! #{status} #{status_message}" unless redirect?
        get(response.location)
        status
      end

      # Performs a request using the specified method, following any subsequent
      # redirect. Note that the redirects are followed until the response is
      # not a redirect--this means you may run into an infinite loop if your
      # redirect loops back to itself.
      #
      # Example:
      #
      #   request_via_redirect :post, '/welcome',
      #     params: { ref_id: 14 },
      #     headers: { "X-Test-Header" => "testvalue" }
      def request_via_redirect(http_method, path, *args)
        ActiveSupport::Deprecation.warn("`request_via_redirect` is deprecated and will be removed in Rails 5.1. Please use `follow_redirect!` manually after the request call for the same behavior.")
        process_with_kwargs(http_method, path, *args)

        follow_redirect! while redirect?
        status
      end

      # Performs a GET request, following any subsequent redirect.
      # See +request_via_redirect+ for more information.
      def get_via_redirect(path, *args)
        ActiveSupport::Deprecation.warn("`get_via_redirect` is deprecated and will be removed in Rails 5.1. Please use `follow_redirect!` manually after the request call for the same behavior.")
        request_via_redirect(:get, path, *args)
      end

      # Performs a POST request, following any subsequent redirect.
      # See +request_via_redirect+ for more information.
      def post_via_redirect(path, *args)
        ActiveSupport::Deprecation.warn("`post_via_redirect` is deprecated and will be removed in Rails 5.1. Please use `follow_redirect!` manually after the request call for the same behavior.")
        request_via_redirect(:post, path, *args)
      end

      # Performs a PATCH request, following any subsequent redirect.
      # See +request_via_redirect+ for more information.
      def patch_via_redirect(path, *args)
        ActiveSupport::Deprecation.warn("`patch_via_redirect` is deprecated and will be removed in Rails 5.1. Please use `follow_redirect!` manually after the request call for the same behavior.")
        request_via_redirect(:patch, path, *args)
      end

      # Performs a PUT request, following any subsequent redirect.
      # See +request_via_redirect+ for more information.
      def put_via_redirect(path, *args)
        ActiveSupport::Deprecation.warn("`put_via_redirect` is deprecated and will be removed in Rails 5.1. Please use `follow_redirect!` manually after the request call for the same behavior.")
        request_via_redirect(:put, path, *args)
      end

      # Performs a DELETE request, following any subsequent redirect.
      # See +request_via_redirect+ for more information.
      def delete_via_redirect(path, *args)
        ActiveSupport::Deprecation.warn("`delete_via_redirect` is deprecated and will be removed in Rails 5.1. Please use `follow_redirect!` manually after the request call for the same behavior.")
        request_via_redirect(:delete, path, *args)
      end
    end

    # An instance of this class represents a set of requests and responses
    # performed sequentially by a test process. Because you can instantiate
    # multiple sessions and run them side-by-side, you can also mimic (to some
    # limited extent) multiple simultaneous users interacting with your system.
    #
    # Typically, you will instantiate a new session using
    # IntegrationTest#open_session, rather than instantiating
    # Integration::Session directly.
    class Session
      DEFAULT_HOST = "www.example.com"

      include Minitest::Assertions
      include RequestHelpers, Assertions

      %w( status status_message headers body redirect? ).each do |method|
        delegate method, to: :response, allow_nil: true
      end

      %w( path ).each do |method|
        delegate method, to: :request, allow_nil: true
      end

      # The hostname used in the last request.
      def host
        @host || DEFAULT_HOST
      end
      attr_writer :host

      # The remote_addr used in the last request.
      attr_accessor :remote_addr

      # The Accept header to send.
      attr_accessor :accept

      # A map of the cookies returned by the last response, and which will be
      # sent with the next request.
      def cookies
        _mock_session.cookie_jar
      end

      # A reference to the controller instance used by the last request.
      attr_reader :controller

      # A reference to the request instance used by the last request.
      attr_reader :request

      # A reference to the response instance used by the last request.
      attr_reader :response

      # A running counter of the number of requests processed.
      attr_accessor :request_count

      include ActionDispatch::Routing::UrlFor

      # Create and initialize a new Session instance.
      def initialize(app)
        super()
        @app = app

        reset!
      end

      def url_options
        @url_options ||= default_url_options.dup.tap do |url_options|
          url_options.reverse_merge!(controller.url_options) if controller

          if @app.respond_to?(:routes)
            url_options.reverse_merge!(@app.routes.default_url_options)
          end

          url_options.reverse_merge!(host: host, protocol: https? ? "https" : "http")
        end
      end

      # Resets the instance. This can be used to reset the state information
      # in an existing session instance, so it can be used from a clean-slate
      # condition.
      #
      #   session.reset!
      def reset!
        @https = false
        @controller = @request = @response = nil
        @_mock_session = nil
        @request_count = 0
        @url_options = nil

        self.host        = DEFAULT_HOST
        self.remote_addr = "127.0.0.1"
        self.accept      = "text/xml,application/xml,application/xhtml+xml," +
                           "text/html;q=0.9,text/plain;q=0.8,image/png," +
                           "*/*;q=0.5"

        unless defined? @named_routes_configured
          # the helpers are made protected by default--we make them public for
          # easier access during testing and troubleshooting.
          @named_routes_configured = true
        end
      end

      # Specify whether or not the session should mimic a secure HTTPS request.
      #
      #   session.https!
      #   session.https!(false)
      def https!(flag = true)
        @https = flag
      end

      # Returns +true+ if the session is mimicking a secure HTTPS request.
      #
      #   if session.https?
      #     ...
      #   end
      def https?
        @https
      end

      # Set the host name to use in the next request.
      #
      #   session.host! "www.example.com"
      alias :host! :host=

      private
        def _mock_session
          @_mock_session ||= Rack::MockSession.new(@app, host)
        end

        def process_with_kwargs(http_method, path, *args)
          if kwarg_request?(args)
            process(http_method, path, *args)
          else
            non_kwarg_request_warning if args.any?
            process(http_method, path, params: args[0], headers: args[1])
          end
        end

        REQUEST_KWARGS = %i(params headers env xhr as)
        def kwarg_request?(args)
          args[0].respond_to?(:keys) && args[0].keys.any? { |k| REQUEST_KWARGS.include?(k) }
        end

        def non_kwarg_request_warning
          ActiveSupport::Deprecation.warn(<<-MSG.strip_heredoc)
            ActionDispatch::IntegrationTest HTTP request methods will accept only
            the following keyword arguments in future Rails versions:
            #{REQUEST_KWARGS.join(', ')}

            Examples:

            get '/profile',
              params: { id: 1 },
              headers: { 'X-Extra-Header' => '123' },
              env: { 'action_dispatch.custom' => 'custom' },
              xhr: true,
              as: :json
          MSG
        end

        # Performs the actual request.
        def process(method, path, params: nil, headers: nil, env: nil, xhr: false, as: nil)
          request_encoder = RequestEncoder.encoder(as)
          headers ||= {}

          if method == :get && as == :json && params
            headers["X-Http-Method-Override"] = "GET"
            method = :post
          end

          if path =~ %r{://}
            path = build_expanded_path(path, request_encoder) do |location|
              https! URI::HTTPS === location if location.scheme

              if url_host = location.host
                default = Rack::Request::DEFAULT_PORTS[location.scheme]
                url_host += ":#{location.port}" if default != location.port
                host! url_host
              end
            end
          elsif as
            path = build_expanded_path(path, request_encoder)
          end

          hostname, port = host.split(":")

          request_env = {
            :method => method,
            :params => request_encoder.encode_params(params),

            "SERVER_NAME"     => hostname,
            "SERVER_PORT"     => port || (https? ? "443" : "80"),
            "HTTPS"           => https? ? "on" : "off",
            "rack.url_scheme" => https? ? "https" : "http",

            "REQUEST_URI"    => path,
            "HTTP_HOST"      => host,
            "REMOTE_ADDR"    => remote_addr,
            "CONTENT_TYPE"   => request_encoder.content_type,
            "HTTP_ACCEPT"    => accept
          }

          wrapped_headers = Http::Headers.from_hash({})
          wrapped_headers.merge!(headers) if headers

          if xhr
            wrapped_headers["HTTP_X_REQUESTED_WITH"] = "XMLHttpRequest"
            wrapped_headers["HTTP_ACCEPT"] ||= [Mime[:js], Mime[:html], Mime[:xml], "text/xml", "*/*"].join(", ")
          end

          # this modifies the passed request_env directly
          if wrapped_headers.present?
            Http::Headers.from_hash(request_env).merge!(wrapped_headers)
          end
          if env.present?
            Http::Headers.from_hash(request_env).merge!(env)
          end

          session = Rack::Test::Session.new(_mock_session)

          # NOTE: rack-test v0.5 doesn't build a default uri correctly
          # Make sure requested path is always a full uri
          session.request(build_full_uri(path, request_env), request_env)

          @request_count += 1
          @request  = ActionDispatch::Request.new(session.last_request.env)
          response = _mock_session.last_response
          @response = ActionDispatch::TestResponse.from_response(response)
          @response.request = @request
          @html_document = nil
          @url_options = nil

          @controller = @request.controller_instance

          response.status
        end

        def build_full_uri(path, env)
          "#{env['rack.url_scheme']}://#{env['SERVER_NAME']}:#{env['SERVER_PORT']}#{path}"
        end

        def build_expanded_path(path, request_encoder)
          location = URI.parse(path)
          yield location if block_given?
          path = request_encoder.append_format_to location.path
          location.query ? "#{path}?#{location.query}" : path
        end
    end

    module Runner
      include ActionDispatch::Assertions

      APP_SESSIONS = {}

      attr_reader :app

      def initialize(*args, &blk)
        super(*args, &blk)
        @integration_session = nil
      end

      def before_setup # :nodoc:
        @app = nil
        super
      end

      def integration_session
        @integration_session ||= create_session(app)
      end

      # Reset the current session. This is useful for testing multiple sessions
      # in a single test case.
      def reset!
        @integration_session = create_session(app)
      end

      def create_session(app)
        klass = APP_SESSIONS[app] ||= Class.new(Integration::Session) {
          # If the app is a Rails app, make url_helpers available on the session
          # This makes app.url_for and app.foo_path available in the console
          if app.respond_to?(:routes)
            include app.routes.url_helpers
            include app.routes.mounted_helpers
          end
        }
        klass.new(app)
      end

      def remove! # :nodoc:
        @integration_session = nil
      end

      %w(get post patch put head delete cookies assigns
         xml_http_request xhr get_via_redirect post_via_redirect).each do |method|
        define_method(method) do |*args|
          # reset the html_document variable, except for cookies/assigns calls
          unless method == "cookies" || method == "assigns"
            @html_document = nil
          end

          integration_session.__send__(method, *args).tap do
            copy_session_variables!
          end
        end
      end

      # Open a new session instance. If a block is given, the new session is
      # yielded to the block before being returned.
      #
      #   session = open_session do |sess|
      #     sess.extend(CustomAssertions)
      #   end
      #
      # By default, a single session is automatically created for you, but you
      # can use this method to open multiple sessions that ought to be tested
      # simultaneously.
      def open_session
        dup.tap do |session|
          yield session if block_given?
        end
      end

      # Copy the instance variables from the current session instance into the
      # test instance.
      def copy_session_variables! #:nodoc:
        @controller = @integration_session.controller
        @response   = @integration_session.response
        @request    = @integration_session.request
      end

      def default_url_options
        integration_session.default_url_options
      end

      def default_url_options=(options)
        integration_session.default_url_options = options
      end

      def respond_to_missing?(method, include_private = false)
        integration_session.respond_to?(method, include_private) || super
      end

      # Delegate unhandled messages to the current session instance.
      def method_missing(sym, *args, &block)
        if integration_session.respond_to?(sym)
          integration_session.__send__(sym, *args, &block).tap do
            copy_session_variables!
          end
        else
          super
        end
      end
    end
  end

  # An integration test spans multiple controllers and actions,
  # tying them all together to ensure they work together as expected. It tests
  # more completely than either unit or functional tests do, exercising the
  # entire stack, from the dispatcher to the database.
  #
  # At its simplest, you simply extend <tt>IntegrationTest</tt> and write your tests
  # using the get/post methods:
  #
  #   require "test_helper"
  #
  #   class ExampleTest < ActionDispatch::IntegrationTest
  #     fixtures :people
  #
  #     def test_login
  #       # get the login page
  #       get "/login"
  #       assert_equal 200, status
  #
  #       # post the login and follow through to the home page
  #       post "/login", params: { username: people(:jamis).username,
  #         password: people(:jamis).password }
  #       follow_redirect!
  #       assert_equal 200, status
  #       assert_equal "/home", path
  #     end
  #   end
  #
  # However, you can also have multiple session instances open per test, and
  # even extend those instances with assertions and methods to create a very
  # powerful testing DSL that is specific for your application. You can even
  # reference any named routes you happen to have defined.
  #
  #   require "test_helper"
  #
  #   class AdvancedTest < ActionDispatch::IntegrationTest
  #     fixtures :people, :rooms
  #
  #     def test_login_and_speak
  #       jamis, david = login(:jamis), login(:david)
  #       room = rooms(:office)
  #
  #       jamis.enter(room)
  #       jamis.speak(room, "anybody home?")
  #
  #       david.enter(room)
  #       david.speak(room, "hello!")
  #     end
  #
  #     private
  #
  #       module CustomAssertions
  #         def enter(room)
  #           # reference a named route, for maximum internal consistency!
  #           get(room_url(id: room.id))
  #           assert(...)
  #           ...
  #         end
  #
  #         def speak(room, message)
  #           post "/say/#{room.id}", xhr: true, params: { message: message }
  #           assert(...)
  #           ...
  #         end
  #       end
  #
  #       def login(who)
  #         open_session do |sess|
  #           sess.extend(CustomAssertions)
  #           who = people(who)
  #           sess.post "/login", params: { username: who.username,
  #             password: who.password }
  #           assert(...)
  #         end
  #       end
  #   end
  #
  # Another longer example would be:
  #
  # A simple integration test that exercises multiple controllers:
  #
  #   require 'test_helper'
  #
  #   class UserFlowsTest < ActionDispatch::IntegrationTest
  #     test "login and browse site" do
  #       # login via https
  #       https!
  #       get "/login"
  #       assert_response :success
  #
  #       post "/login", params: { username: users(:david).username, password: users(:david).password }
  #       follow_redirect!
  #       assert_equal '/welcome', path
  #       assert_equal 'Welcome david!', flash[:notice]
  #
  #       https!(false)
  #       get "/articles/all"
  #       assert_response :success
  #       assert_select 'h1', 'Articles'
  #     end
  #   end
  #
  # As you can see the integration test involves multiple controllers and
  # exercises the entire stack from database to dispatcher. In addition you can
  # have multiple session instances open simultaneously in a test and extend
  # those instances with assertion methods to create a very powerful testing
  # DSL (domain-specific language) just for your application.
  #
  # Here's an example of multiple sessions and custom DSL in an integration test
  #
  #   require 'test_helper'
  #
  #   class UserFlowsTest < ActionDispatch::IntegrationTest
  #     test "login and browse site" do
  #       # User david logs in
  #       david = login(:david)
  #       # User guest logs in
  #       guest = login(:guest)
  #
  #       # Both are now available in different sessions
  #       assert_equal 'Welcome david!', david.flash[:notice]
  #       assert_equal 'Welcome guest!', guest.flash[:notice]
  #
  #       # User david can browse site
  #       david.browses_site
  #       # User guest can browse site as well
  #       guest.browses_site
  #
  #       # Continue with other assertions
  #     end
  #
  #     private
  #
  #       module CustomDsl
  #         def browses_site
  #           get "/products/all"
  #           assert_response :success
  #           assert_select 'h1', 'Products'
  #         end
  #       end
  #
  #       def login(user)
  #         open_session do |sess|
  #           sess.extend(CustomDsl)
  #           u = users(user)
  #           sess.https!
  #           sess.post "/login", params: { username: u.username, password: u.password }
  #           assert_equal '/welcome', sess.path
  #           sess.https!(false)
  #         end
  #       end
  #   end
  #
  # See the {request helpers documentation}[rdoc-ref:ActionDispatch::Integration::RequestHelpers] for help on how to
  # use +get+, etc.
  #
  # === Changing the request encoding
  #
  # You can also test your JSON API easily by setting what the request should
  # be encoded as:
  #
  #   require "test_helper"
  #
  #   class ApiTest < ActionDispatch::IntegrationTest
  #     test "creates articles" do
  #       assert_difference -> { Article.count } do
  #         post articles_path, params: { article: { title: "Ahoy!" } }, as: :json
  #       end
  #
  #       assert_response :success
  #       assert_equal({ id: Arcticle.last.id, title: "Ahoy!" }, response.parsed_body)
  #     end
  #   end
  #
  # The +as+ option sets the format to JSON, sets the content type to
  # "application/json" and encodes the parameters as JSON.
  #
  # Calling +parsed_body+ on the response parses the response body based on the
  # last response MIME type.
  #
  # For any custom MIME types you've registered, you can even add your own encoders with:
  #
  #   ActionDispatch::IntegrationTest.register_encoder :wibble,
  #     param_encoder: -> params { params.to_wibble },
  #     response_parser: -> body { body }
  #
  # Where +param_encoder+ defines how the params should be encoded and
  # +response_parser+ defines how the response body should be parsed through
  # +parsed_body+.
  #
  # Consult the Rails Testing Guide for more.

  class IntegrationTest < ActiveSupport::TestCase
    include TestProcess

    undef :assigns

    module UrlOptions
      extend ActiveSupport::Concern
      def url_options
        integration_session.url_options
      end
    end

    module Behavior
      extend ActiveSupport::Concern

      include Integration::Runner
      include ActionController::TemplateAssertions

      included do
        include ActionDispatch::Routing::UrlFor
        include UrlOptions # don't let UrlFor override the url_options method
        ActiveSupport.run_load_hooks(:action_dispatch_integration_test, self)
        @@app = nil
      end

      module ClassMethods
        def app
          if defined?(@@app) && @@app
            @@app
          else
            ActionDispatch.test_app
          end
        end

        def app=(app)
          @@app = app
        end

        def register_encoder(*args)
          RequestEncoder.register_encoder(*args)
        end
      end

      def app
        super || self.class.app
      end

      def document_root_element
        html_document.root
      end
    end

    include Behavior
  end
end