#18 Add sql index for unpublished exercises

And remove spec for remove feature

spec/features/request_for_comments_filter_spec.rb

@@ -0,0 +1,32 @@
+require 'rails_helper'
+
+describe 'Request_for_Comments' do
+  let(:exercise) { FactoryBot.create(:audio_video, description: Forgery(:lorem_ipsum).sentence) }
+  let(:user) { FactoryBot.create(:teacher) }
+
+  before do
+    visit(sign_in_path)
+    fill_in('email', with: user.email)
+    fill_in('password', with: FactoryBot.attributes_for(:teacher)[:password])
+    click_button(I18n.t('sessions.new.link'))
+  end
+
+  it 'does not contain rfcs for unpublished exercises' do
+    unpublished_rfc = FactoryBot.create(:rfc)
+    unpublished_rfc.exercise.update(title: 'Unpublished Exercise')
+    unpublished_rfc.exercise.update(unpublished: true)
+    rfc = FactoryBot.create(:rfc)
+    rfc.exercise.update(title: 'Normal Exercise')
+    rfc.exercise.update(unpublished: false)
+
+    visit(request_for_comments_path)
+
+    expect(page).to have_content(rfc.exercise.title)
+    expect(page).not_to have_content(unpublished_rfc.exercise.title)
+  end
+
+  it 'contains a filter for study group in the view' do
+    visit(request_for_comments_path)
+    expect(page.find('#q_submission_study_group_id_in')).not_to be_nil
+  end
+end