Use short-form for the scaffold render calls and drop the needless test

railties/lib/rails/generators/rails/scaffold_controller/templates/controller.rb

@@ -31,7 +31,7 @@ def create
     if @<%= orm_instance.save %>
       redirect_to @<%= singular_table_name %>, notice: <%= "'#{human_name} was successfully created.'" %>
     else
-      render action: 'new'
+      render :new
     end
   end
 
@@ -40,7 +40,7 @@ def update
     if @<%= orm_instance.update("#{singular_table_name}_params") %>
       redirect_to @<%= singular_table_name %>, notice: <%= "'#{human_name} was successfully updated.'" %>
     else
-      render action: 'edit'
+      render :edit
     end
   end
 

railties/test/generators/scaffold_controller_generator_test.rb

@@ -160,13 +160,6 @@ def self.all(klass)
     Unknown::Generators.send :remove_const, :ActiveModel
   end
 
-  def test_new_hash_style
-    run_generator
-    assert_file "app/controllers/users_controller.rb" do |content|
-      assert_match(/render action: 'new'/, content)
-    end
-  end
-
   def test_model_name_option
     run_generator ["Admin::User", "--model-name=User"]
     assert_file "app/controllers/admin/users_controller.rb" do |content|