Use new hooks to extend test cases classes

Whose hooks were added in
rails/rails@0510208
to fix load order issues.

Gemfile

@@ -1,2 +1,7 @@
 source 'https://rubygems.org'
 gemspec
+
+gem 'actionpack', github: 'rails/rails', branch: '5-0-stable'
+gem 'actionview', github: 'rails/rails', branch: '5-0-stable'
+gem 'activesupport', github: 'rails/rails', branch: '5-0-stable'
+gem 'railties', github: 'rails/rails', branch: '5-0-stable'

lib/rails/controller/testing.rb

@@ -7,17 +7,19 @@ module Rails
   module Controller
     module Testing
       def self.install
-        ActiveSupport.on_load(:action_controller) do
-          ActionController::TestCase.include Rails::Controller::Testing::TestProcess
-          ActionController::TestCase.include Rails::Controller::Testing::TemplateAssertions
+        ActiveSupport.on_load(:action_controller_test_case) do
+          include Rails::Controller::Testing::TestProcess
+          include Rails::Controller::Testing::TemplateAssertions
+        end
 
-          ActionDispatch::IntegrationTest.include Rails::Controller::Testing::TemplateAssertions
-          ActionDispatch::IntegrationTest.include Rails::Controller::Testing::Integration
-          ActionDispatch::IntegrationTest.include Rails::Controller::Testing::TestProcess
+        ActiveSupport.on_load(:action_dispatch_integration_test) do
+          include Rails::Controller::Testing::TemplateAssertions
+          include Rails::Controller::Testing::Integration
+          include Rails::Controller::Testing::TestProcess
         end
 
-        ActiveSupport.on_load(:action_view) do
-          ActionView::TestCase.include Rails::Controller::Testing::TemplateAssertions
+        ActiveSupport.on_load(:action_view_test_case) do
+          include Rails::Controller::Testing::TemplateAssertions
         end
       end
     end

rails-controller-testing.gemspec

@@ -18,8 +18,8 @@ Gem::Specification.new do |s|
 
   s.required_ruby_version = '>= 2.2.2'
 
-  s.add_dependency "actionpack", "~> 5.x"
-  s.add_dependency "actionview", "~> 5.x"
+  s.add_dependency "actionpack", "~> 5.x" # TODO: require 5.0.1 to get the test case hook
+  s.add_dependency "actionview", "~> 5.x" # TODO: require 5.0.1 to get the test case hook
   s.add_dependency "activesupport", "~> 5.x"
 
   s.add_development_dependency "railties", "~> 5.x"