Use AS::Concern instead of Plain Old Ruby

test/functional/posts_controller_test.rb

@@ -1,49 +1,50 @@
 require 'test_helper'
+require 'active_support/concern'
 
 module PostsControllerBehavior
-  def self.included(controller)
-    controller.instance_eval do
-      test "should get index" do
-        get :index
-        assert_response :success
-        assert_not_nil assigns(:posts)
-      end
+  extend ActiveSupport::Concern
 
-      test "should get new" do
-        get :new
-        assert_response :success
-      end
+  included do
+    test "should get index" do
+      get :index
+      assert_response :success
+      assert_not_nil assigns(:posts)
+    end
 
-      test "should create post" do
-        assert_difference('Post.count') do
-          post :create, post: { body: @post.body, private: @post.private, title: @post.title }
-        end
+    test "should get new" do
+      get :new
+      assert_response :success
+    end
 
-        assert_redirected_to post_path(assigns(:post))
+    test "should create post" do
+      assert_difference('Post.count') do
+        post :create, post: { body: @post.body, private: @post.private, title: @post.title }
       end
 
-      test "should show post" do
-        get :show, id: @post
-        assert_response :success
-      end
+      assert_redirected_to post_path(assigns(:post))
+    end
 
-      test "should get edit" do
-        get :edit, id: @post
-        assert_response :success
-      end
+    test "should show post" do
+      get :show, id: @post
+      assert_response :success
+    end
 
-      test "should update post" do
-        put :update, id: @post, post: { body: @post.body, private: @post.private, title: @post.title }
-        assert_redirected_to post_path(assigns(:post))
-      end
+    test "should get edit" do
+      get :edit, id: @post
+      assert_response :success
+    end
 
-      test "should destroy post" do
-        assert_difference('Post.count', -1) do
-          delete :destroy, id: @post
-        end
+    test "should update post" do
+      put :update, id: @post, post: { body: @post.body, private: @post.private, title: @post.title }
+      assert_redirected_to post_path(assigns(:post))
+    end
 
-        assert_redirected_to posts_path
+    test "should destroy post" do
+      assert_difference('Post.count', -1) do
+        delete :destroy, id: @post
       end
+
+      assert_redirected_to posts_path
     end
   end
 end