Fix Rubocop offenses after Rubocop was reconfigured

app/controllers/concerns/submission_scoring.rb

@@ -49,14 +49,15 @@ module SubmissionScoring
 
   private :execute_test_file
 
-  def feedback_message(file, output)
-    # set_locale
+  def feedback_message(_file, output)
+    # TODO: why did we comment out set_locale and render_markdown?
+    set_locale
     if output[:score] == Assessor::MAXIMUM_SCORE && output[:file_role] == 'teacher_defined_test'
       I18n.t('exercises.implement.default_test_feedback')
     elsif output[:score] == Assessor::MAXIMUM_SCORE && output[:file_role] == 'teacher_defined_linter'
       I18n.t('exercises.implement.default_linter_feedback')
     else
-      # render_markdown(file.feedback_message)
+      render_markdown(file.feedback_message)
     end
   end
 

app/controllers/submissions_controller.rb

@@ -9,7 +9,7 @@ class SubmissionsController < ApplicationController
   include Tubesock::Hijack
 
   before_action :set_submission,
-    only: %i[download download_file render_file run score extract_errors show statistics test]
+    only: %i[download download_file render_file run score extract_errors show statistics]
   before_action :set_files, only: %i[download download_file render_file show run]
   before_action :set_file, only: %i[download_file render_file run]
   before_action :set_mime_type, only: %i[download_file render_file]
@@ -134,7 +134,7 @@ class SubmissionsController < ApplicationController
 
   def handle_websockets(tubesock, runner, socket)
     tubesock.send_data JSON.dump({'cmd' => 'status', 'status' => :container_running})
-    @output = String.new
+    @output = +''
 
     socket.on :output do |data|
       Rails.logger.info("#{Time.zone.now.getutc}: Container sending: #{data}")
@@ -239,9 +239,8 @@ class SubmissionsController < ApplicationController
   def score
     Thread.new do
       hijack do |tubesock|
-        if @embed_options[:disable_run]
-          return kill_socket(tubesock)
-        end
+        return kill_socket(tubesock) if @embed_options[:disable_run]
+
         tubesock.send_data(@submission.calculate_score)
         # To enable hints when scoring a submission, uncomment the next line:
         # send_hints(tubesock, StructuredError.where(submission: @submission))

app/models/runner.rb

@@ -22,7 +22,7 @@ class Runner < ApplicationRecord
 
     return runner if runner.save
 
-    raise(RunnerNotAvailableError, 'No runner available')
+    raise RunnerNotAvailableError.new('No runner available')
   end
 
   def copy_files(files)
@@ -33,7 +33,7 @@ class Runner < ApplicationRecord
 
     # runner has disappeared for some reason
     destroy
-    raise(RunnerNotAvailableError, 'Runner unavailable')
+    raise RunnerNotAvailableError.new('Runner unavailable')
   end
 
   def execute_command(command)
@@ -42,7 +42,7 @@ class Runner < ApplicationRecord
     if response.status == 404
       # runner has disappeared for some reason
       destroy
-      raise(RunnerNotAvailableError, 'Runner unavailable')
+      raise RunnerNotAvailableError.new('Runner unavailable')
     end
     parse response
   end

app/models/submission.rb

@@ -165,7 +165,7 @@ class Submission < ApplicationRecord
           container_execution_time: execution_time,
           status: exit_code.zero? ? :ok : :failed,
           stdout: stdout,
-          stderr: stderr
+          stderr: stderr,
         }
         test_result(output, file)
       end
@@ -210,7 +210,7 @@ class Submission < ApplicationRecord
     {
       class_name: File.basename(filename, File.extname(filename)).camelize,
       filename: filename,
-      module_name: File.basename(filename, File.extname(filename)).underscore
+      module_name: File.basename(filename, File.extname(filename)).underscore,
     }
   end
 end

db/migrate/20210519134938_create_runners.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class CreateRunners < ActiveRecord::Migration[6.1]
   def change
     create_table :runners do |t|