diff --git a/railties/lib/rails/generators/test_unit/controller/templates/functional_test.rb b/railties/lib/rails/generators/test_unit/controller/templates/functional_test.rb
index 5a8a3ca5e0..62c7e2f011 100644
--- a/railties/lib/rails/generators/test_unit/controller/templates/functional_test.rb
+++ b/railties/lib/rails/generators/test_unit/controller/templates/functional_test.rb
@@ -1,7 +1,7 @@
 require 'test_helper'
 
 <% module_namespacing do -%>
-class <%= class_name %>ControllerTest < ActionController::TestCase
+class <%= class_name %>ControllerTest < ActionDispatch::IntegrationTest
 <% if mountable_engine? -%>
   setup do
     @routes = Engine.routes
@@ -15,7 +15,7 @@ class <%= class_name %>ControllerTest < ActionController::TestCase
 <% else -%>
 <% actions.each do |action| -%>
   test "should get <%= action %>" do
-    get :<%= action %>
+    get url_for(action: :<%= action %>)
     assert_response :success
   end
 
diff --git a/railties/lib/rails/generators/test_unit/scaffold/templates/api_functional_test.rb b/railties/lib/rails/generators/test_unit/scaffold/templates/api_functional_test.rb
index f302cd6c3d..412ecb8db1 100644
--- a/railties/lib/rails/generators/test_unit/scaffold/templates/api_functional_test.rb
+++ b/railties/lib/rails/generators/test_unit/scaffold/templates/api_functional_test.rb
@@ -1,7 +1,7 @@
 require 'test_helper'
 
 <% module_namespacing do -%>
-class <%= controller_class_name %>ControllerTest < ActionController::TestCase
+class <%= controller_class_name %>ControllerTest < ActionDispatch::IntegrationTest
   setup do
     @<%= singular_table_name %> = <%= fixture_name %>(:one)
 <% if mountable_engine? -%>
@@ -10,31 +10,31 @@ class <%= controller_class_name %>ControllerTest < ActionController::TestCase
   end
 
   test "should get index" do
-    get :index
+    get url_for( controller: :<%= controller_name %>, action: :index )
     assert_response :success
   end
 
   test "should create <%= singular_table_name %>" do
     assert_difference('<%= class_name %>.count') do
-      post :create, params: { <%= "#{singular_table_name}: { #{attributes_hash} }" %> }
+      post url_for( controller: :<%= controller_name %>, action: :create, <%= "#{singular_table_name}: { #{attributes_hash} }" %> )
     end
 
     assert_response 201
   end
 
   test "should show <%= singular_table_name %>" do
-    get :show, params: { id: <%= "@#{singular_table_name}" %> }
+    get url_for( controller: :<%= controller_name %>, action: :show, id: <%= "@#{singular_table_name}" %> )
     assert_response :success
   end
 
   test "should update <%= singular_table_name %>" do
-    patch :update, params: { id: <%= "@#{singular_table_name}" %>, <%= "#{singular_table_name}: { #{attributes_hash} }" %> }
+    patch url_for( controller: :<%= controller_name %>, action: :update, id: <%= "@#{singular_table_name}" %>, <%= "#{singular_table_name}: { #{attributes_hash} }" %> )
     assert_response 200
   end
 
   test "should destroy <%= singular_table_name %>" do
     assert_difference('<%= class_name %>.count', -1) do
-      delete :destroy, params: { id: <%= "@#{singular_table_name}" %> }
+      delete url_for( controller: :<%= controller_name %>, action: :destroy, id: <%= "@#{singular_table_name}" %> )
     end
 
     assert_response 204
diff --git a/railties/lib/rails/generators/test_unit/scaffold/templates/functional_test.rb b/railties/lib/rails/generators/test_unit/scaffold/templates/functional_test.rb
index 50b98b2631..3ac0b611ac 100644
--- a/railties/lib/rails/generators/test_unit/scaffold/templates/functional_test.rb
+++ b/railties/lib/rails/generators/test_unit/scaffold/templates/functional_test.rb
@@ -1,50 +1,51 @@
 require 'test_helper'
 
 <% module_namespacing do -%>
-class <%= controller_class_name %>ControllerTest < ActionController::TestCase
+class <%= controller_class_name %>ControllerTest < ActionDispatch::IntegrationTest
   setup do
     @<%= singular_table_name %> = <%= fixture_name %>(:one)
 <% if mountable_engine? -%>
+
     @routes = Engine.routes
 <% end -%>
   end
 
   test "should get index" do
-    get :index
+    get url_for( controller: :<%= controller_name %>, action: :index )
     assert_response :success
   end
 
   test "should get new" do
-    get :new
+    get url_for( controller: :<%= controller_name %>, action: :new )
     assert_response :success
   end
 
   test "should create <%= singular_table_name %>" do
     assert_difference('<%= class_name %>.count') do
-      post :create, params: { <%= "#{singular_table_name}: { #{attributes_hash} }" %> }
+      post url_for( controller: :<%= controller_name %>, action: :create, <%= "#{singular_table_name}: { #{attributes_hash} }" %> )
     end
 
     assert_redirected_to <%= singular_table_name %>_path(<%= class_name %>.last)
   end
 
   test "should show <%= singular_table_name %>" do
-    get :show, params: { id: <%= "@#{singular_table_name}" %> }
+    get url_for( controller: :<%= controller_name %>, action: :show, id: <%= "@#{singular_table_name}" %> )
     assert_response :success
   end
 
   test "should get edit" do
-    get :edit, params: { id: <%= "@#{singular_table_name}" %> }
+    get url_for( controller: :<%= controller_name %>, action: :edit, id: <%= "@#{singular_table_name}" %> )
     assert_response :success
   end
 
   test "should update <%= singular_table_name %>" do
-    patch :update, params: { id: <%= "@#{singular_table_name}" %>, <%= "#{singular_table_name}: { #{attributes_hash} }" %> }
+    patch url_for( controller: :<%= controller_name %>, action: :update, id: <%= "@#{singular_table_name}" %>, <%= "#{singular_table_name}: { #{attributes_hash} }" %> )
     assert_redirected_to <%= singular_table_name %>_path(<%= "@#{singular_table_name}" %>)
   end
 
   test "should destroy <%= singular_table_name %>" do
     assert_difference('<%= class_name %>.count', -1) do
-      delete :destroy, params: { id: <%= "@#{singular_table_name}" %> }
+      delete url_for( controller: :<%= controller_name %>, action: :destroy, id: <%= "@#{singular_table_name}" %>  )
     end
 
     assert_redirected_to <%= index_helper %>_path
diff --git a/railties/test/code_statistics_calculator_test.rb b/railties/test/code_statistics_calculator_test.rb
index cecc3908b3..73c8a6d14e 100644
--- a/railties/test/code_statistics_calculator_test.rb
+++ b/railties/test/code_statistics_calculator_test.rb
@@ -26,7 +26,7 @@ class CodeStatisticsCalculatorTest < ActiveSupport::TestCase
 
   test 'count number of methods in MiniTest file' do
     code = <<-RUBY
-      class FooTest < ActionController::TestCase
+      class FooTest < ActionDispatch::IntegrationTest
         test 'expectation' do
           assert true
         end
diff --git a/railties/test/generators/namespaced_generators_test.rb b/railties/test/generators/namespaced_generators_test.rb
index 590f06e19a..fd771186b6 100644
--- a/railties/test/generators/namespaced_generators_test.rb
+++ b/railties/test/generators/namespaced_generators_test.rb
@@ -218,7 +218,7 @@ class NamespacedScaffoldGeneratorTest < NamespacedGeneratorTestCase
                 /class ProductLinesController < ApplicationController/
 
     assert_file "test/controllers/test_app/product_lines_controller_test.rb",
-                /module TestApp\n  class ProductLinesControllerTest < ActionController::TestCase/
+                /module TestApp\n  class ProductLinesControllerTest < ActionDispatch::IntegrationTest/
 
     # Views
     %w(index edit new show _form).each do |view|
@@ -285,7 +285,7 @@ class NamespacedScaffoldGeneratorTest < NamespacedGeneratorTestCase
     end
 
     assert_file "test/controllers/test_app/admin/roles_controller_test.rb",
-                /module TestApp\n  class Admin::RolesControllerTest < ActionController::TestCase/
+                /module TestApp\n  class Admin::RolesControllerTest < ActionDispatch::IntegrationTest/
 
     # Views
     %w(index edit new show _form).each do |view|
@@ -352,7 +352,7 @@ class NamespacedScaffoldGeneratorTest < NamespacedGeneratorTestCase
     end
 
     assert_file "test/controllers/test_app/admin/user/special/roles_controller_test.rb",
-                /module TestApp\n  class Admin::User::Special::RolesControllerTest < ActionController::TestCase/
+                /module TestApp\n  class Admin::User::Special::RolesControllerTest < ActionDispatch::IntegrationTest/
 
     # Views
     %w(index edit new show _form).each do |view|
@@ -418,6 +418,6 @@ class NamespacedScaffoldGeneratorTest < NamespacedGeneratorTestCase
       assert_match(%r(require_dependency "test_app/application_controller"), content)
     end
     assert_file "test/controllers/test_app/admin/roles_controller_test.rb",
-                /module TestApp\n  class Admin::RolesControllerTest < ActionController::TestCase/
+                /module TestApp\n  class Admin::RolesControllerTest < ActionDispatch::IntegrationTest/
   end
 end
diff --git a/railties/test/generators/resource_generator_test.rb b/railties/test/generators/resource_generator_test.rb
index 581d80d60e..addaf83bc8 100644
--- a/railties/test/generators/resource_generator_test.rb
+++ b/railties/test/generators/resource_generator_test.rb
@@ -33,7 +33,7 @@ class ResourceGeneratorTest < Rails::Generators::TestCase
   def test_resource_controller_with_pluralized_class_name
     run_generator
     assert_file "app/controllers/accounts_controller.rb", /class AccountsController < ApplicationController/
-    assert_file "test/controllers/accounts_controller_test.rb", /class AccountsControllerTest < ActionController::TestCase/
+    assert_file "test/controllers/accounts_controller_test.rb", /class AccountsControllerTest < ActionDispatch::IntegrationTest/
 
     assert_file "app/helpers/accounts_helper.rb", /module AccountsHelper/
   end
diff --git a/railties/test/generators/scaffold_controller_generator_test.rb b/railties/test/generators/scaffold_controller_generator_test.rb
index b4ba101017..27bc356b10 100644
--- a/railties/test/generators/scaffold_controller_generator_test.rb
+++ b/railties/test/generators/scaffold_controller_generator_test.rb
@@ -104,7 +104,7 @@ class ScaffoldControllerGeneratorTest < Rails::Generators::TestCase
     run_generator ["User", "name:string", "age:integer", "organization:references{polymorphic}"]
 
     assert_file "test/controllers/users_controller_test.rb" do |content|
-      assert_match(/class UsersControllerTest < ActionController::TestCase/, content)
+      assert_match(/class UsersControllerTest < ActionDispatch::IntegrationTest/, content)
       assert_match(/test "should get index"/, content)
       assert_match(/post :create, params: \{ user: \{ age: @user\.age, name: @user\.name, organization_id: @user\.organization_id, organization_type: @user\.organization_type \} \}/, content)
       assert_match(/patch :update, params: \{ id: @user, user: \{ age: @user\.age, name: @user\.name, organization_id: @user\.organization_id, organization_type: @user\.organization_type \} \}/, content)
@@ -115,7 +115,7 @@ class ScaffoldControllerGeneratorTest < Rails::Generators::TestCase
     run_generator ["User"]
 
     assert_file "test/controllers/users_controller_test.rb" do |content|
-      assert_match(/class UsersControllerTest < ActionController::TestCase/, content)
+      assert_match(/class UsersControllerTest < ActionDispatch::IntegrationTest/, content)
       assert_match(/test "should get index"/, content)
       assert_match(/post :create, params: \{ user: \{  \} \}/, content)
       assert_match(/patch :update, params: \{ id: @user, user: \{  \} \}/, content)
@@ -236,7 +236,7 @@ class ScaffoldControllerGeneratorTest < Rails::Generators::TestCase
     run_generator ["User", "name:string", "age:integer", "organization:references{polymorphic}", "--api"]
 
     assert_file "test/controllers/users_controller_test.rb" do |content|
-      assert_match(/class UsersControllerTest < ActionController::TestCase/, content)
+      assert_match(/class UsersControllerTest < ActionDispatch::IntegrationTest/, content)
       assert_match(/test "should get index"/, content)
       assert_match(/post :create, params: \{ user: \{ age: @user\.age, name: @user\.name, organization_id: @user\.organization_id, organization_type: @user\.organization_type \} \}/, content)
       assert_match(/patch :update, params: \{ id: @user, user: \{ age: @user\.age, name: @user\.name, organization_id: @user\.organization_id, organization_type: @user\.organization_type \} \}/, content)
diff --git a/railties/test/generators/scaffold_generator_test.rb b/railties/test/generators/scaffold_generator_test.rb
index 0c3808a9a0..4e9b8c9332 100644
--- a/railties/test/generators/scaffold_generator_test.rb
+++ b/railties/test/generators/scaffold_generator_test.rb
@@ -57,7 +57,7 @@ class ScaffoldGeneratorTest < Rails::Generators::TestCase
     end
 
     assert_file "test/controllers/product_lines_controller_test.rb" do |test|
-      assert_match(/class ProductLinesControllerTest < ActionController::TestCase/, test)
+      assert_match(/class ProductLinesControllerTest < ActionDispatch::IntegrationTest/, test)
       assert_match(/post :create, params: \{ product_line: \{ product_id: @product_line\.product_id, title: @product_line\.title, user_id: @product_line\.user_id \} \}/, test)
       assert_match(/patch :update, params: \{ id: @product_line, product_line: \{ product_id: @product_line\.product_id, title: @product_line\.title, user_id: @product_line\.user_id \} \}/, test)
     end
@@ -135,7 +135,7 @@ class ScaffoldGeneratorTest < Rails::Generators::TestCase
     end
 
     assert_file "test/controllers/product_lines_controller_test.rb" do |test|
-      assert_match(/class ProductLinesControllerTest < ActionController::TestCase/, test)
+      assert_match(/class ProductLinesControllerTest < ActionDispatch::IntegrationTest/, test)
       assert_match(/post :create, params: \{ product_line: \{ product_id: @product_line\.product_id, title: @product_line\.title, user_id: @product_line\.user_id \} \}/, test)
       assert_match(/patch :update, params: \{ id: @product_line, product_line: \{ product_id: @product_line\.product_id, title: @product_line\.title, user_id: @product_line\.user_id \} \}/, test)
       assert_no_match(/assert_redirected_to/, test)
@@ -161,7 +161,7 @@ class ScaffoldGeneratorTest < Rails::Generators::TestCase
     run_generator ["product_line"]
 
     assert_file "test/controllers/product_lines_controller_test.rb" do |content|
-      assert_match(/class ProductLinesControllerTest < ActionController::TestCase/, content)
+      assert_match(/class ProductLinesControllerTest < ActionDispatch::IntegrationTest/, content)
       assert_match(/test "should get index"/, content)
       assert_match(/post :create, params: \{ product_line: \{  \} \}/, content)
       assert_match(/patch :update, params: \{ id: @product_line, product_line: \{  \} \}/, content)
@@ -250,7 +250,7 @@ class ScaffoldGeneratorTest < Rails::Generators::TestCase
     end
 
     assert_file "test/controllers/admin/roles_controller_test.rb",
-                /class Admin::RolesControllerTest < ActionController::TestCase/
+                /class Admin::RolesControllerTest < ActionDispatch::IntegrationTest/
 
     # Views
     %w(index edit new show _form).each do |view|
diff --git a/railties/test/rails_info_controller_test.rb b/railties/test/rails_info_controller_test.rb
index c51503c2b7..82b9633985 100644
--- a/railties/test/rails_info_controller_test.rb
+++ b/railties/test/rails_info_controller_test.rb
@@ -6,7 +6,7 @@ module ActionController
   end
 end
 
-class InfoControllerTest < ActionController::TestCase
+class InfoControllerTest < ActionDispatch::IntegrationTest
   tests Rails::InfoController
 
   def setup