Remove ActionController::TestCase from documentation

In Rails 5.1 `ActionController::TestCase` will be moved out of Rails
into it's own gem.

Please use `ActionDispatch::IntegrationTest` going foward.

Because this will be moved to a gem I used `# :stopdoc:` instead of
deleting the documentation. This will remove it from the Rails
documentation but still leave the method documented for when we move it
to a gem.

Guides have been updated to use the routing structure used in Integration
and all test examples have been updated to inherit from
`ActionDispatch::IntegrationTest` instead of `ActionController::TestCase.

Fixes #22496

3 files changed, 34 insertions, 34 deletions

diff --git a/guides/source/active_support_core_extensions.md b/guides/source/active_support_core_extensions.md
index 181dca4b71..06c5476d45 100644
--- a/guides/source/active_support_core_extensions.md
+++ b/guides/source/active_support_core_extensions.md
@@ -517,17 +517,17 @@ Extensions to `Module`
 
 Using plain Ruby you can wrap methods with other methods, that's called _alias chaining_.
 
-For example, let's say you'd like params to be strings in functional tests, as they are in real requests, but still want the convenience of assigning integers and other kind of values. To accomplish that you could wrap `ActionController::TestCase#process` this way in `test/test_helper.rb`:
+For example, let's say you'd like params to be strings in functional tests, as they are in real requests, but still want the convenience of assigning integers and other kind of values. To accomplish that you could wrap `ActionDispatch::IntegrationTest#process` this way in `test/test_helper.rb`:
 
 ```ruby
-ActionController::TestCase.class_eval do
+ActionDispatch::IntegrationTest.class_eval do
   # save a reference to the original process method
   alias_method :original_process, :process
 
   # now redefine process and delegate to original_process
-  def process(action, params=nil, session=nil, flash=nil, http_method='GET')
+  def process('GET', path, params: nil, headers: nil, env: nil, xhr: false)
     params = Hash[*params.map {|k, v| [k, v.to_s]}.flatten]
-    original_process(action, params, session, flash, http_method)
+    original_process('GET', path, params: params)
   end
 end
 ```
@@ -537,10 +537,10 @@ That's the method `get`, `post`, etc., delegate the work to.
 That technique has a risk, it could be the case that `:original_process` was taken. To try to avoid collisions people choose some label that characterizes what the chaining is about:
 
 ```ruby
-ActionController::TestCase.class_eval do
+ActionDispatch::IntegrationTest.class_eval do
   def process_with_stringified_params(...)
     params = Hash[*params.map {|k, v| [k, v.to_s]}.flatten]
-    process_without_stringified_params(action, params, session, flash, http_method)
+    process_without_stringified_params(method, path, params: params)
   end
   alias_method :process_without_stringified_params, :process
   alias_method :process, :process_with_stringified_params
@@ -550,10 +550,10 @@ end
 The method `alias_method_chain` provides a shortcut for that pattern:
 
 ```ruby
-ActionController::TestCase.class_eval do
+ActionDispatch::IntegrationTest.class_eval do
   def process_with_stringified_params(...)
     params = Hash[*params.map {|k, v| [k, v.to_s]}.flatten]
-    process_without_stringified_params(action, params, session, flash, http_method)
+    process_without_stringified_params(method, path, params: params)
   end
   alias_method_chain :process, :stringified_params
 end
diff --git a/guides/source/engines.md b/guides/source/engines.md
index 359796b1ff..a50ef9a95f 100644
--- a/guides/source/engines.md
+++ b/guides/source/engines.md
@@ -1033,9 +1033,9 @@ typical `GET` to a controller in a controller's functional test like this:
 
 ```ruby
 module Blorgh
-  class FooControllerTest < ActionController::TestCase
+  class FooControllerTest < ActionDispatch::IntegrationTest
     def test_index
-      get :index
+      get foos_url
       ...
     end
   end
@@ -1049,13 +1049,13 @@ in your setup code:
 
 ```ruby
 module Blorgh
-  class FooControllerTest < ActionController::TestCase
+  class FooControllerTest < ActionDispatch::IntegrationTest
     setup do
       @routes = Engine.routes
     end
 
     def test_index
-      get :index
+      get foos_url
       ...
     end
   end
diff --git a/guides/source/testing.md b/guides/source/testing.md
index 3bfbf4f7ff..d09c0ae464 100644
--- a/guides/source/testing.md
+++ b/guides/source/testing.md
@@ -330,7 +330,6 @@ You'll see the usage of some of these assertions in the next chapter.
 All the basic assertions such as `assert_equal` defined in `Minitest::Assertions` are also available in the classes we use in our own test cases. In fact, Rails provides the following classes for you to inherit from:
 
 * `ActiveSupport::TestCase`
-* `ActionController::TestCase`
 * `ActionMailer::TestCase`
 * `ActionView::TestCase`
 * `ActionDispatch::IntegrationTest`
@@ -682,9 +681,9 @@ Let me take you through one such test, `test_should_get_index` from the file `ar
 
 ```ruby
 # articles_controller_test.rb
-class ArticlesControllerTest < ActionController::TestCase
+class ArticlesControllerTest < ActionDispatch::IntegrationTest
   test "should get index" do
-    get :index
+    get '/articles'
     assert_response :success
     assert_includes @response.body, 'Articles'
   end
@@ -697,7 +696,7 @@ and also ensuring that the right response body has been generated.
 The `get` method kicks off the web request and populates the results into the response. It accepts 4 arguments:
 
 * The action of the controller you are requesting.
-  This can be in the form of a string or a symbol.
+  This can be in the form of a string or a route (i.e. `articles_url`).
 
 * `params`: option with a hash of request parameters to pass into the action
   (e.g. query string parameters or article variables).
@@ -717,7 +716,7 @@ get(:show, params: { id: 12 }, session: { user_id: 5 })
 Another example: Calling the `:view` action, passing an `id` of 12 as the `params`, this time with no session, but with a flash message.
 
 ```ruby
-get(:view, params: { id: 12 }, flash: { message: 'booya!' })
+get(view_url, params: { id: 12 }, flash: { message: 'booya!' })
 ```
 
 NOTE: If you try running `test_should_create_article` test from `articles_controller_test.rb` it will fail on account of the newly added model level validation and rightly so.
@@ -727,7 +726,7 @@ Let us modify `test_should_create_article` test in `articles_controller_test.rb`
 ```ruby
 test "should create article" do
   assert_difference('Article.count') do
-    post :create, params: { article: { title: 'Some title' } }
+    post '/article', params: { article: { title: 'Some title' } }
   end
 
   assert_redirected_to article_path(Article.last)
@@ -758,7 +757,8 @@ To test AJAX requests, you can specify the `xhr: true` option to `get`, `post`,
 
 ```ruby
 test "ajax request" do
-  get :show, params: { id: articles(:first).id }, xhr: true
+  article = articules(:first)
+  get article_url(article), xhr: true
 
   assert_equal 'hello world', @response.body
   assert_equal "text/javascript", @response.content_type
@@ -799,11 +799,11 @@ can be set directly on the `@request` instance variable:
 ```ruby
 # setting a HTTP Header
 @request.headers["Accept"] = "text/plain, text/html"
-get :index # simulate the request with custom header
+get articles_url # simulate the request with custom header
 
 # setting a CGI variable
 @request.headers["HTTP_REFERER"] = "http://example.com/home"
-post :create # simulate the request with custom env variable
+post article_url # simulate the request with custom env variable
 ```
 
 ### Testing `flash` notices
@@ -818,7 +818,7 @@ Let's start by adding this assertion to our `test_should_create_article` test:
 ```ruby
 test "should create article" do
   assert_difference('Article.count') do
-    post :create, params: { article: { title: 'Some title' } }
+    post article_url, params: { article: { title: 'Some title' } }
   end
 
   assert_redirected_to article_path(Article.last)
@@ -888,7 +888,7 @@ Let's write a test for the `:show` action:
 ```ruby
 test "should show article" do
   article = articles(:one)
-  get :show, params: { id: article.id }
+  get '/article', params: { id: article.id }
   assert_response :success
 end
 ```
@@ -901,7 +901,7 @@ How about deleting an existing Article?
 test "should destroy article" do
   article = articles(:one)
   assert_difference('Article.count', -1) do
-    delete :destroy, params: { id: article.id }
+    delete article_url(article)
   end
 
   assert_redirected_to articles_path
@@ -913,7 +913,7 @@ We can also add a test for updating an existing Article.
 ```ruby
 test "should update article" do
   article = articles(:one)
-  patch :update, params: { id: article.id, article: { title: "updated" } }
+  patch '/article', params: { id: article.id, article: { title: "updated" } }
   assert_redirected_to article_path(article)
 end
 ```
@@ -925,7 +925,7 @@ Our test should now look something like this, disregard the other tests we're le
 ```ruby
 require 'test_helper'
 
-class ArticlesControllerTest < ActionController::TestCase
+class ArticlesControllerTest < ActionDispatch::IntegrationTest
   # called before every single test
   setup do
     @article = articles(:one)
@@ -939,20 +939,20 @@ class ArticlesControllerTest < ActionController::TestCase
 
   test "should show article" do
     # Reuse the @article instance variable from setup
-    get :show, params: { id: @article.id }
+    get article_url(@article)
     assert_response :success
   end
 
   test "should destroy article" do
     assert_difference('Article.count', -1) do
-      delete :destroy, params: { id: @article.id }
+      delete article_url(@article)
     end
 
     assert_redirected_to articles_path
   end
 
   test "should update article" do
-    patch :update, params: { id: @article.id, article: { title: "updated" } }
+    patch article_url(@article), params: { article: { title: "updated" } }
     assert_redirected_to article_path(@article)
   end
 end
@@ -974,7 +974,7 @@ module SignInHelper
   end
 end
 
-class ActionController::TestCase
+class ActionDispatch::IntegrationTest
   include SignInHelper
 end
 ```
@@ -982,13 +982,13 @@ end
 ```ruby
 require 'test_helper'
 
-class ProfileControllerTest < ActionController::TestCase
+class ProfileControllerTest < ActionDispatch::IntegrationTest
 
   test "should show profile" do
     # helper is now reusable from any controller test case
     sign_in users(:david)
 
-    get :show
+    get profile_url
     assert_response :success
   end
 end
@@ -1186,10 +1186,10 @@ Functional testing for mailers involves more than just checking that the email b
 ```ruby
 require 'test_helper'
 
-class UserControllerTest < ActionController::TestCase
+class UserControllerTest < ActionDispatch::IntegrationTest
   test "invite friend" do
     assert_difference 'ActionMailer::Base.deliveries.size', +1 do
-      post :invite_friend, params: { email: 'friend@example.com' }
+      post invite_friend_url, params: { email: 'friend@example.com' }
     end
     invite_email = ActionMailer::Base.deliveries.last