Restructure TemplateAssertions-related code to eliminate circular requires.

Also, no need to include dependencies in AS::Concerns inside included blocks.

actionpack/lib/action_controller.rb

@@ -37,12 +37,13 @@ module ActionController
     autoload :UrlFor
   end
 
-  autoload :Integration,     'action_controller/deprecated/integration_test'
-  autoload :IntegrationTest, 'action_controller/deprecated/integration_test'
-  autoload :PerformanceTest, 'action_controller/deprecated/performance_test'
-  autoload :UrlWriter,       'action_controller/deprecated'
-  autoload :Routing,         'action_controller/deprecated'
-  autoload :TestCase,        'action_controller/test_case'
+  autoload :Integration,        'action_controller/deprecated/integration_test'
+  autoload :IntegrationTest,    'action_controller/deprecated/integration_test'
+  autoload :PerformanceTest,    'action_controller/deprecated/performance_test'
+  autoload :UrlWriter,          'action_controller/deprecated'
+  autoload :Routing,            'action_controller/deprecated'
+  autoload :TestCase,           'action_controller/test_case'
+  autoload :TemplateAssertions, 'action_controller/test_case'
 
   eager_autoload do
     autoload :RecordIdentifier

actionpack/lib/action_dispatch/testing/assertions.rb

@@ -8,12 +8,11 @@ module ActionDispatch
 
     extend ActiveSupport::Concern
 
-    included do
-      include DomAssertions
-      include ResponseAssertions
-      include RoutingAssertions
-      include SelectorAssertions
-      include TagAssertions
-    end
+    include DomAssertions
+    include ResponseAssertions
+    include RoutingAssertions
+    include SelectorAssertions
+    include TagAssertions
   end
 end
+

actionpack/lib/action_dispatch/testing/assertions/response.rb

@@ -6,13 +6,6 @@ module ActionDispatch
     module ResponseAssertions
       extend ActiveSupport::Concern
 
-      included do
-        # TODO: Need to pull in AV::Template monkey patches that track which
-        # templates are rendered. assert_template should probably be part
-        # of AV instead of AD.
-        require 'action_view/test_case'
-      end
-
       # Asserts that the response is one of the following types:
       #
       # * <tt>:success</tt>   - Status code was 200